Nabilkova A., Ismagilov A., Melnik M., Gushchin D., Zhukova M., Guselnikov M., Kozlov S., Tcypkin A.
2024-09-01 citations by CoLab: 1
Nabilkova A., Ismagilov A., Melnik M., Tcypkin A., Guselnikov M., Kalinichev A., Kozlov S., Zhang X.
Proceedings - Optica Nonlinear Optics Topical Meeting 2023, NLO 2023
2023-09-05 citations by CoLab: 0 Abstract  
This study experimentally confirms the vibrational nature of giant low-inertia nonlinearity in liquids in the THz range by obtaining temperature dependence of nonlinearity, which correlates with theoretical predictions considering temperature dependent parameters.
Nabilkova A., Ismagilov A., Melnik M., Tsypkin A., Guselnikov M., Kozlov S., Zhang X.
Optics Letters scimago Q1 wos Q2
2023-02-28 citations by CoLab: 5 Abstract  
To create self-controlled radiation photonics systems, it is necessary to have complete information about the nonlinear properties of the materials used. In this Letter, the vibrational mechanism of the giant low-inertia cubic nonlinearity of the refractive index of water in the terahertz (THz) frequency range is experimentally proven. Its dominance, which manifests itself when the temperature of the liquid changes, is demonstrated. The measured nonlinear refractive index in the THz frequency range for a water jet at temperatures from 14°C to 21°C demonstrates a correlation with the theoretical approach, varies in the range 4–10 × 10−10 cm2/W, and is characterized by an inertial time constant of less than 1 ps.
Shumigai V., Oparin E.N., Nabilkova A., Melnik M., Tcypkin A.N., Kozlov S.
2022-12-16 citations by CoLab: 1 Abstract  
The dependences of the refractive index of a congruent LiNbO3 crystal cut perpendicular to the x and z axes on the radiation frequency in the range of 0.25–1.25 THz are presented. These dependences are presented for different values of the crystal thickness - 0.52 mm, 1 mm and 2.21 mm. A comparative analysis of the obtained dispersion curves with the results from other works is presented. The comparison was carried out by estimating the dispersion broadening of a THz pulse with time in the process of simulating its propagation in a medium with a given dispersion. It is shown that a 1.5-cycle THz pulse is broadened in media with dispersions found in other works, which does not correspond to experimental data. In accordance with this, it was concluded that the dispersion curves for congruent LiNbO3 from the considered works do not agree with the real values of the refractive index in the THz frequency range.
Nabilkova A.O., Oparin E.N., Shumigay V., Melnik M.V., Tcypkin A.N.
It is known that such features of pulsed THz radiation as a small number of periods and an ultra-wide spectrum modify the appearance of linear effects like absorption, dispersion, and diffraction. In this work, we study the influence of the spatial localization of a THz pulse during its generation. It is shown that this leads to a spatial chirp of the pulse. Based on the results obtained, recommendations are formulated for working with such pulses, which make it possible to guarantee that spectral information will not be lost during the propagation of such pulses.
Shumigai V.S., Oparin E.N., Nabilkova A.O., Melnik M.V., Tcypkin A.N., Kozlov S.A.
Dispersion curves of the refraction index of a congruent lithium niobate (cLN) crystal cut perpendicular to the x and z axes in the terahertz frequency range are considered. In the study, the method of terahertz time domain spectroscopy with time resolution is used passed through an initially isotropic detecting crystal which becomes birefringent when exposed to a terahertz field. The magnitude of the induced birefringence is proportional to the amplitude of the terahertz field. Using Fourier analysis of a terahertz pulse passing through a cLN crystal and a reference pulse that does not interact with the object, the frequency dependences of the refractive index and the absorption coefficient of the object under study are constructed. Dispersion curves are presented for the real part of the refractive index of a cLN crystal cut along the planes (100) and (001), in the frequency range 0.25–1.25 THz. Simulation of the propagation of a one-and-a-half-cycle pulse in media with dispersion is performed based on the data of scientific papers by other authors. As a result, the temporal forms of the output signals are found. Conclusion about the inaccuracy of the dispersion curves from the selected works is made. The parameters has been identified whose optimization made it possible to eliminate inaccuracies in the display of the dispersion dependence for the high-frequency region of the terahertz spectrum were identified. The results obtained are very important for the design of devices based on nonlinear optical effects. These data will be useful for the generation of difference frequencies, optical rectification and generation of terahertz radiation as well as for areas where accurate data on the terahertz dispersion properties of nonlinear crystals, including cLN, are required.
