Baryshev, Alexander Valeryevich

Kulikova D.P., Baburin A.S., Lotkov E.S., Rodionov I.A., Baryshev A.V.

Shelaev A.V., Kulikova D.P., Amiraslanov A.S., Baburin A.S., Rodionov I.A., Baryshev A.V.

Kharisova R., Babkina A., Zyryanova K., Kuzmenko N., Leonidova A., Valiev D., Stepanov S., Sgibnev Y., Shelaev A., Baryshev A.

In this work we successfully synthesize CsPb(BrxI1-x)3 perovskite nanocrystals with different Br/I ratio in a borogermanate glass matrix. The XRD studies show cubic perovskite phase peaks shift as the Br/I ratio changes. The formed nanocrystals have mean size of about 17 nm based on the calculations from the absorption spectra. The smooth change of the Br/I ratio in perovskite nanocrystals allow to obtain luminescence in the range 500 – 750 nm with quantum yield up to 35 %. The luminescence quantum yield and lifetime of the mixed-halide nanocrystals steadily increase with iodine concentration. Practical application of perovskite glass-ceramics as a radiation converter is shown in the paper.

Shurukhina A.V., Barinov D.S., Zharovov D.A., Rudakova A.V., Tananaev P.N., Yankovskiy G.M., Baryshev A.V., Emeline A.V., Ryabchuk V.K.

Subject of study. This study investigated a series of powdered NaYF4:Yb,Er samples with varying ytterbium-ion contents. Aim of study. This study aimed to determine the change in the quantum yield of upconversion luminescence exhibited by NaYF4:Yb,Er as a function of the ytterbium-ion content and intensity of excitation by laser irradiation at a wavelength of 975 nm. Method. The quantum yield of upconversion luminescence was determined using a spectrometer and an integrating sphere. Main results. The quantum yield of upconversion luminescence was measured for a series of powdered NaYF4:Yb,Er samples with different ytterbium-ion contents. The optimal ytterbium-ion content, corresponding to the maximum efficiency of upconversion, was found to be 0.4 at%. Practical significance. The results obtained can be applied in optoelectronics, medicine, and the development of laser facilities.

Kolomiytsev A.S., Kotosonova A.V., Il’in O.I., Saenko A.V., Shelaev A.V., Baryshev A.V.

This paper presents a new technique for forming SNOM (Scanning Near-Field Optical Microscopy) cantilevers. The technique is based on the continuous growth of a conical hollow tip using local ion-induced carbon deposition on standard tipless cantilever chips. This method offers precise control of the geometric parameters of the cantilever's tip, including the angle of the tip, the probe's curvature radius, and the input and output aperture diameter. Such control allows to optimize the probe for specific tasks. The use of local structure methods based on FIB (Focused Ion Beam) enables the production of SNOM cantilevers with high radiation transmittance, tip robustness, and the capability to measure sample topography in semi-contact AFM (Atomic Force Microscopy) mode. The research focused on optimizing the technology for manufacturing tips with specific geometric characteristics, facilitating accurate navigation and positioning in the area of interest. The manufactured probe samples being tested demonstrate sufficient accuracy and mechanical durability of the tip. Overall, this technique offers a novel approach to forming SNOM cantilevers, providing precise control over geometric parameters and promising enhanced performance in various applications.

Kulikova D.P., Baburin A.S., Amiraslanov A.S., Lotkov E.S., Rodionov I.A., Pukhov A.A., Baryshev A.V., Dorofeenko A.V.

Based on ellipsometry and transmission spectra, optical parameters of palladium and platinum films were determined. The Pd and Pt films had a thickness of 5 – 7 nm and were studied both on a SiO2 and WO3 substrates. Despite the extremely small thicknesses, the parameters of most films were well described by isotropic dielectric constant. An interesting feature was that films deposited directly on a SiO2 substrate had a positive (rather than negative, characteristic of a metal) real part of the effective dielectric constant, while the films deposited on WO3 exhibited metallic properties for unannealed films and properties characteristic of metal-dielectric composites for films that have been annealed (some of the films annealed at 300°C in argon retained their metallic properties).

