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T-shaped polarization beam splitter with photonic crystal waveguide

A photonic crystal waveguide and polarization beam splitter technology, applied in the coupling of optical waveguides, light guides, instruments, etc., to achieve the effects of small structure size, high polarization degree, and high light transmission efficiency

Inactive Publication Date: 2012-08-29
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polarizing beam splitter obtained by these two methods, although its volume is much smaller than the traditional polarizing beam splitter, it still appears relatively large

Method used

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  • T-shaped polarization beam splitter with photonic crystal waveguide
  • T-shaped polarization beam splitter with photonic crystal waveguide
  • T-shaped polarization beam splitter with photonic crystal waveguide

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Embodiment Construction

[0035] The dielectric material in the introduction of the principle of the present invention and in the specific implementation mode is all taken as an example of a tellurium dielectric column. Tellurium is a positive uniaxial crystal, n o =4.8, n e =6.2, when the e optical axis is in the same direction as the dielectric column axis, the photon forbidden band can be obtained through the development of the plane wave spread. When the photonic crystal is a square lattice, the lattice constant is , when the radius is 0.3568a, its photonic band gap is 3.928 to 4.550 ( ), light waves of any frequency in between will be confined in the waveguide.

[0036] The present invention introduces point defects into the waveguide, so that the point defects have different equivalent refractive indices for light waves of different polarization states, and then determines the point defect parameters that meet the total reflection of a single polarization state and the total transmiss...

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Abstract

The invention discloses a T-shaped polarization beam splitter with a photonic crystal waveguide. The T-shaped polarization beam splitter comprises the photonic crystal waveguide with a complete forbidden band. After incident waves in any polarization directions are input to the polarization beam splitter by the input end of the photonic crystal waveguide, a transverse electric (TE) component is output from a TE output end, whereas a transverse magnetic (TM) component is output from the TM output end of the beam splitter. The T-shaped polarization beam splitter disclosed by the invention is small in structural size, high in degree of polarization, high in optical transmission efficiency, convenient in integration and high in efficiency and is suitable for integrating optical paths on a large scale, and the function of different-wavelength polarization beam splitting can be realized.

Description

[0001] technical field [0002] The invention relates to the field of tiny optical polarization beam splitters, in particular to a tiny optical polarization beam splitter based on photonic crystal technology. Background technique [0003] Traditional polarizing beam splitters are bulky and cannot be used in optical path integration. Microscopic devices, including polarization beam splitters, can be fabricated on the basis of photonic crystals. There are currently two methods: one is to use a photonic crystal with TE forbidden band and TM conduction band or TM forbidden band and TE conduction band to realize the polarization separation of waves. This kind of polarization beam splitter can only be used as a single photonic crystal device in traditional optical waveguides due to its poor transmittance and polarization degree, and it is difficult to integrate into other photonic crystal devices. The other is to couple light waves with different polarization states to d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B6/27G02B6/126G02B6/122
CPCG02B6/1225G02B6/2773G02B2006/1215G02B1/005B82Y20/00G02B6/126
Inventor 欧阳征标金鑫
Owner SHENZHEN UNIV
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