Nabilkova A.O., Zhukova M.O., Melnik M.V., Ismagilov A.O., Chegnov V.P., Chegnova O.I., Tcypkin A.N.
2022-07-29 citations by CoLab: 3 Abstract  
Bulk zinc selenide crystals doped with different elements have been widely used for the laser emission in the middle IR frequency range. Here, we investigate the influence of iron and iron–neodymium volume and surface doping on the optical transmission properties of ZnSe crystals in the visible and NIR range (400–1000 nm) by the linear absorption spectroscopy and nonlinear femtosecond pump supercontinuum probe spectroscopy. We measure and calculate the linear optical transmission and absorption coefficient for different dopant concentrations. These results then used to analyze and model the induced nonlinear absorption pumped by 800 nm femtosecond pulses with the power up to 300 mW. To extract two-photon absorption coefficients, the common theoretical approach is modified for the case of high linear absorption. Our findings reveal that dopant concentration and type of surface-volume doping affect the linear and nonlinear absorption properties of Fe and Nd doped ZnSe crystals, but no direct dependence is found. At certain concentrations, the homogeneity and lattice of the crystal can be damaged causing defects arise and interaction between impurities, which strongly influence on the structure and properties of doped crystals. These results could enable the integration of such crystals into the field of NIR femtosecond optics and terahertz phonics as perspective components.
Nabilkova A.O., Melnik M.V., Zhukova M.O., Tsypkin A.N.
2022 International Conference Laser Optics, ICLO 2022 - Proceedingss
2022-06-20 citations by CoLab: 0 Abstract  
In this work the results of simulation of single- and multi-cycle pulse collimation are shown. Spatial and temporal field distribution of single-cycle pulse, which is typical for instance for THz radiation, were compared with the field distribution of multi-cycle pulse under the same conditions. Spatial chirp was observed for a single-cycle pulse - on-axis spectrum of the collimated single-cycle pulse is blue-shifted in comparison with the initial spectrum of the quasi-point source, whereas the off-axis spectrum is narrower and red-shifted.
Nabilkova A.O., Zhukova M.O., Melnik M.V., Tcypkin A.N., Kozlov S.A.
International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz
2021-08-29 citations by CoLab: 0 Abstract  
In this work the dispersion of nonlinear refractive index n2 (vibrational third-order nonlinear response) is estimated for various liquids used in THz photonics – water, ethanol, and isopropanol. To calculate n2 we use the theoretical model that considers known physical, linear and nonlinear optical parameters of liquids. The variation in n2 dispersion in the frequency range with nonresonant electronic contribution for water and ethanol is obtained to be around 15%, which seems to be very important to be considered for THz photonic devices’ design.
Zhukova M.O., Nabilkova A.O., Putilin S.E., Chegnov V.P., Chegnova O.I., Tcypkin A.N.
2019-12-01 citations by CoLab: 0 PDF Abstract  
Abstract We present the excited-state dynamics and optical properties of Fe- and Nd-diffusion doped zinc selenide polycrystals with different concentration measured by pump-probe spectroscopy in the visible and NIR range (400-1000 nm). The introduction of dopants allows one to control the optical properties of samples, which then can be used to create effective optoelectronic components for wide spectral ranges.
Kessi F.
2024-08-09 citations by CoLab: 2 Abstract   Cites 1
Laguerre-Gaussian beams possess a unique transverse mode structure defined by the orbital $$l$$ and radial $$m$$ mode numbers, offering promising potential for controlling nonlinear optical interactions. This comprehensive study aims to elucidate the crucial influence of this transverse mode structure on the nonlinear absorption processes. We first established a rigorous theoretical framework by deriving analytical expressions describing the behavior of the Open Z-scan normalized optical transmittance for an arbitrary nth-order nonlinear process under the weak nonlinearity approximation, accounting for the transmitted optical intensity, power, and their dependency on the beam’s transverse mode profile. In the numerical simulations, we focused on the specific case of second-order ( $$n=2$$ ) nonlinear absorption. Subsequently, detailed numerical simulations were employed to systematically analyze the intricate interplay between the $$l$$ and $$m$$ mode indices and their impact on the transmittance characteristics. By precisely varying these indices, we investigated how the observed transmission profiles were affected, revealing distinct behaviors for different Laguerre-Gaussian modes. When only $$m$$ increases, absorption decreases due to the wider transverse energy spread, while varying $$l$$ leads to a non-monotonic trend involving intense lobes. Remarkably, simultaneously increasing both $$l$$ and $$m$$ systematically enhances absorption through constructive interference of the helical and ring-like structures.