Tananaev P., Shelaev A., Sgibnev Y., Kulikova D., Efremova S., Voennov A., Baryshev A.

Metal organic decomposition (MOD) for the metal oxides thin films fabrication has been used in various studies over the past 30 years. MOD is a simple and inexpensive method for manufacturing optical grade polycrystalline thin films, including bismuth-substituted yttrium iron garnet. We present a variant of the previously described MOD method and discuss a chemical route for fabricating thin porous oxide films with a thicknesses of more than 100 nm, which non-epitaxially crystallized on fused silica substrates into BixY3-xFe5O12 layers (x = 0.5 and 1.5). Studies of the structural and magneto-optical properties of the layers show that the garnet layers crystallized under optimal conditions are characterized by high values of the specific Faraday rotation. Importantly, crystallization can be done locally by laser irradiation, and wet etching makes possible to remove non-crystallized areas, thus extending microfabrication capabilities.

Rodionov S.A., Kulikova D.P., Pomozov A.R., Afanasyev K.N., Merzlikin A.M., Baryshev A.V.

For light coupling to partially oxidized permalloy nanofilms, unusual polarization features were demonstrated experimentally and theoretically by analyzing angle-resolved spectra of the ellipsometric parameters, reflection and transmission polarization-resolved spectra at oblique incidence. The polarizing angles for light reflected from the nanofilms were revealed as resonant features. These were dips in reflection spectra for the p-polarized waves, whose reflection was totally suppressed, and the phase experienced a «π-jump » at two wavelengths. It was explained by the simultaneous fulfillment of amplitude equivalence and phase resonance conditions for the p-polarized light waves reflected from a subwavelength bilayer, which was a low-loss oxide layer on an absorbing metal layer.

Sgibnev Y., Tananaev P., Shelaev A., Yankovskii G., Baryshev A.

The detection of humidity plays a vital role in healthcare, industrial, and scientific areas, and the development of an ideal sensor is in continuous progress. In this work, a relative humidity (RH) optical sensor based on localized surface plasmon resonance of self-assembled gold nanoparticles formed by thermal dewetting and coated with Nafion fluoropolymer is under study. Sensor performance has been found to substantially depend on Nafion layer thickness. The best sensing element—an array of gold nanoparticles covered with a 300 nm-thick Nafion—has been shown to possess a linear response in a wide dynamic range of 0–85% RH with a limit of detection down to 0.12%. Thus, a simple and low-cost method for high-accuracy RH detection has been demonstrated.

Sgibnev Y., Marasanov D., Smetanin I., Uskov A., Kuzmenko N., Ignatiev A.I., Nikonorov N.V., Baryshev A.

Photocatalytic glass-ceramics doped with metallic Ag, semiconductor AgBr, and hybrid metal-semiconductor Ag-AgBr nanostructures were synthesized via low-temperature Na+-Ag+ ion exchange. Spectral features of the nanostructures in silicate glass matrix as...

Baburin A.S., Moskalev D.O., Lotkov E.S., Sorokina O.S., Baklykov D.A., Avdeev S.S., Buzaverov K.A., Yankovskii G.M., Baryshev A.V., Ryzhikov I.A., Rodionov I.A.

When talking about nanophotonics, quantum computing and sensing high-quality factor plasmonic devices are playing crucial role. In most cases for making such devices one has to use non-lattice matched or transparent amorphous substrates. Plasmonic devices quality factor is mainly determined by ohmic losses, scattering losses at grain boundaries, and in-plane plasmonic scattering losses of a metal – substrate system. We demonstrate here the e-beam evaporation method to deposit ultralow-loss silver thin films on transparent lattice-mismatched substrates. This process corresponds to evolutionary selection growth mode. The key feature of our approach is a precise control during the whole process consisting of film deposition on a cold substrate, self-crystallization and subsequent annealing for stress relaxation. In particular, the stress relaxation leads to further grains growth. We are able to deposit 100 nm thick polycrystalline silver films with micrometer-scale grains, low roughness and ultralow optical losses. Finally, we show ultrahigh-quality factor plasmonic silver nanostructures on transparent lattice-mismatched substrate. This can be of the great interest for high performance and single-molecule optical sensors applications.

