Cross connecting rod column and cylinder based large absolute forbidden band square lattice photonic crystal

Abstract

The invention discloses a cross connecting rod column and cylinder based large absolute forbidden band square lattice photonic crystal. The cross connecting rod column and cylinder based large absolute forbidden band square lattice photonic crystal comprises dielectric cylinders with high refractive index and background dielectric cylinders with low refractive index; panel dielectric cylinder cross connecting rods which are arranged in the cross direction and circular dielectric cylinders are connected to form into the dielectric cylinders with the high refractive index; the lattice constant of the square lattice is a; the width of the panel dielectric cylinders is 0.0558a; the semi-diameter of the cylinders is 0.31392a; the comparative value of the largest absolute forbidden band is 17.26755%. The photonic crystal has the advantages of belonging to the square lattice and being easy to achieve connection and coupling between different optical elements in an optical path and different optical paths and beneficial to reduction of costs, being large in absolute forbidden band and widely applied to large-scale integration optical path design.

Description

technical field [0001] The invention relates to a two-dimensional photonic crystal with wide absolute forbidden band. Background technique [0002] In 1987, E. Yablonovitch of Bell Laboratories in the United States was discussing how to suppress spontaneous emission, and S. John of Princeton University was discussing the photonic region and independently proposed the concept of photonic crystal (Photonic Crystal). A photonic crystal is a material structure in which dielectric materials are periodically arranged in space, and is usually an artificial crystal composed of two or more materials with different dielectric constants. [0003] In the frequency domain, for TE or TM waves propagating in any direction, the frequency interval where the electromagnetic field density of states is zero is defined as the TE or TM complete band gap of the photonic crystal, and the frequency interval where both TE and TM are completely forbidden is called a photonic crystal absolute ban. De...

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Problems solved by technology

[0005] Traditionally, in order to obtain a large relative forbidden band, non-square lattice structures such as triangular lattice and hexagonal lattice need to be used. However, in the integrated optical path of photonic crystals, the use of square lattice structure can make the optical path simple and easy to provide Integration, while the absolute band gap of the traditional square lattice photonic crystal is very small, so the formation of a square lattice photonic crystal with a large absolute band gap is the goal that people have been pursuing.

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