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.

中文翻译：

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中红外波长范围内的手性等离子体超表面吸收剂

中红外波长范围内的手性超材料在研究热发射操纵和分子振动传感方面具有巨大潜力。在这里，我们介绍了一种手征型等离子超表面吸收剂，它在5–5.5 µm的中红外波长范围内的吸收率大于0.56，具有较高的圆二色性（CD）。证明的手性超表面吸收剂的最大手性吸收为0.87，最大CD吸收率为0.60。通过调整超表面的晶胞结构的几何参数，手性吸收峰可以移动到不同的波长。由于强烈的手性响应，对设计的手性超表面吸收剂的热分析进一步显示了左旋和右旋圆偏振光之间的温差较大。