研究目的
To propose and demonstrate an ultrathin circular polarimeter based on monolayer MoSe2 and planar chiral plasmonic metasurfaces for detecting and distinguishing circularly polarized light.
研究成果
The proposed ultrathin circular polarimeter based on monolayer MoSe2 and planar chiral plasmonic metasurfaces demonstrates effective detection and distinction of circularly polarized light. The device's significant photoresponse CD discrimination, potential expandability, and ultrathin thickness offer opportunities for applications in integrated polarimetric imaging, biological sensing, and optical communication.
研究不足
The study mentions a minor deviation in the absorption and CD spectra between left- and right-handed metasurfaces due to experimental tolerance in sample fabrication and measurements. Additionally, the actual response time of the circular polarimeter could be shorter than the measured 100 ms, indicating potential for optimization.
1：Experimental Design and Method Selection:
The study involves the integration of chiral plasmonic metasurface with monolayer MoSe2 to create a device capable of detecting circularly polarized light. The methodology includes the fabrication of the device and the measurement of its optical and photocurrent responses under different circular polarization states.
2：Sample Selection and Data Sources:
Monolayer MoSe2 was used as the photoactive material, and chiral plasmonic metasurfaces were fabricated on it. Optical absorption and photocurrent responses were measured under circularly polarized light illumination.
3：List of Experimental Equipment and Materials:
A commercial microscopic imaging system for absorption spectra, a home-build optical setup with a sourcemeter for photocurrent measurements, and a supercontinuum light source system for spectral response of photocurrent.
4：Experimental Procedures and Operational Workflow:
The device was fabricated via a multistep process including electron beam evaporating, MoSe2 monolayer transfer, and e-beam lithography. Optical and photocurrent measurements were performed under controlled conditions.
5：Data Analysis Methods:
The photoresponsivity and photoresponsivity circular dichroism were calculated from the measured photocurrent responses to evaluate the device's performance in detecting circularly polarized light.
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