研究目的
To design and demonstrate chiral plasmonic metasurface absorbers that achieve large broadband infrared circular dichroism (CD) and explore their applications in polarization detection, thermophotovoltaics, and chiral imaging.
研究成果
The study successfully demonstrates chiral plasmonic metasurface absorbers capable of achieving large broadband infrared CD and high broadband polarization-dependent local temperature increase. The switchable infrared reflective chiral images controlled by incident wavelength and polarization present promising applications in polarization detection, thermal energy harvesting, molecular sensing, and chiral imaging.
研究不足
The study notes some difference between simulated and measured absorption spectra, possibly due to sample defects such as varying gap sizes between neighboring resonators and side wall roughness from the FIB milling process, as well as the oblique incident angle through the reflective Cassegrain objective.
1：Experimental Design and Method Selection:
The study involves designing chiral plasmonic metasurface absorbers with a three-layer metal-dielectric-metal structure, including double rectangle resonators in the top gold layer. The design aims to achieve broadband infrared CD by combining multiple double-rectangle resonators of different sizes into one unit cell.
2：Sample Selection and Data Sources:
The samples are fabricated using focused ion beam (FIB) milling on a glass substrate with deposited gold and silica layers. The optical properties are measured using a Fourier transform infrared spectrometer (FTIR) connected to an infrared microscope.
3：List of Experimental Equipment and Materials:
Equipment includes a Lesker PVD250 electron beam evaporator for gold deposition, Lesker CMS18 system for SiO2 dielectric layer deposition, FEI Helios Nanolab 600 for FIB milling, and Nicolet 6700 FTIR for optical measurements.
4：Experimental Procedures and Operational Workflow:
The fabrication process involves depositing gold and silica layers on a glass substrate, followed by FIB milling to create the desired double-rectangle patterns. Optical measurements are conducted with specified circular polarizations.
5：Data Analysis Methods:
The absorption spectra under LCP and RCP incidence are simulated using COMSOL Multiphysics, RF Module, with periodic boundary conditions. The heat transfer and temperature distributions are also simulated using COMSOL Multiphysics, Heat Transfer Module.
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