Lu Y., Huang Y., Cheng J., Ma R., Xu X., Zang Y., Wu Q., Xu J.
Nanophotonics scimago Q1 wos Q1 Open Access
2024-07-01 citations by CoLab: 5 PDF Abstract   Cites 1
Abstract Terahertz (THz) waves have exhibited promising prospects in 6G/7G communications, sensing, nondestructive detection, material modulation, and biomedical applications. With the development of high-power THz sources, more and more nonlinear optical effects at THz frequency and THz-induced nonlinear optical phenomena are investigated. These studies not only show a clear physics picture of electrons, ions, and molecules but also provide many novel applications in sensing, imaging, communications, and aerospace. Here, we review recent developments in THz nonlinear physics and THz-induced nonlinear optical phenomena. This review provides an overview and illustrates examples of how to achieve strong THz nonlinear phenomena and how to use THz waves to achieve nonlinear material modulation.
Novelli F.
Optics Express scimago Q1 wos Q2 Open Access
2024-03-12 citations by CoLab: 3 PDF Abstract   Cites 1
While bright terahertz sources are used to perform nonlinear experiments, they can be advantageous for high-precision linear measurements of opaque samples. By placing the sample away from the focus, nonlinearities can be suppressed, and sizeable amounts of transmitted radiation detected. Here, this approach is demonstrated for a 0.5 mm thick layer of liquid water in a static sample holder. Variations of the index of refraction as small as (7 ± 2) · 10−4 were detected at 0.58 THz for an aqueous salt solution containing ten millimoles of sodium chloride. To my knowledge, this precision is unprecedented in time-domain spectroscopy studies of diluted aqueous systems or other optically thick and opaque materials.
Ponnan S., Mangalassery S., Desai N.R., Naraharisetty S.R.
Journal of Optics (India) scimago Q3 wos Q3
2024-02-25 citations by CoLab: 1 Abstract   Cites 1
Understanding the transient absorption dynamics of IR-780 infrared dye is important since it is extensively used in in vivo imaging and phototherapy treatments. It is widely used in biomedical imaging and cancer therapy. Linear absorption spectra of this dye show a strong absorption around 780 nm and vibronic sidebands in higher energy side. For nondegenerate pump–probe studies, the IR-780 dye is excited with a 780-nm pump pulse and probed with a white light continuum to obtain a two-dimensional transient spectrum. We observe different types of signals, such as ground state bleach, stimulated emission, and excited state absorption (S1–Sn states), corresponding to different energy transitions and relaxation processes in the dye. Also, we perform open aperture Z-scan measurements to confirm that single-photon absorption is the dominant process of pump excitation. We observed the overall transient spectrum dynamics fitted for a double exponential decay process with time constants of 449 ps and 162 ps, associated with the excited state decay and bleach decay, respectively.
Debbal M., Ouadah M.C., Bouregaa M., Chikh-Bled H.
Abstract Liquid infiltration into photonic crystal fibers (PCFs) opens new horizons in optical fiber design. This innovation allows precise control of the refractive index, dispersion, and nonlinear effects within the PCF core, expanding its adaptability for various applications. Through numerical simulations, we explore the impact of different liquids on chromatic dispersion in PCFs, emphasizing the role of filling ratios. Our findings unveil shifts in zero dispersion wavelengths, with chloroform causing significant changes. Lower filling ratios reduce dispersion sensitivity, while higher ratios enable dispersion compensation. This study advances our understanding of liquid-filled PCFs, vital for cutting-edge photonics research and practical applications.
Nabilkova A., Ismagilov A., Melnik M., Tcypkin A., Guselnikov M., Kalinichev A., Kozlov S., Zhang X.
Proceedings - Optica Nonlinear Optics Topical Meeting 2023, NLO 2023
2023-09-05 citations by CoLab: 0 Abstract   Cites 1
This study experimentally confirms the vibrational nature of giant low-inertia nonlinearity in liquids in the THz range by obtaining temperature dependence of nonlinearity, which correlates with theoretical predictions considering temperature dependent parameters.
Novelli F.
