Broadband infrared circular dichroism in chiral metasurface absorbers
Broadband infrared circular dichroism in chiral metasurface absorbers
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DOI：
10.1088/1361-6528/ab88ea
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发表时间：
2020-04
期刊：
影响因子：
3.5
通讯作者：
Leixin Ouyang;D. Rosenmann;D. Czaplewski;Jie Gao;Xiaodong Yang
中科院分区：
文献类型：
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作者：
Leixin Ouyang;D. Rosenmann;D. Czaplewski;Jie Gao;Xiaodong Yang
手性在自然界中普遍存在，在许多领域都至关重要，但天然材料具有弱且窄带的手性光学效应。在这里，设计并演示了手性等离子体超表面吸收器，以实现大宽带红外圆二色性（CD）。该宽带手性吸收体由多个不同尺寸的双矩形谐振器组成，在1.35 µm至1.85 µm的波长范围内，对0.7以上的左旋或右旋圆偏振（LCP或RCP）光表现出强吸收，并且在0.5以上的大CD吸收。还获得了高宽带偏振相关的局部温度升高。通过改变入射光的波长和偏振，进一步呈现可切换的红外反射手性图像。宽带手性超表面吸收器有望在偏振检测、热光伏和手性成像等许多领域得到应用。
Chirality is ubiquitous in nature and it is essential in many fields, but natural materials possess weak and narrow-band chiroptical effects. Here, chiral plasmonic metasurface absorbers are designed and demonstrated to achieve large broadband infrared circular dichroism (CD). The broadband chiral absorber is made of multiple double-rectangle resonators with different sizes, showing strong absorption of left-handed or right-handed circularly polarized (LCP or RCP) light above 0.7 and large CD in absorption more than 0.5 covering the wavelength range from 1.35 µm to 1.85 µm. High broadband polarization-dependent local temperature increase is also obtained. The switchable infrared reflective chiral images are further presented by changing the wavelength and polarization of incident light. The broadband chiral metasurface absorbers promise future applications in many areas such as polarization detection, thermophotovoltaics, and chiral imaging.