Chiral Plasmonic Metasurface Absorbers in the Mid-Infrared Wavelength Range
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.
M. S. Mahmud et al., "Chiral Plasmonic Metasurface Absorbers in the Mid-Infrared Wavelength Range," Optics Letters, vol. 45, no. 19, pp. 5372-5375, Optical Society of America (OSA), Oct 2020.
The definitive version is available at https://doi.org/10.1364/OL.404192
Mechanical and Aerospace Engineering
International Standard Serial Number (ISSN)
Article - Journal
© 2020 Optical Society of America (OSA), All rights reserved.
01 Oct 2020