Optics Express scimago Q1 wos Q2 Open Access
2024-03-12 citations by CoLab: 3 PDF Abstract  
While bright terahertz sources are used to perform nonlinear experiments, they can be advantageous for high-precision linear measurements of opaque samples. By placing the sample away from the focus, nonlinearities can be suppressed, and sizeable amounts of transmitted radiation detected. Here, this approach is demonstrated for a 0.5 mm thick layer of liquid water in a static sample holder. Variations of the index of refraction as small as (7 ± 2) · 10−4 were detected at 0.58 THz for an aqueous salt solution containing ten millimoles of sodium chloride. To my knowledge, this precision is unprecedented in time-domain spectroscopy studies of diluted aqueous systems or other optically thick and opaque materials.
Wu Q., Huang Y., Lu Y., Li W., Xu X., Jiang X., Ma R., Chen L., Ruan N., Xu J.
2023-12-12 citations by CoLab: 1 Abstract  
Abstract Optical Kerr effect, in which input light intensity linearly alters the refractive index, has enabled the generation of optical solitons, supercontinuum spectra, and frequency combs, playing vital roles in the on-chip devices, fiber communications, and quantum manipulations. Especially, terahertz Kerr effect, featuring fascinating prospects in future high-rate computing, artificial intelligence, and cloud-based technologies, encounters a great challenge due to the rather low power density and feeble Kerr response. Here, we demonstrate a giant terahertz frequency Kerr nonlinearity mediated by stimulated phonon polaritons. Under the influences of the giant Kerr nonlinearity, the power-dependent refractive index change would result in a frequency shift in the microcavity, which was experimentally demonstrated via the measurement of the resonant mode of a chip-scale lithium niobate Fabry-Pérot microcavity. Attributed to the existence of stimulated phonon polaritons, the nonlinear coefficient extracted from the frequency shifts are orders of magnitude larger than that of visible and infrared light, which is also theoretically demonstrated by nonlinear Huang equations. This work opens an avenue for many rich and fruitful terahertz Kerr effect based physical, chemical, and biological systems that have terahertz fingerprints.
Li Z., Song Y.
2023-09-29 citations by CoLab: 4 Abstract  
Chapter 4 Characterizing the Nonlinear Optical Properties of 2D Materials by Double 4f Nonlinear Imaging System with Phase Object and Four-Wave-Mixing Microscopy Zhongguo Li, Zhongguo Li Changshu Institute of Technology, School of Electronic and Information Engineering, Changshu, 215500 ChinaSearch for more papers by this authorYinglin Song, Yinglin Song Harbin Institute of Technology, Department of Physics, Harbin, 150001 ChinaSearch for more papers by this author Zhongguo Li, Zhongguo Li Changshu Institute of Technology, School of Electronic and Information Engineering, Changshu, 215500 ChinaSearch for more papers by this authorYinglin Song, Yinglin Song Harbin Institute of Technology, Department of Physics, Harbin, 150001 ChinaSearch for more papers by this author Book Editor(s):Qiang Wang, Qiang Wang Lanzhou University, No. 222 Tianshui South Road, Lanzhou, 730000 ChinaSearch for more papers by this authorHao-Li Zhang, Hao-Li Zhang Lanzhou University, No. 222 Tianshui South Road, Lanzhou, 730000 ChinaSearch for more papers by this author First published: 29 September 2023 https://doi.org/10.1002/9783527838288.ch4 AboutPDFPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShareShare a linkShare onEmailFacebookTwitterLinkedInRedditWechat Summary Two-dimensional (2D) materials have attracted considerable research attention in the past two decades due to their intriguing thermal, mechanical, and optical properties. A deeper understanding of the structure–property relationship of 2D material is essential for future development of functional devices. Characterizing the nonlinear optical (NLO) response of 2D materials is of great importance for material analysis and device engineering. In this chapter, we highlight the recent progress in the third-order NLO measurement methods of 2D materials, with a focus on results with microscopy. First, we summarize the principles of nonlinear optics and common NLO characterization methods in 2D material research. Second, we introduce the double 4f nonlinear imaging system with phase object (NIT-PO) method. The history and theoretical underpinnings of the technique are briefly discussed. Third, the four-wave-mixing microscopy method is described, and the recent experimental data are highlighted. Finally, we provide a perspective on the trends and challenges of NLO measurement technique for 2D material research. 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Zibod S., Rasekh P., Yildrim M., Cui W., Bhardwaj R., Ménard J., Boyd R.W., Dolgaleva K.
