Ouyang Leixin, Rosenmann Daniel, Czaplewski David A, Gao Jie, Yang Xiaodong
Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, United States of America.
Nanotechnology. 2020 May 1;31(29):295203. doi: 10.1088/1361-6528/ab88ea. Epub 2020 Apr 14.
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.
手性在自然界中无处不在，并且在许多领域都至关重要，但天然材料具有微弱且窄带的旋光效应。在此，设计并展示了手性等离子体超表面吸收体，以实现宽带红外圆二色性（CD）。这种宽带手性吸收体由多个不同尺寸的双矩形谐振器制成，在0.7以上对左旋或右旋圆偏振（LCP或RCP）光表现出强烈吸收，在1.35 µm至1.85 µm波长范围内吸收中的圆二色性大于0.5。还获得了高度依赖宽带偏振的局部温度升高。通过改变入射光的波长和偏振，进一步呈现了可切换的红外反射手性图像。这种宽带手性超表面吸收体有望在偏振检测、热光伏和手性成像等许多领域得到未来应用。