Valiev D., Kharisova R., Babkina A., Zyryanova K., Kuzmenko N., Sgibnev Y., Shelaev A., Baryshev A.V.

For the first time, the synthesis, luminescent and structural properties of stable perovskite-type (Cs1−xRbx)4PbBr6 (R = Cs, Rb) nanocrystals are shown. In the absence of rubidium, Cs4PbBr6 and CsPbBr3 perovskite crystals precipitate in the ZnO–Na2O–B2O3–GeO2 glass matrix. With ascending rubidium content, the precipitation of (Cs,Rb)4PbBr6 nanocrystals is replaced by the Rb4PbBr6 nanocrystals nucleation. Nucleated nanocrystals exhibit an intense green luminescence. With an increase of the rubidium content, the luminescence maximum shifts to the blue region, the luminescence quantum yield increases from 28 to 51%, and the average decay time increases from 2 to 8 ns. Several assumptions have been made about the nature of the green luminescence of perovskite-like Cs4PbBr6 and (Cs,Rb)4PbBr6 crystals in glasses. It is concluded that the most probable cause is the impurity inclusions of CsPbBr3 and (Cs,Rb)PbBr3 crystals.

Kulikova D.P., Afanasyev K.N., Baryshev A.V.

Spectra of oxidized permalloy nanofilms were studied when subjecting them to hydrogenation. In contrast to the usual change in transmittance (optical constants) inherent to gasochromic metal oxides, we demonstrate changes in optical gyrotropy of oxidized permalloy/platinum bilayers. Hydrogenation of the bilayers caused changes in both the spectral shape and magnitude of the wavelength dependence of the Faraday rotation. The observed transformations were proved to have the nonreciprocal nature, thus demonstrating “gasogyrochromism” of the magnetic oxides under study.

Kulikova D.P., Sgibnev Y.M., Yankovskii G.M., Chubchev E.D., Lotkov E.S., Ezenkova D.A., Dobronosova A.A., Baburin A.S., Rodionov I.A., Nechepurenko I.A., Baryshev A.V., Dorofeenko A.V.

AbstractNanostructure based on a dielectric grating (Al2O3), gasochromic oxide (WO3) and catalyst (Pd) is proposed as a hydrogen sensor working at the room temperature. In the fabricated structure, the Pd catalyst film was as thin as 1 nm that allowed a significant decrease in the optical absorption. A high-Q guided-mode resonance was observed in a transmission spectrum at normal incidence and was utilized for hydrogen detection. The spectra were measured at 0–0.12% of hydrogen in a synthetic air (≈ 80% $${\text{N}}_{2}$$ N 2 and 20% $${\text{O}}_{2}$$ O 2 ). The detection limit below 100 ppm of hydrogen was demonstrated. Hydrogen was detected in the presence of oxygen, which provides the sensor recovery but suppresses the sensor response. Sensor response was treated by the principal component analysis (PCA), which effectively performs noise averaging. Influence of temperature and humidity was measured and processed by PCA, and elimination of the humidity and temperature effects was performed. Square root dependence of the sensor response on the hydrogen concentration (Sievert’s law) was observed. Sensor calibration curve was built, and the sensor resolution of 40 ppm was found. Long term stability of the sensor was investigated. Particularly, it was shown that the sensor retains its functionality after 6 months and dozens of acts of response to gas.

Shelaev A., Sgibnev Y., Efremova S., Tananaev P., Baryshev A.

