Wavelength-tunable infrared chiral metasurfaces with phase-change materials
Wavelength-tunable infrared chiral metasurfaces with phase-change materials
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DOI：
10.1364/oe.489841
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发表时间：
2023-06-19
期刊：
影响因子：
3.8
通讯作者：
Gao, Jie
中科院分区：
文献类型：
--
作者：
Tang, Haotian;Stan, Liliana;Gao, Jie
光学相变材料在相变过程中具有介电常数可调和开关特性，为光学器件的动态控制提供了可能。在这里，一个波长可调谐的红外手征超颖表面集成相变材料GST-225与设计的平行四边形形状的谐振器的单元格被证明。通过在高于GST-225的相变温度的温度下改变烘烤时间，手性超颖表面的共振波长被调谐在2.33 μ m至2.58 μ m的波长范围内，而吸收中的圆二色性保持在0.44左右。通过分析在左旋和右旋圆偏振光（LCP和RCP）照射下的电磁场和位移电流分布，揭示了所设计超颖表面的手光学响应.此外，光热效应进行了模拟，以调查在LCP和RCP照明下的手征超颖表面的大温差，这使得圆偏振控制相变的可能性。所提出的具有相变材料的手征超表面具有促进红外领域有前途的应用的潜力，例如手征热开关、红外成像和可调手征光子学。COPY; 2023 Optica出版集团根据Optica开放获取出版协议的条款
Optical phase-change materials exhibit tunable permittivity and switching properties during phase transition, which offers the possibility of dynamic control of optical devices. Here, a wavelength-tunable infrared chiral metasurface integrated with phase-change material GST-225 is demonstrated with the designed unit cell of parallelogram-shaped resonator. By varying the baking time at a temperature above the phase transition temperature of GST-225, the resonance wavelength of the chiral metasurface is tuned in the wavelength range of 2.33 & mu;m to 2.58 & mu;m, while the circular dichroism in absorption is maintained around 0.44. The chiroptical response of the designed metasurface is revealed by analyzing the electromagnetic field and displacement current distributions under left-and right-handed circularly polarized (LCP and RCP) light illumination. Moreover, the photothermal effect is simulated to investigate the large temperature difference in the chiral metasurface under LCP and RCP illumination, which allows for the possibility of circular polarization-controlled phase transition. The presented chiral metasurfaces with phase-change materials offer the potential to facilitate promising applications in the infrared regime, such as chiral thermal switching, infrared imaging, and tunable chiral photonics.& COPY; 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement