Journal
OPTICS EXPRESS
Volume 27, Issue 20, Pages 28313-28323Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.27.028313
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Funding
- National Science Foundation [DMR-1552871, ECCS-1653032]
- Office of Naval Research [N00014-16-1-2408]
- U.S. Department of Energy [DE-AC02-06CH11357]
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Strong circular dichroism in absorption in the near-infrared wavelength range is realized by designing binary-pattern chiral plasmonic metasurfaces via the micro-genetic algorithm optimization method. The influence of geometric parameter modifications in the binary-pattern nanostructures on the circular dichroism performance is studied. The strong circular dichroism in absorption is attributed to the simultaneous excitation and field interference of the resonant modes with relative phase delay under linearly polarized incident light. This work provides a universal design method toward the on-demand properties of chiral metasurfaces, which paves the way for future applications in chemical and biological sensing, chiral imaging and spectroscopy. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
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