Advanced Optical Materials scimago Q1 wos Q1
2023-07-03 citations by CoLab: 8 Abstract  
AbstractThis study reports on the experimental observation of a very strong nonlinear response in crystalline quartz in the terahertz (THz) frequency region through THz time‐domain spectroscopy (THz‐TDS). A previously established theoretical model is modified and presented and predicts a Kerr coefficient n2 equal to 5.17 × 10−14 m2 W−1. The time‐domain analysis of the measured data shows that with increasing of the THz peak amplitude, the pulse experiences a larger time delay in the sample. As the THz amplitude increases to values higher than 110 kV cm−1, the growth rate of the delay decreases, indicating a saturation process. The value of the nonlinear refractive index calculated through the frequency‐response analysis is estimated to be on the order of 10−13 m2 W−1, which is several orders of magnitude larger than typical values of the nonlinear refractive index of solids in the visible region. Furthermore, a negative fifth‐order susceptibility on the order of 10−30 m4 V−4 is measured.
Hemmatian M.A., Jahangiri F.
Optical and Quantum Electronics scimago Q2 wos Q3
2023-02-28 citations by CoLab: 1 Abstract  
We develop a new analytical method for calculating the nonlinear refractive index and the two-photon absorption coefficient of centrosymmetric materials based on the classical anharmonic oscillator model. We calculate the nonlinear dispersion properties of pure bulk water over a broad frequency range from 0.5 to 750 THz. Our model could estimate pure water’s nonlinear properties, including the nonlinear refractive index and nonlinear absorption coefficient, with appropriate accuracy, consistent with the previous experimental and theoretical results, and through a more straightforward and less complicated approach.
Nabilkova A., Ismagilov A., Melnik M., Tsypkin A., Guselnikov M., Kozlov S., Zhang X.
Optics Letters scimago Q1 wos Q2
2023-02-28 citations by CoLab: 5 Abstract  
To create self-controlled radiation photonics systems, it is necessary to have complete information about the nonlinear properties of the materials used. In this Letter, the vibrational mechanism of the giant low-inertia cubic nonlinearity of the refractive index of water in the terahertz (THz) frequency range is experimentally proven. Its dominance, which manifests itself when the temperature of the liquid changes, is demonstrated. The measured nonlinear refractive index in the THz frequency range for a water jet at temperatures from 14°C to 21°C demonstrates a correlation with the theoretical approach, varies in the range 4–10 × 10−10 cm2/W, and is characterized by an inertial time constant of less than 1 ps.
Shumigai V., Oparin E.N., Nabilkova A., Melnik M., Tcypkin A.N., Kozlov S.
2022-12-16 citations by CoLab: 1 Abstract  
The dependences of the refractive index of a congruent LiNbO3 crystal cut perpendicular to the x and z axes on the radiation frequency in the range of 0.25–1.25 THz are presented. These dependences are presented for different values of the crystal thickness - 0.52 mm, 1 mm and 2.21 mm. A comparative analysis of the obtained dispersion curves with the results from other works is presented. The comparison was carried out by estimating the dispersion broadening of a THz pulse with time in the process of simulating its propagation in a medium with a given dispersion. It is shown that a 1.5-cycle THz pulse is broadened in media with dispersions found in other works, which does not correspond to experimental data. In accordance with this, it was concluded that the dispersion curves for congruent LiNbO3 from the considered works do not agree with the real values of the refractive index in the THz frequency range.
Nabilkova A.O., Zhukova M.O., Melnik M.V., Ismagilov A.O., Chegnov V.P., Chegnova O.I., Tcypkin A.N.
2022-07-29 citations by CoLab: 3 Abstract  
Bulk zinc selenide crystals doped with different elements have been widely used for the laser emission in the middle IR frequency range. Here, we investigate the influence of iron and iron–neodymium volume and surface doping on the optical transmission properties of ZnSe crystals in the visible and NIR range (400–1000 nm) by the linear absorption spectroscopy and nonlinear femtosecond pump supercontinuum probe spectroscopy. We measure and calculate the linear optical transmission and absorption coefficient for different dopant concentrations. These results then used to analyze and model the induced nonlinear absorption pumped by 800 nm femtosecond pulses with the power up to 300 mW. To extract two-photon absorption coefficients, the common theoretical approach is modified for the case of high linear absorption. Our findings reveal that dopant concentration and type of surface-volume doping affect the linear and nonlinear absorption properties of Fe and Nd doped ZnSe crystals, but no direct dependence is found. At certain concentrations, the homogeneity and lattice of the crystal can be damaged causing defects arise and interaction between impurities, which strongly influence on the structure and properties of doped crystals. These results could enable the integration of such crystals into the field of NIR femtosecond optics and terahertz phonics as perspective components.