• A method of local laser annealing for the crystallization of Bi:YIG from oxide films obtained by metal–organic decomposition has been developed. • Bi:YIG laser crystallization was carried out in dry air, O 2 , N 2 and Ar atmospheres . • By-products of crystallization after annealing in O 2 , N 2 and Ar in the form of metallic Bi and Fe oxides were identified by Raman spectroscopy . • The largest Faraday rotation was found to be 2.6 deg/µm (at 500 nm wavelength) for a Bi 0.5 :YIG garnet film annealed in air. Rapid thermal annealing (RTA) at 800–900 °C in air atmosphere is commonly used to crystallize bismuth-substituted yttrium iron garnet (Bi:YIG) deposited by vacuum evaporation techniques or metal–organic decomposition. However, the conventional RTA leads to undesirable effects in applications where Bi:YIG is the constituent material of a nano- or microstructure. Here we report on an approach to Bi:YIG local crystallization by a focused continuous wave laser beam ( L RTA). The structural and optical properties of micron-sized Bi:YIG stripes crystallized in air, oxygen, nitrogen and argon atmospheres are discussed. The demonstrated LRTA can find practical applications for Bi:YIG monolithic integration on non-garnet substrates.

Ren Y., Huang Z., Fang Y., Chu Y., Liu Z.

Abdullah M., Hosain M.M., Hassan Parvez M.M., Haque Motayed M.S.

Prokaznikov A.V., Selyukov R.V., Paporkov V.A.

He Y., Zhang C., Wang Q., Gao S., Li S., Yang C., Liu X., Guo X.

Pillai A.M., Nair N., Das M.K., Ram S.K.

Afrouzi S., Fallahi V., Aghbolaghi R., Navid H.A.

Chowdhury M.A., Oehlschlaeger M.A.

Cho N.H., Jia J., Park S., Wen X., Odom T.W.

Pourhassan H., Abdol S.O., Abdollahipour B.

Sgibnev Y.M., Shelaev A.V., Bykov I.V., Marasanov D.V., Ignatiev A.I., Nikonorov N.V., Baryshev A.V.

Askarzadeh N., Shokrollahi H., Karimi L.

Das H.R., Mondal H.

Lin Y., Wu Z., Mei E., Yang J., He Y., Xu Z., Liang X., Hu X., Liu R., Xiang W.

Mamian K.A., Popov V.V., Frolov A.Y., Fedyanin A.A.

Tailoring of the transverse magneto-optical Kerr effect (TMOKE) in hybrid metasurfaces comprising rectangular silicon nanowires coupled with a nickel substrate is demonstrated. The excitation of Mie modes of different orders in nanowires causes TMOKE enhancement. The in-plane magnetic dipole mode leads to the largest TMOKE enhancement compared to other Mie modes. Changing the width of silicon nanowires entails a modification of that mode, thereby ensuring tailoring of the TMOKE within the range of 2.2%–3.8%. This tunability is associated with the modification of the near-field localized at the Si/Ni interface and the far-field response of the excited magnetic dipole mode. Adjusting these two quantities allows one to achieve the highest values of the TMOKE caused by individual Mie modes in silicon nanowires.

Duan Y., Gu K., Li S., Du J., Zhang J.

AbstractPerovskite quantum dots (PQDs) have emerged as prominent candidates for a variety of optoelectronic applications, including solar cells, white light‐emitting diodes (WLED), and liquid crystal displays (LCD), owing to their remarkable optical and electronic properties. These properties encompass high absorption coefficients, elevated quantum yields, tunable bandgaps, and narrow emission peaks. Nonetheless, PQDs are inherently unstable due to their low formation energy and ionic crystal nature, making them susceptible to degradation upon exposure to light, heat, and moisture. To address these challenges, encapsulating PQDs within an inorganic glass matrix has been proven effective. The rigid structure of the glass matrix significantly enhances the stability of PQDs while preserving their exceptional optical characteristics. This review provides an overview of recent advancements in PQD glasses and aims to offer critical insights to propel future research in this domain. The commonly employed glass matrix and preparation techniques for PQD glasses are reviewed, highlighting their fundamental properties such as structural integrity, optical performance, andstability, and discussing the approaches to improve the optical properties of PQD glasses, which include glass component regulation and PQD structure regulation. Additionally, the potential applications of PQD glasses in diverse areas, including WLED, LCD, and temperature sensing are explored.

