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Two-dimensional complete band gap photon crystal polarization and depolarization beam splitter

A depolarization beam splitting and photonic crystal technology, which is applied in the field of optoelectronics to overcome the requirements of the manufacturing process, has a simple structure and is easy to optically integrate.

Inactive Publication Date: 2008-02-20
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The depolarization beam splitter is a device that decomposes an incident unpolarized electromagnetic wave into two beams with the same light intensity ratio. At present, it is realized by using a beam splitter. The photonic crystal depolarization beam splitter has not been reported yet.

Method used

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  • Two-dimensional complete band gap photon crystal polarization and depolarization beam splitter
  • Two-dimensional complete band gap photon crystal polarization and depolarization beam splitter

Examples

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Effect test

Embodiment 1

[0018] Take the hexagonal honeycomb structure shown in Figure 1, the background is air, the lattice constant is a, the relative permittivity ε of the silicon-Si dielectric cylinder is taken as 11.38, the radius of the dielectric cylinder is about 0.15a, and the input waveguide and output waveguide are composed of 2 rows Dielectric rod defects are formed, and the distance between two parallel waveguides in the coupling area is 2 rows of dielectric rods. When the coupling action length zone is 80a and the normalized frequency of the incident light wave ωa / 2πc = 0.9743, it can be used in a polarization beam splitter, ω is the frequency of the light wave, c is the speed of light in vacuum, and the field distributions corresponding to the TE and TM modes As shown in Figure 2.

Embodiment 2

[0020] Take the hexagonal honeycomb structure shown in Figure 1, the background is air, the lattice constant is a, the relative permittivity ε of the silicon-Si dielectric cylinder is taken as 11.38, the radius of the dielectric cylinder is about 0.15a, and the input waveguide and output waveguide are composed of 2 rows Dielectric rod defects are formed, and the distance between two parallel waveguides in the coupling area is 2 rows of dielectric rods. When the length of the coupling action zone is 30a and the normalized frequency of incident light wave ωa / 2πc=0.822, it can be used for depolarization beam splitter, ω is the frequency of light wave, c is the speed of light in vacuum, and the fields corresponding to the TE and TM modes The distribution is shown in Figure 3.

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Abstract

The utility model provides a beam splitter of two-dimensional complete bandgap photon crystalloid polarization and depolarization. The distributing of the crystalloid lattice of the photon crystalloid is shaped like hexagonal beehive. The photon crystalloid is composed of an input wave-guide and two output wave-guides; a parallel coupling effect area is arranged between the input wave-guide and the output wave-guide; the exit end of the coupling area is connected with the output wave-guides via the kinked wave-guide. Both of the input and output wave-guides comprise two rows of dielectric bar drawback, and the distance between the two parallel wave-guides of the coupled area is one to three rows dielectrics sticks. With the complete photon bandgap, the utility model has the obvious advantages that the polarization beam splitting and the depolarization beam splitting are realized, the size is small and the splitter is easy to integrate.

Description

(1) Technical field [0001] The invention relates to a light wave beam splitter, which belongs to the technical field of optoelectronics. (2) Background technology [0002] Photonic Crystal (Photonic Crystal) is a structure in which the dielectric is periodically distributed. It is characterized by the existence of a photonic frequency forbidden band. Light with a frequency within the photonic frequency forbidden band cannot be transmitted in the photonic crystal, but it can be arbitrarily controlled by introducing defects The flow of light waves. Compared with traditional waveguide devices, photonic crystal functional devices have important application prospects due to their rich optical characteristics, such as the use of photonic crystals to make mirrors, antennas, optical switches, optical amplifiers, optical waveguides, microcavities, and thresholdless Lasers, etc.; there are commercial large-core photonic crystal single-mode fibers, air-hole microstructure fibers, highly non...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/27G02B6/26G02B6/02
Inventor 关春颖史金辉苑立波
Owner HARBIN ENG UNIV
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