Photonic crystal waveguide orthogonal split mode interference FANO resonant structure

Abstract

The invention discloses a photonic crystal waveguide orthogonal split mode interference FANO resonant structure. The structure comprises a two-dimensional photonic crystal linetype waveguide composedof a plurality of dielectric cylinders with the refractive index, the two-dimensional photonic crystal linetype waveguide comprises two waveguide ports and one point defect resonant cavity, wherein the two waveguide ports are arranged on the two sides of the point defect resonant cavity respectively. The point defect resonant cavity comprises four dielectric cylinders and one point defect dielectric cylinder with the cross section long side being perpendicular to a waveguide axis and the length-width ratio being 2.4-2.6. Two dielectric cylinders are symmetrically arranged on the two sides of the point defect dielectric cylinder respectively, and the centers of the four dielectric cylinders and the point defect dielectric cylinder are distributed and arranged at equal intervals. The structure provided by the invention is compact, bright mode and dark mode of Fano resonance can be conveniently controlled, and Fano resonance is easy to achieve integration with other photonic crystal devices.

Description

technical field [0001] The invention relates to the field of photonic crystal point defect mode distribution and Fano resonance, in particular to a Fano resonance structure caused by interference of photonic crystal waveguide orthogonal splitting modes. Background technique [0002] In recent years, photonic crystals have always been a hot field for people to study optical devices. Photonic crystals are crystal structures composed of materials with different dielectric constants arranged in periodic lattices. When the electromagnetic wave propagates in the photonic crystal, the Bragg scattering causes the electromagnetic wave to be modulated to form an energy band structure, and the electromagnetic wave in the forbidden band cannot propagate at all. The introduction of defects into photonic crystals can realize the guidance and control of electromagnetic waves, and thus various devices with different functions can be obtained, such as photonic crystal lasers, filters, senso...

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Problems solved by technology

However, the existing literature reports that the construction of controllable photonic crystal Fano resonance requires the use of complex asymmetric structures for limited adjustment

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