Open Access
Open access
Optics Express, volume 29, issue 23, pages 38557

Wave-thermal effect of a temperature-tunable terahertz absorber

Xiong Han 1, 2
Xiaodong Ma 1
Huaiqing Zhang 1
Publication typeJournal Article
Publication date2021-11-03
Journal: Optics Express
scimago Q1
SJR0.998
CiteScore6.6
Impact factor3.2
ISSN10944087
PubMed ID:  34808906
Atomic and Molecular Physics, and Optics
Abstract
Heat-sensitive materials have great applications in sensor, detector, and tunable photoelectric devices. However, the wave-thermal effect of the heat-sensitive material is rarely been investigated in the THz range. Here, we propose the incorporation of heat-sensitive material (strontium titanate (STO)) within a THz absorber. The simulated results show that the absorptance and frequency can be dynamically controlled by the temperature of STO. Because the absorbed THz waves are finally converted into heat, then we research the theoretical mechanism of heat generation. Theoretical analysis shows that there are two reasons for the temperature rise: surface plasmon polariton (SPP) and ohmic loss of gold patch; Electromagnetic energy consumption inside the loss materials. To verify the theory, finally, we use COMSOL Multiphysics to research the nanosecond wave-thermal effect. The transient temperature of the wave-thermal effect is calculated quantitatively. The quantitative prediction of temperature variation can provide good guidance for thermal regulation and wave-thermally tunable THz devices.
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