Guselnikov M.S., Zhukova M.O., Kozlov S.A.
2022-07-01 citations by CoLab: 1 Abstract  
Subject of study. The inertia of the oscillatory mechanisms of the nonlinearities of isotropic dielectric media in the field of the terahertz-frequency electromagnetic waves was investigated for resonant and nonresonant interactions between radiation and matter. The purpose of this work was to construct a dynamic model of the nonlinear polarization responses of optical media with oscillatory nature in the field of terahertz pulses and to estimate the time constants characterizing the inertia of such responses during resonant and nonresonant interactions between radiation and media molecular vibrations. Method. The model of anharmonic vibrations of the atoms of each molecule as an oscillator in the general case for an isotropic medium, with both quadratic and cubic nonlinearities, was reduced for a macroscopic optical characteristic—its polarization—to a model as a system of parametrically coupled equations with only cubic nonlinearities. The system parameters were determined from well-known characteristics of a medium, such as its thermal expansion coefficient, stretching molecular vibration frequency, and refractive index. Main results. Expressions were obtained for the inertial time constants of the cubic susceptibilities of optical media with nonlinear vibrations in two- and one-photon resonant interactions with quasi-monochromatic terahertz pulses as well as in nonresonant interactions with broadband terahertz pulsed radiation through the thermal, spectral, and optical characteristics of materials known in the literature. Numerical estimates were obtained for the inertial time constants of the nonlinear susceptibilities of media with particularly high vibrational nonlinearities in the refractive indices, namely, α-pinene and water, as well as silicon dioxide. For these materials, the inertial time constants of the resonant oscillatory mechanisms of the nonlinearities for radiation in the terahertz spectral range were shown to be of the order of hundreds of femtoseconds; for the nonresonant interactions, the time constants decreased to ten femtoseconds or less. Practical significance. The obtained inertial time constant estimations of the polarization responses of materials indicate that their giant nonlinearities in the far infrared spectral range could be used to develop ultrafast photonic devices for pulsed terahertz radiation parameter control.
Artser I., Melnik M., Ismagilov A., Guselnikov M., Tcypkin A., Kozlov S.
Scientific Reports scimago Q1 wos Q1 Open Access
2022-05-30 citations by CoLab: 2 PDF Abstract  
AbstractHigh-intensity optical radiation propagation in a transparent dielectric medium causes the phenomena of pulse self-action and radiation generation at triple frequencies due to the cubic nonlinearity of the medium. However, quadratic nonlinear effects usually outshine the cubic ones in anisotropic nonlinear crystals. In this work, we demonstrate that for certain experimental parameters the nonlinear effect of the third order can be stronger than the second order one in the MgO:$$\hbox {LiNbO}_3$$ LiNbO 3 crystal for terahertz frequency range. We experimentally and theoretically show that this effect can lead to the significant modification of the classical phenomenon of radiation generation at triple frequencies in the case when the pulse represents only one complete oscillation of the optical field. The experiment demonstrated that the phenomenon of generation of radiation at triple frequencies with respect to the frequency of the maximum spectral density in a nonlinear medium of the pulse disappears, and it is replaced by the generation of radiation at quadruple frequencies. The analysis confirms that this effect is based on the asymmetry and large width of the initial spectrum of such extremely short pulses in terms of the number of oscillations.
Novelli F., Hoberg C., Adams E.M., Klopf J.M., Havenith M.
2022-01-01 citations by CoLab: 15 Abstract  
The dynamical complexity of the hydrogen-bonded water network can be investigated with intense Terahertz (THz) spectroscopy, which can drive the liquid into the nonlinear response regime and probe anharmonicity effects. Here we report single-color and polarization-dependent pump-probe experiments at 12.3 THz on liquid water, exciting the librational mode. By comparing results obtained on a static sample and a free-flowing water jet, we are able to disentangle the distinct contributions by thermal, acoustic, and nonlinear optical effects. We show that the transient transmission by the static water layer on a time scale of hundreds of microseconds can be described by thermal (slow) and acoustic (temperature-dependent) effects. In addition, during pump probe overlap we observe an anisotropic nonlinear optical response. This nonlinear signal is more prominent in the liquid jet than in the static cell, where temperature and density perturbations are more pronounced. Our measurements confirm that the THz excitation resonates with the rotationally-damped motion of water molecules, resulting in enhanced transient anisotropy. This model can be used to explain the non-linear response of water in the frequency range between about 1 and 20 THz.
