Mahmud Md Shamim, Rosenmann Daniel, Czaplewski David A, Gao Jie, Yang Xiaodong
Opt Lett. 2020 Oct 1;45(19):5372-5375. doi: 10.1364/OL.404192.
Chiral metamaterials in the mid-infrared wavelength range have tremendous potential for studying thermal emission manipulation and molecular vibration sensing. Here, we present one type of chiral plasmonic metasurface absorber with high circular dichroism (CD) in absorption of more than 0.56 across the mid-infrared wavelength range of 5-5.5 µm. The demonstrated chiral metasurface absorbers exhibit a maximum chiral absorption of 0.87 and a maximum CD in absorption of around 0.60. By adjusting the geometric parameters of the unit cell structure of the metasurface, the chiral absorption peak can be shifted to different wavelengths. Due to the strong chiroptical response, the thermal analysis of the designed chiral metasurface absorber further shows the large temperature difference between the left-handed and right-handed circularly polarized light. The demonstrated results can be utilized in various applications such as molecular detection, mid-infrared filter, thermal emission, and chiral imaging.
中红外波长范围内的手性超材料在研究热发射操控和分子振动传感方面具有巨大潜力。在此，我们展示了一种手性等离子体超表面吸收体，在5 - 5.5 µm的中红外波长范围内，其吸收的圆二色性（CD）超过0.56。所展示的手性超表面吸收体表现出最大手性吸收为0.87，吸收的最大CD约为0.60。通过调整超表面单元结构的几何参数，手性吸收峰可移至不同波长。由于强烈的旋光响应，对所设计的手性超表面吸收体的热分析进一步表明左旋和右旋圆偏振光之间存在较大温差。所展示的结果可用于分子检测、中红外滤波器、热发射和手性成像等各种应用。
