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An ultra-small broadband polarizing beam splitter based on double-slit interference

A polarization beam splitter and double-slit interference technology, applied in the field of nanophotonics

Inactive Publication Date: 2017-02-22
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the limitation of the resonant cavity effect, this polarizing beam splitter can only work at a single wavelength

Method used

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  • An ultra-small broadband polarizing beam splitter based on double-slit interference
  • An ultra-small broadband polarizing beam splitter based on double-slit interference
  • An ultra-small broadband polarizing beam splitter based on double-slit interference

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Embodiment Construction

[0022] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0023] Such as figure 1 As shown, the ultra-small broadband polarizing beam splitter based on double-slit interference in this embodiment includes: a metal film 3, a first slit 1, a second slit 2, and a dielectric film 4; wherein, the thickness of the metal film is t M , set the first slit and the second slit on the metal film, the distance between them is d, and the width is w 1 and w 2 ;The dielectric film covers the metal film, the first slit and the second slit, and the thickness of the dielectric film is t I ; Above the dielectric film is air, thus forming a composite waveguide of air-dielectric-metal. The material of the metal film is gold or silver; the material of the dielectric film is one of polymer, crystal, glass, semiconductor and liquid film.

[0024] The air-dielectric-metal composite waveguide supports both TM and TE waveguide ...

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Abstract

The invention discloses an ultra-miniature broadband polarization beam splitter based on two-slit interference. A medium thin film covers a metal two-slit structure; when an incident light irradiates the metal two-slit structure from the back, each slit is capable of activating a TM mode and a TE mode supported by an air-medium-metal composite waveguide; the total field intensity of the waveguide mode in each direction is the coherent superposition of the separately activated modes of two slits; because two slits are different in width, the interference state in the opposite direction can be opposite and the oriented activation of the waveguide mode can be realized; further, the composite waveguide has great modal dispersion, two polarization modes perpendicular to each other can be propagated along the opposite direction and the polarization beam splitting is realized. A ultra-miniature polarization beam splitter is realized on the metal two-slit structure; the two-slit interference is capable of regulating field distribution in a metal nano structure, is important to the nano surface plasmon polariton devices and is important to an integrated loop.

Description

technical field [0001] The invention relates to the field of nanophotonics, in particular to an ultra-small broadband polarization beam splitter based on double-slit interference. Background technique [0002] Polarization is an important property of light, and a polarizing beam splitter is an important component of an optical system, which can split the incident light into two separate beams of linearly polarized light whose polarization directions are perpendicular to each other. With the continuous development of microfabrication technology and integrated optics, the miniaturization and integration of devices has become more and more important, especially in the field of highly integrated photonic circuits and optical quantum computing. Surface plasmons, which are transverse magnetic (TM) waves propagating along metal surfaces, provide a new avenue for the miniaturization of photonic devices because they can break the diffraction limit. In recent years, many polarization...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B5/30
CPCG02B5/3041G02B5/305G02B27/283
Inventor 陈建军孙成伟李洪云龚旗煌
Owner PEKING UNIV
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