Zeng H., Gong S., Wang L., Zhou T., Zhang Y., Lan F., Cong X., Wang L., Song T., Zhao Y., Yang Z., Mittleman D.M.
Nanophotonics scimago Q1 wos Q1 Open Access
2021-12-19 citations by CoLab: 41 PDF Abstract  
Abstract In the past ten years, terahertz technology has developed rapidly in wireless communications, spectroscopy, and imaging. Various functional devices have been developed, such as filters, absorbers, polarizers, mixers, and modulators. Among these, the terahertz phase modulation is a current research hotspot. It is the core technology to realize flexible control of the terahertz wavefront, beam scanning, focusing deflection. It is indispensable in terahertz wireless communication, high-resolution imaging, and radar systems. This review summarizes the research progress of terahertz phase modulators from the two major types: free space and guided wave integration. Among these, the free space terahertz phase modulator is realized by combining the tunable materials and artificial metasurfaces. Based on different types of tunable materials, the terahertz free space phase modulator combining the semiconductor, liquid crystal, phase change materials, graphene, and other two-dimensional materials are introduced, and the influence of different materials on the phase modulation performance is discussed and analyzed. The monolithic integration and waveguide embedding methods are introduced separately, and the characteristics of different forms of terahertz-guided wave phase modulation are also discussed. Finally, the development trends of terahertz phase modulators, possible new methods, and future application requirements are discussed.
Hine G.A., Doleans M.
Physical Review A scimago Q1 wos Q2
2021-09-30 citations by CoLab: 6 Abstract  
We present an analysis of spatial chirp in subcycle pulsed beams corroborated by spatiotemporal electro-optic sampling measurements of terahertz radiation. Modeling the subcycle pulsed beam as a superposition of monochromatic Gaussian beams, free-space propagation is shown to directly lead to lateral spatial chirp with the spectrum on-axis substantially bluer than the overall energy spectrum. The two-transverse $+$ one-temporal dimensional profile of terahertz subcycle pulsed beams from organic crystals DSTMS and OH1 are measured and compared with observed spatiospectral correlations consistent with the model.
Amini T., Jahangiri F.
Optics Express scimago Q1 wos Q2 Open Access
2021-09-27 citations by CoLab: 9 PDF Abstract  
A widely tunable regenerative terahertz parametric amplifier is proposed based on degenerate four-wave mixing in an asynchronously pumped highly nonlinear medium. To enhance the Kerr nonlinearity, a hybrid structure of cyclic olefin co/polymer (COC/P) TOPAS integrated by a graphene oxide film is utilized as the gain medium and embedded into a cavity. A low-power terahertz seed wave is injected inside the cavity and sequentially pumped by four asynchronous coupled beams of identical powers. Our results reveal that the output power, the tuning frequency range and the power conversion efficiency of terahertz waves could be considerably improved in the proposed design. Terahertz waves with maximum peak power of 641 W, the accumulated conversion efficiency of 3.8% and amplification gain of 320.5 are obtained at a frequency of 9.61 THz, which could be tuned over a range of 1.17 − 19.736 THz.
Total publications
12
Total citations
10
Citations per publication
0.83
Average publications per year
2
Average coauthors
5.17
Publications years
2019-2024 (6 years)
h-index
2
i10-index
0
m-index
0.33
o-index
3
g-index
3
w-index
0
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Top-100

Fields of science

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Atomic and Molecular Physics, and Optics, 3, 25%
General Physics and Astronomy, 2, 16.67%
General Engineering, 2, 16.67%
Electronic, Optical and Magnetic Materials, 1, 8.33%
Computer Science Applications, 1, 8.33%
Physics and Astronomy (miscellaneous), 1, 8.33%
Mechanical Engineering, 1, 8.33%
Computational Mathematics, 1, 8.33%
Information Systems, 1, 8.33%
Applied Mathematics, 1, 8.33%
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Russia, 7, 58.33%
Country not defined, 4, 33.33%
USA, 1, 8.33%
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Algeria, 2, 20%
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  • We do not take into account publications without a DOI.
  • Statistics recalculated daily.