Chiral metasurfaces of wavy rectangle resonators with tunable circular dichroism
Chiral metasurfaces of wavy rectangle resonators with tunable circular dichroism
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DOI：
10.1016/j.ijleo.2023.171024
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发表时间：
2023-05
期刊：
影响因子：
3.1
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
工作在中红外波段的手性超颖表面在手性分子振动传感和其它应用中具有重要的意义。在这里，中红外手征超颖表面的波纹矩形谐振器具有强大的手征光学响应和可调谐的圆二色性（CD）被证明。手性超颖表面表现出大于0.57的高CD值，因为通过扩大晶胞的几何尺寸将手性等离子体共振波长从4.96 μ m调谐到5.82 μm。此外，通过简单地重新定位切割槽以改变波状矩形结构的几何对称性，可以在不改变手性等离子体共振波长的情况下将CD值从正连续调谐到零和负。这些结果旨在推动中红外频率的许多有前途的应用的发展，包括蛋白质分子检测，热发射控制和红外光通信。
Chiral metasurfaces operating at the mid-infrared frequencies are of great interest for chiral molecule vibrational sensing and other applications. Here, mid-infrared chiral metasurfaces of wavy rectangle resonators with strong chiroptical response and tunable circular dichroism (CD) are demonstrated. The chiral metasurface exhibits a high CD value of more than 0.57 as the chiral plasmonic resonance wavelength is tuned from 4.96 to 5.82 µm by enlarging the geometric dimensions of the unit cell. Furthermore, CD values can be continuously tuned from positive to zero and negative without altering the chiral plasmonic resonance wavelength, by simply relocating the cutting slot to change the geometric symmetry of the wavy rectangle structure. These results aim to advance the development of many promising applications in mid-infrared frequencies including protein molecule detection, thermal emission control, and infrared-light communication.