研究目的
To fabricate and characterize subwavelength bilayer metal wire grid polarizers on flexible plastic substrates using nanoimprint lithography and aluminum deposition, aiming to achieve high transmission efficiency and extinction ratio in the visible range for applications in optics.
研究成果
The fabricated subwavelength bilayer metal wire grid polarizers exhibit high performance with transmission >0.55 and extinction ratio >32 dB in the visible range, and low polarization error in sensor tests. This provides a foundation for developing polarizers with compound eye structures and demonstrates the method's potential for optical applications.
研究不足
The fabrication process may have deviations due to natural oxide layers on aluminum, distorted wire profiles, surface roughness, and pattern defects, which were not fully accounted for in simulations. The method's applicability is primarily for optics and may have constraints in other fields.
1：Experimental Design and Method Selection:
The study uses nanoimprint lithography and aluminum deposition to fabricate polarizers on polycarbonate substrates, with performance characterization through transmission measurements and polarization analysis. Rigorous coupled wave theory (RCWT) is employed for simulations.
2：Sample Selection and Data Sources:
Samples are fabricated with a period of 278 nm, linewidth of 139 nm, height of 110 nm, and aluminum thickness of 70 nm. Data is collected from transmission spectra and polarization tests using a six-channel sensor.
3：List of Experimental Equipment and Materials:
Includes silicon grating templates (Shanghai Nateng), NIL-50 instrument (Shanghai Nateng), trichlorosilane anti-sticking monolayer (Sigma-Aldrich), polycarbonate substrates, aluminum for deposition, xenon lamp light source, Evans fiber spectrometer, Arduino ADC (2560), and Matlab for data analysis.
4：Experimental Procedures and Operational Workflow:
Template surface treatment with anti-sticking monolayer, thermal nanoimprint at 160°C and 0.65 MPa pressure for 5 min, aluminum deposition, transmission measurement setup with light source and spectrometer, polarization calibration using a six-channel sensor.
5：65 MPa pressure for 5 min, aluminum deposition, transmission measurement setup with light source and spectrometer, polarization calibration using a six-channel sensor.
Data Analysis Methods:
5. Data Analysis Methods: Transmission efficiency and extinction ratio calculated from measured transmittance, polarization error analyzed using Matlab, simulations compared with experimental results.
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