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Sub-wavelength surface plasma laser

A surface plasmon and laser technology, which is applied to the structure of optical waveguide semiconductors and other directions, can solve the problems of inability to balance mode field confinement capability and transmission loss.

Inactive Publication Date: 2013-09-18
BEIHANG UNIV
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Problems solved by technology

The waveguide structure overcomes the problem that the traditional surface plasmon optical waveguide structure cannot balance the two physical quantities of mode field confinement capability and transmission loss

Method used

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  • Sub-wavelength surface plasma laser
  • Sub-wavelength surface plasma laser
  • Sub-wavelength surface plasma laser

Examples

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example

[0034] figure 2 is the cross-sectional structure diagram of the subwavelength surface plasmon laser described in the example. 201 is the metal base, n m Its refractive index, the inner vertex angle of the "∧"-shaped area is θ, and the height of the "∧"-shaped area is h m ; 202 is the medium buffer layer, n b is its refractive index, h is its thickness; 203 is a circular gain medium nanotube, n g is its refractive index, w 3 its width, h 3 Its height; 204 is the filling area in the center of the gain medium nanotube, n 1 is its refractive index, w 4 its width, h 4 Its height; 205 is the cladding, n c is its refractive index; the longitudinal (along the Z-axis direction) length of 201, 202, 203 and 204 is L.

[0035] In this example, the wavelength of the laser output light is 490nm, the material of 201 is silver, the real part of the refractive index at the wavelength of 490nm is -9.2, and the imaginary part is 0.3; the material of 203 is cadmium sulfide, and the real...

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Abstract

The invention discloses the structure of a sub-wavelength surface plasma laser, which comprises an inverted V-shaped (or V-shaped) a metal substrate (1), a medium buffer layer (2) on the metal substrate, a gain medium nanotube on the medium buffer layer, filling regions (3 and 4) in the center of the gain medium nanotube, and a cladding (5). The coupling between the gain medium nanotube and the metal substrate can remarkably limit an optical field in the medium buffer layer, so as to achieve two-dimensional sub-wavelength restraint of the optical field output by the laser, and meanwhile, a low-refracting-index packing layer in the center of the gain medium nanotube is helpful to keep lower dissipation. The properties of the laser can be adjusted and controlled by selecting the size of the apex angle of the metal substrate, so as to meet the requirements of practical application.

Description

technical field [0001] The invention relates to the field of micro-nano photonic devices / lasers, in particular to a subwavelength surface plasmon laser. Background technique [0002] The combination of surface plasmon technology and laser technology has become a major research hotspot today. Surface plasmon is an electromagnetic wave mode caused by the interaction between light and free electrons on the metal surface. The structure based on surface plasmon can confine the transverse light field to a size range much smaller than the wavelength, thereby breaking through the limitation of the diffraction limit. Many researchers are working on the miniaturization of laser components by taking advantage of the fact that surface plasmons break through the diffraction limit. However, in order to reduce the operating threshold of the laser, it is necessary to satisfy the two conditions of low-loss transmission and strong field confinement capability of the gain medium region, which...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/20
Inventor 郑铮卞宇生赵欣苏亚林刘磊刘建胜
Owner BEIHANG UNIV
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