Zhang K., He L., Jiang L., Jiang S., Yu R., Lau H.C., Xie C., Chen Z.

Hydrogen, primarily produced from steam methane reforming, plays a crucial role in oil refining, and provides a solution for the oil and gas industry's long-term energy transition by reducing CO2 emissions. This paper examines hydrogen's role in this transition. Firstly, experiences from oil and gas exploration, including in-situ gasification, can be leveraged for hydrogen production from subsurface natural hydrogen reservoirs. The produced hydrogen can serve as fuel for generating steam and heat for thermal oil recovery. Secondly, hydrogen can be blended into gas for pipeline transportation and used as an alternative fuel for oil and gas hauling trucks. Additionally, hydrogen can be stored underground in depleted gas fields. Lastly, oilfield water can be utilized for hydrogen production using geothermal energy from subsurface oil and gas fields. Scaling up hydrogen production faces challenges, such as shared use of oil and gas infrastructures, increased carbon tax for promoting blue hydrogen, and the introduction of financial incentives for hydrogen production and consumption, hydrogen leakage prevention and detection.

Choudhary M., Shrivastav A., Sinha A.K., Chawla A.K., Avasthi D.K., Saravanan K., Krishnamurthy S., Chandra R., Wadhwa S.

Swager T.M., Pioch T.N., Feng H., Bergman H.M., Luo S.L., Valenza J.J.

Girão A.F., Completo A.

Hydrogen energy is a cornerstone of the future climate-neutral economy. Yet, as undetected leaks easily generate dangerous atmospheres, sensing systems must timely detect accumulated hydrogen to prevent ignitions and explosions. Eye-readable sensors (ERSs) displaying intuitive readouts promise to guarantee safe use and universal access to hydrogen-based technology. This review highlights the impact of reversible ERSs in hydrogen monitoring to contextualize their current and potential applicability. First, sensing mechanisms for gasochromic tungsten oxide films and switchable metal hydrides are critically overviewed. Then, pivotal strategies targeting real-time monitorization indoors and permanent leak recording outdoors are presented along with standard hydrogen leakage scenarios, elucidating opportunities for ERSs. Finally, important challenges and desirable user-friendly concepts are discussed with the purpose of narrowing the gap between this class of sensors and the forthcoming hydrogen society.

Kavre Piltaver I., Peter R., Salamon K., Micetic M., Petravic M.

Hong S.H., Kim Y.K., Hwang S., Seo H., Lim S.K.

The PdO decorated ZnO (PdO@ZnO) colorimetric hydrogen sensor garners attention for visually detecting hydrogen leaks without relying on external electrical systems. While sensitivity optimization primarily focuses on PdO variations, the influence of the ZnO substrate effect remains less explored. PdO@ZnO hybrids with four different morphologies (sphere, rod, plate, hexagonal disk) are synthesized using an acid-base reaction. The morphology of ZnO influences PdO adsorption due to variations in surface area and oxygen defects. The chemical state of adsorbed palladium species is also affected by the ZnO charge. Among these hybrids, the PdO@ZnO hexagonal disk demonstrates the quickest response time (T90; 182.4s) and the highest color difference (ΔE; 16) under exposure to 4 vol% hydrogen gas. This superior performance is attributed to the hexagonal disk's larger surface area, appropriate zeta potential, and oxygen defect, all of which enhance PdO adsorption. These findings enhance our comprehension of how morphology impacts the colorimetric hydrogen sensitivity of PdO@ZnO hybrids.

Xu F., Ma J., Hu K., Zhang Z., Ma C., Guan B., Chen K.

