研究目的
Investigating the efficiency of a sharply bent waveguide with a microcavity constructed by an air-bridge type two-dimensional photonic crystal slab.
研究成果
The optical power was transmitted efficiently to the output waveguide due to resonant tunneling caused by the microcavity. The transmission loss was found to be caused by the radiation into the air cladding layer in the microcavity.
研究不足
The transmission loss of the bent waveguide is primarily due to the losses in the microcavity, mainly caused by the radiation into the air in the y?direction.
1：Experimental Design and Method Selection:
The study uses the three-dimensional finite difference time domain (FD-TD) method to analyze the waveguide. The computational zone is surrounded by perfectly matched layers (PMLs) for absorbing boundary conditions.
2：Sample Selection and Data Sources:
The waveguide is constructed on a silicon-on-insulator (SOI) substrate, with a two-dimensional photonic crystal formed in the silicon layer.
3：List of Experimental Equipment and Materials:
The photonic crystal is composed of circular air-holes with radius ra having a triangular array with lattice constant a. The relative permittivity of silicon εa is 11.9 for infrared light.
4：9 for infrared light.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The waveguide is formed by removing one row of air-holes, and the microcavity structure is formed by removing seven air-holes and modifying the radius rb and the displacement d of the position of twelve air-holes surrounding the microcavity.
5：Data Analysis Methods:
The dispersion relation of the straight photonic crystal waveguide is calculated, and the optical power transmission spectra of the bent waveguide are analyzed.
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