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Plasmonic Chiral Metasurface Absorber Based on Bilayer Fourfold Twisted Semicircle Nanostructure at Optical Frequency
Yongzhi Cheng1, Fu Chen2,3, Hui Luo4
1School of Information Science and Engineering, Wuhan University of Science and Technology, Wuhan, 430081, People's Republic of China. cyz0715@126.com.
Nanoscale Research Letters
|January 14, 2021
Summary
This study introduces a plasmonic chiral metasurface absorber (CMSA) for selective light absorption. The novel metasurface demonstrates high absorption for both left-handed and right-handed circularly polarized light at optical frequencies.
Area of Science:
- Plasmonics
- Metamaterials
- Nanophotonics
- Chiroptical phenomena
Background:
- Chiral metasurfaces offer unique light-matter interactions.
- Selective absorption of circularly polarized light is crucial for optical applications.
- Plasmonic nanostructures enable tailored optical responses.
Purpose of the Study:
- To design and investigate a plasmonic chiral metasurface absorber (CMSA).
- To achieve high selective absorption for left-handed (LCP) and right-handed (RCP) circularly polarized light.
- To analyze the chiroptical response and underlying mechanisms.
Main Methods:
- Fabrication of a dielectric substrate with bi-layer fourfold twisted semicircle metal nanostructures.
- Optical characterization of the CMSA's absorption spectra for LCP and RCP light.
- Numerical simulations to analyze electric field distributions and understand the chiroptical mechanism.
Main Results:
- The CMSA exhibits strong selective absorption bands for LCP and RCP light at different resonance frequencies.
- Achieved absorbance of 93.2% for LCP and 91.6% for RCP light.
- Maximum circular dichroism (CD) magnitudes of 0.85 and 0.91 were observed around 288.5 THz and 404 THz, respectively.
Conclusions:
- The proposed CMSA effectively demonstrates high selective absorption for circularly polarized light.
- The nanostructure geometry significantly influences the circular polarization selective absorption.
- The study provides insights into the mechanism of strong chiroptical responses in metasurfaces.
