研究目的
Investigating the performance of a liquid crystal tunable filter based on subwavelength gratings reflector for applications in dense wavelength division multiplexing (DWDM) systems and all-optical networks.
研究成果
The proposed LC tunable filter based on SWGs achieves a wide tuning range of 60 nm and a FWHM less than 1nm, making it a promising candidate for OEIC, PIC, and DWDM applications due to its ultra-minimum size and performance.
研究不足
The actual simulation shows the tuning range is 60 nm, which is less than the theoretical free spectral range (FSR) of 150 nm. The high reflection area of SWGs is only 20nm, limiting the tuning range.
1：Experimental Design and Method Selection:
The filter is designed as a F-P microcavity consisting of distributed Bragg reflector (DBRs) and a subwavelength gratings (SWGs) which acts as a high reflector and alignment layer for LC molecules.
2：Sample Selection and Data Sources:
The filter uses nematic LC (E7) filled in a cavity structured by SWGs reflector and DBRs reflector.
3：List of Experimental Equipment and Materials:
The DBRs reflector is composed of 4 pairs of Si/Sio2, and the SWGs reflector consists of 40 periods of silicon.
4：Experimental Procedures and Operational Workflow:
The filter's performance is analyzed through simulation, focusing on reflectivity, tuning range, and linewidth.
5：Data Analysis Methods:
Rigorous coupled wave analysis (RCWA) method is used to calculate the reflectivity as a function of the grating period, bar width, and wavelength.
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