Mid-infrared chiral metasurface absorbers with split-ellipse structures
Mid-infrared chiral metasurface absorbers with split-ellipse structures
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DOI：
10.1016/j.optcom.2022.128854
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发表时间：
2022-08
影响因子：
2.4
通讯作者：
Xiang-hua Zeng;D. Rosenmann;D. Czaplewski;Jie Gao;Xiaodong Yang
中科院分区：
文献类型：
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作者：
Xiang-hua Zeng;D. Rosenmann;D. Czaplewski;Jie Gao;Xiaodong Yang
天然手性材料通常具有非常弱的圆二色性（CD）响应。在此，我们设计并演示了一种具有强热效应的中红外手性超表面吸收体，在5 ~ 5波长范围内可以实现0.57以上的高吸收CD。手性超表面吸收剂在圆偏振光下的最大吸收率可达0.90，最大吸收CD为0.63。同时，可以通过改变超表面的几何参数来调节手性共振波长和CD值。对超表面吸收剂的热分析进一步表明了吸收CD与温差之间的密切联系。所展示的手性超表面吸收剂可用于许多有前途的应用，如分子传感，热光伏和手性光谱。
Natural chiral materials usually have very weak circular dichroism (CD) responses. Here, we design and demonstrate one type of mid-infrared chiral metasurface absorber with strong chiroptical effects, which can achieve high CD in absorption above 0.57 over the wavelength range of 5 to 5. 9 μ m. The maximum absorption of the chiral metasurface absorber under circularly polarized light can reach 0.90 and the maximum CD in absorption is 0.63. Meanwhile, the chiral resonance wavelength and the CD value can be tuned by varying the geometric parameters of the metasurface. A thermal analysis of the metasurface absorber further shows the strong connection between CD in absorption and temperature difference. The demonstrated chiral metasurface absorbers can be used in many promising applications such as molecular sensing, thermophotovoltaics and chiral spectroscopy.