Hydrogen (H2) is a renewable energy gas and an important industrial raw material playing important roles in many fields. However, H2 is colorless, odorless and highly flammable within a wide concentration range. So H2 detection is very important for leakage monitoring especially at low concentration. Here we propose an ultrahigh sensitivity H2 sensor with a perforated palladium (Pd) film on the tip of an optical fiber. The suspended Pd nanohole film forms a Fabry-P é rot (FP) interferometer with a silica capillary fused onto the fiber. Upon H2 adsorption, the Pd nanohole film bends inwards leading to spectral shift of the FP cavity. With the film perforated, its Young’s modulus becomes effectively smaller giving rise to larger spectral shift and higher H2 sensitivity. We experimentally studied the effect of the structural parameters of the holey film on the H2 sensing performance and achieved a H2 detection sensitivity of 7.1 pm/ppm and a detection limit of 1.7 ppm. The sensor also shows good repeatability and gas selectivity and is expected to find applications as optical H2 sensors working at low concentrations.

Höflich K., Hobler G., Allen F.I., Wirtz T., Rius G., McElwee-White L., Krasheninnikov A.V., Schmidt M., Utke I., Klingner N., Osenberg M., Córdoba R., Djurabekova F., Manke I., Moll P., et. al.

The focused ion beam (FIB) is a powerful tool for fabrication, modification, and characterization of materials down to the nanoscale. Starting with the gallium FIB, which was originally intended for photomask repair in the semiconductor industry, there are now many different types of FIB that are commercially available. These instruments use a range of ion species and are applied broadly in materials science, physics, chemistry, biology, medicine, and even archaeology. The goal of this roadmap is to provide an overview of FIB instrumentation, theory, techniques, and applications. By viewing FIB developments through the lens of various research communities, we aim to identify future pathways for ion source and instrumentation development, as well as emerging applications and opportunities for improved understanding of the complex interplay of ion–solid interactions. We intend to provide a guide for all scientists in the field that identifies common research interest and will support future fruitful interactions connecting tool development, experiment, and theory. While a comprehensive overview of the field is sought, it is not possible to cover all research related to FIB technologies in detail. We give examples of specific projects within the broader context, referencing original works and previous review articles throughout.

Muhammed N.S., Gbadamosi A.O., Epelle E.I., Abdulrasheed A.A., Haq B., Patil S., Al-Shehri D., Kamal M.S.

Indubitably, hydrogen demonstrates sterling properties as an energy carrier and is widely anticipated as the future resource for fuels and chemicals. Herein, an updated assessment of progress recorded on the production, transportation, utilization, and storage of hydrogen is examined. Firstly, the numerous routes for the production of hydrogen from renewable and non-renewable sources are systematically demystified. Subsequently, the transportation framework for hydrogen is discussed. Moreover, the industrial application of hydrogen is elucidated and the existing hydrogen storage systems are chronologically analyzed. From the review of the literature, photocatalytic water splitting technology is the most environmentally benign method available for H2 production. Additionally, underground hydrogen storage in a geologic porous medium offers the largest and most affordable storage capacity for H2 gas. Nonetheless, the compatibility of H2 with reservoir fluid in porous media and other safety concerns has to be adequately understood to avoid preventable losses. Finally, the key research gaps were highlighted and potential areas for future research are proffered.

Xu F., Ma J., Li C., Ma C., Li J., Guan B., Chen K.

Hydrogen (H2) sensors are critical to various applications such as the situation where H2 is used as the clean energy for industry or the indicator for human disease diagnosis. Palladium (Pd) is widely used as the hydrogen sensing material in different types of sensors. Optical fiber H2 sensors are particularly promising due to their compactness and spark-free operation. Here, we report a Fabry–Pérot (FP)-cavity-based H2 sensor that is formed with a freestanding Pd membrane and integrated on a conventional single-mode optical fiber end. The freestanding Pd membrane acts both as the active hydrogen sensing material and as one of the reflective mirrors of the cavity. When the Pd film absorbs H2 to form PdHx, it will be stretched, resulting in a change of the cavity length and thus a shift of the interference spectrum. The H2 concentration can be derived from the amplitude of the wavelength shift. Experimental results showed that H2 sensors based on suspended Pd membranes can achieve a detection sensitivity of about 3.6 pm/ppm and a detection limit of about 3.3 ppm. This highly sensitive detection scheme is expected to find applications for sensing low-concentration H2.

Song K., Weng S., Zhou J., Jiang R., Cao H., Zhang H.

