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Sub-wavelength mixed type surface plasma optical waveguide

A surface plasmon, sub-wavelength technology, applied in the field of optical waveguide, can solve the problems of large transmission loss, limited mode field limitation, and inability to realize long-distance optical signal transmission, and achieves low transmission loss and strong mode field limitation. Effect

Inactive Publication Date: 2012-07-11
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the dielectric / metal / dielectric optical waveguide has low transmission loss, but its poor mode field confinement ability restricts its application in high-integration optical circuits; on the other hand, the metal / dielectric / metal optical waveguide has strong Mode field limitation capability, but its transmission loss is too large, making it impossible to transmit long-distance optical signals

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  • Sub-wavelength mixed type surface plasma optical waveguide
  • Sub-wavelength mixed type surface plasma optical waveguide
  • Sub-wavelength mixed type surface plasma optical waveguide

Examples

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example 1

[0034] Example 1: The high-refractive-index dielectric region embedded in the low-refractive-index dielectric layer is an optical waveguide structure of limited width

[0035] figure 2 It is a structural diagram of the subwavelength hybrid surface plasmon optical waveguide described in Example 1. 201 is the metal base layer, n m is its refractive index; 202 is the low refractive index medium region, n l is its refractive index, h l is its height; 203 is the high-refractive-index dielectric region embedded in the low-refractive-index layer, n i is its refractive index, w i is its width, h i is its height; 204 is the high-refractive-index dielectric region located on the low-refractive-index dielectric layer, n h is its refractive index, w h is its width, h h Its height, the minimum distance from the lower edge of 204 to the upper edge of 203 and the minimum distance from the lower edge of 203 to the upper surface of 201 are both h g , w h is its width, h h is its he...

example 2

[0043] Example 2: The high-refractive-index dielectric region embedded in the low-refractive-index dielectric layer is an optical waveguide structure of infinite width

[0044] Figure 7 It is a structural diagram of the subwavelength hybrid surface plasmon optical waveguide described in Example 2. 701 is the metal base layer, n m is its refractive index; 702 is the low refractive index medium region, n l is its refractive index, h l is its height; 703 is the high-refractive-index medium region embedded in the low-refractive-index layer, n i is its refractive index, h i is its height; 704 is the high-refractive-index dielectric region located on the low-refractive-index dielectric layer, n h is its refractive index, w h is its width, h h For its height, the minimum distance from the lower edge of 704 to the upper edge of 703 and the minimum distance from the lower edge of 703 to the upper surface of 701 are both h g , w h is its width, h h is its height; 705 is the c...

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Abstract

The invention discloses a mixed type surface plasma optical waveguide with a sub-wavelength optical field limit capacity. The cross section of the waveguide structure comprises a metal basement layer (1), a low-refractive-index dielectric layer (2), a high-refractive-index dielectric area (3), a high-refractive-index dielectric area (4) and a cladding (5), wherein the low-refractive-index dielectric layer (2) is positioned on the metal basement layer, the high-refractive-index dielectric area (3) is inlaid in the low-refractive-index dielectric layer, and the high-refractive-index dielectric area (4) is positioned on the low-refractive-index dielectric layer (2). The metal basement layer (1) and the high-refractive-index dielectric area (4) close to the metal basement layer (1) can limit an optical field in the low-refractive-index dielectric layer (2). Meanwhile, as the high-refractive-index dielectric area (3) exists, the distribution range of optical fields can be further shrunk, and the sub-wavelength restriction for transmission optical fields is realized. The optical waveguide structure further increases the mode field limit capacity of the traditional mixed type waveguide, meanwhile keeps lower transmission loss, and provides probability for the realization of an optical waveguide chip with an ultrahigh integrated level.

Description

technical field [0001] The invention relates to the technical field of optical waveguides, in particular to a subwavelength hybrid surface plasmon polariton optical waveguide. Background technique [0002] Surface plasmon optical waveguide technology has attracted extensive attention from experts and scholars at home and abroad in recent years, and has become an emerging research field of nanophotonics. Surface plasmon polaritons are non-radiative electromagnetic waves formed by the mutual coupling of free electrons on metal surfaces and incident photons. mode, which is a mixed excited state propagating locally on the metal and dielectric surfaces. This mode exists near the interface between the metal and the medium, and its field strength reaches the maximum at the interface and decays exponentially along the direction perpendicular to the interface on both sides of the interface. Surface plasmons have strong field confinement properties, which can confine the field energy...

Claims

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Application Information

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IPC IPC(8): G02B6/122
Inventor 郑铮卞宇生赵欣刘磊苏亚林刘建胜
Owner BEIHANG UNIV