研究目的
To study the influence of symmetry and coupling between TE and TM polarizations on bound states in the continuum (BICs) in a bilayer photonic crystal and to explore the emergence of BIC states in the presence of TE-TM coupling.
研究成果
The study demonstrates the emergence of high-Q-factor BIC states in a bilayer photonic crystal slab with broken mirror-flip symmetry in the z direction and enhanced TE-TM coupling. These BIC states exhibit unique spatial characteristics and can be selectively excited at different layer locations. The findings suggest potential applications in manipulating BIC states in structured photonic platforms for loss-immune communication, lasing, and sensing.
研究不足
The study focuses on the theoretical design and analysis of a bilayer photonic crystal slab. Experimental validation and practical implementation of the proposed design are not covered. The study also does not explore the effects of material losses or fabrication imperfections on the BIC states.
1：Experimental Design and Method Selection:
The study involves designing a bilayer photonic crystal slab with C3v symmetry in the x-y plane and broken mirror-flip symmetry in the z direction. The finite element method (FEM) is used to solve the electromagnetic field equations.
2：Sample Selection and Data Sources:
The bilayer photonic crystal slab is made of silicon with a permittivity of 11.7 and lattice constant a of 1500 nm. The layers are fabricated by engraving periodic holes on a silicon material and wet etching to suspend the structure in air.
3：7 and lattice constant a of 1500 nm. The layers are fabricated by engraving periodic holes on a silicon material and wet etching to suspend the structure in air.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Silicon material for the photonic crystal slab, wet etching equipment for fabrication.
4：Experimental Procedures and Operational Workflow:
The pump light impinges on the bilayer photonic crystal slab and spreads through the slab. The symmetry in the x-y plane is adjusted by rotational and translational operations, while the mirror-flip symmetry in the z direction is broken.
5：Data Analysis Methods:
The complex eigenfrequencies of the electromagnetic field equations are analyzed to measure the lifetimes of the corresponding resonator modes and the Q factors of the BIC states.
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