Hwang J., Maharjan K., Cho H.

Decarbonizing the power generation and transportation sectors, responsible for ∼65% of Green House Gas (GHG) emissions globally, constitutes a crucial step to addressing climate change. Accordingly, the energy paradigm is shifting towards carbon-free and low-emission alternative fuels. Even though the current decarbonization using hydrogen is not large since 96% of global hydrogen production is relying on conventional fossil fuels that produce GHGs in the process, hydrogen fuel has been considered a promising fuel for fuel cell and combustion engines. Various renewable approaches utilizing biomass and water have been investigated to produce green hydrogen. With this, recent developments showed viability to achieve deep decarbonization in the power generation and transportation sectors. Hydrogen-powered vehicles are commercially available in many countries, and over 300,000 fuel cell appliances were sold to produce hot water and electricity. This review aims to provide an overview of the potential role of hydrogen in power generation and transportation systems, recent achievements in research development, and technical challenges to successfully applying hydrogen as a primary fuel. Especially this review will focus on the hydrogen application in power generation and transportation sectors using fuel cells, gas turbines, and internal combustion engines (ICEs).

Dubey C., Yadav A., Baloni D., Kachhap S., Singh S.K., Singh A.K.

We report a comprehensive study of the structural, morphological, and optical properties, and UC-based ratiometric temperature sensing behavior of (α) cubic and (β) hexagonal phases of NaYF4:Yb3+/Er3+ nanoparticles.

Baburin A.S., Moskalev D.O., Lotkov E.S., Sorokina O.S., Baklykov D.A., Avdeev S.S., Buzaverov K.A., Yankovskii G.M., Baryshev A.V., Ryzhikov I.A., Rodionov I.A.

When talking about nanophotonics, quantum computing and sensing high-quality factor plasmonic devices are playing crucial role. In most cases for making such devices one has to use non-lattice matched or transparent amorphous substrates. Plasmonic devices quality factor is mainly determined by ohmic losses, scattering losses at grain boundaries, and in-plane plasmonic scattering losses of a metal – substrate system. We demonstrate here the e-beam evaporation method to deposit ultralow-loss silver thin films on transparent lattice-mismatched substrates. This process corresponds to evolutionary selection growth mode. The key feature of our approach is a precise control during the whole process consisting of film deposition on a cold substrate, self-crystallization and subsequent annealing for stress relaxation. In particular, the stress relaxation leads to further grains growth. We are able to deposit 100 nm thick polycrystalline silver films with micrometer-scale grains, low roughness and ultralow optical losses. Finally, we show ultrahigh-quality factor plasmonic silver nanostructures on transparent lattice-mismatched substrate. This can be of the great interest for high performance and single-molecule optical sensors applications.

Zhuang W., Liu H., Chen Y., Xu W., Gao H., Tian Y., Yao D., Zhang H.

Lead-free double perovskite nanocrystals (LFDP NCs) are promising materials for illumination and display applications because of their potential to overcome the toxicity and instability of lead-based counterparts. Despite the success in the synthesis of LFDP NCs, tunable control over the photoluminescence (PL) of LFDP NCs is still challenging. Herein, brightly emissive and stable Rb+, Sb3+-codoped Cs2NaInCl6 NCs are synthesized while fulfilling tunable self-trapped exciton (STE) emission in the blue region through the A, B-site codoping strategy. Sb3+ is introduced into the B-site of Cs2NaInCl6 NCs to break the parity-forbidden transition and boost the emission efficiency. By further altering the amount of A-site doped Rb+, the emission peak of the NCs is tunable from 447 to 528 nm, because Rb+ enlarges the electron-phonon coupling energy, which leads to larger Stokes shifts and therefore the continuous red-shift of PL emission. The Rb+, Sb3+-codoped Cs2NaInCl6 NCs exhibit robust PL and phase stability against moisture after one year of storage. A series of LFDP NCs with tunable emission are synthesized according to the codoping strategy and further employed as the color conversion materials for fabricating light-emitting diodes.