研究目的
Investigating the design and fabrication of nanostructure-based polarization and wavelength filters for the discrimination of cloud thermodynamic phase (ice/water composition) in atmospheric science.
研究成果
Preliminary experimental results show that measurement of scattered sunlight from clouds, involving comparison of different polarization and wavelengths channels in the near infrared, can distinguish cloud thermodynamic phase. An optimized nanostructure-based filter array is in development to facilitate single-shot realization of these measurements.
研究不足
Some parameters (e.g. etch depth, gold thickness) deviate slightly from the intended design, leading to somewhat degraded performance. Optimization of the fabrication process is in progress.
1：Experimental Design and Method Selection:
Simulation of the nanostructure optical characteristics and optimization of the device design are performed using Rigorous Coupled-Wave Analysis (RCWA). The design process takes into account form-birefringence, surface plasmon-polariton resonances, and a Fabry-Perot cavity effect.
2：Sample Selection and Data Sources:
The nanostructured filters are fabricated using standard lithography, metal electron-beam evaporation, lift-off, and dry etching processes.
3：List of Experimental Equipment and Materials:
Metal-coated subwavelength-period silicon gratings.
4：Experimental Procedures and Operational Workflow:
Fabrication of test arrays of four adjacent devices with four different grating orientations (0°, 45°, 90° and 135°).
5：Data Analysis Methods:
Characterization of the fabricated device using a white-light source and spectrometer.
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