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Mid-infrared chiral metasurface absorbers with split-ellipse structures

Journal Article · · Optics Communications
 [1];  [2];  [2];  [3];  [1]
  1. Missouri Univ. of Science and Technology, Rolla, MO (United States)
  2. Argonne National Laboratory (ANL), Argonne, IL (United States). Center for Nanoscale Materials (CNM)
  3. Missouri Univ. of Science and Technology, Rolla, MO (United States); Stony Brook Univ., NY (United States)
Natural chiral materials usually have very weak circular dichroism (CD) responses. Here, in this study, we design and demonstrate one type of mid-infrared chiral metasurface absorber with strong chiroptical effects, which can achieve high CD in absorption above 0.57 over the wavelength range of 5 to 5.9 μm. The maximum absorption of the chiral metasurface absorber under circularly polarized light can reach 0.90 and the maximum CD in absorption is 0.63. Meanwhile, the chiral resonance wavelength and the CD value can be tuned by varying the geometric parameters of the metasurface. A thermal analysis of the metasurface absorber further shows the strong connection between CD in absorption and temperature difference. The demonstrated chiral metasurface absorbers can be used in many promising applications such as molecular sensing, thermophotovoltaics and chiral spectroscopy.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
2437751
Journal Information:
Optics Communications, Journal Name: Optics Communications Vol. 525; ISSN 0030-4018
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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