研究目的
Investigating the design and efficiency of broadband, high-efficiency reflective wave plates (HWP and QWP) operating in the infrared region using plasmonic metasurfaces.
研究成果
The proposed designs of HWP and QWP using plasmonic metasurfaces demonstrate broadband and high-efficiency polarization conversion in the infrared region. The HWP exhibits a bandwidth of 1670–2791 nm, while the QWP shows a broader bandwidth of 1592–3867 nm. The study provides a promising pathway for the realization of sophisticated polarization conversion devices.
研究不足
The study is limited to theoretical analysis and simulation, without experimental validation. The designs are optimized for the infrared region, and their performance in other wavelength ranges is not explored.
1：Experimental Design and Method Selection:
The study involves the design of two types of reflective wave plates (HWP and QWP) using plasmonic metasurfaces composed of L-shaped antennas. Theoretical analysis and simulation using finite difference time domain (FDTD) method are employed to evaluate the feasibility and efficiency of the designs.
2：Sample Selection and Data Sources:
The designs are based on metal-insulator-metal (MIM) reflective structures with specific geometric parameters for the L-shaped antennas and dielectric spacer.
3：List of Experimental Equipment and Materials:
Silver and silica are used as materials for the antennas and dielectric spacer, respectively. The optical constants of these materials are obtained from the data of Palik and CRC.
4：Experimental Procedures and Operational Workflow:
The simulation involves setting periodic boundary conditions along the x- and y-axes and perfectly matched layer along the z-axis. The designs are evaluated based on reflection magnitudes, phase differences, polarization conversion rate (PCR), and degree of linear polarization (DoLP).
5：Data Analysis Methods:
The analysis includes calculating PCR and DoLP to evaluate the efficiency of polarization conversion. The physical mechanisms of polarization conversion are elucidated by comparing electric field distributions.
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