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Low-threshold-value surface plasma laser device

A technology of surface plasmons and lasers, applied in the structure of optical waveguide semiconductors, etc., can solve the problems of unable to balance the mode field limitation ability and transmission loss, and achieve the effect of low transmission loss

Inactive Publication Date: 2012-07-04
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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  • Low-threshold-value surface plasma laser device
  • Low-threshold-value surface plasma laser device
  • Low-threshold-value surface plasma laser device

Examples

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example

[0033] figure 2 is the cross-sectional structure diagram of the low-threshold surface plasmon laser described in the example. 201 is the base layer, n s Its refractive index; 202 is the metal area, its width is w m , with height h m , n m Its refractive index; 203 is the low refractive index medium layer, n b Its refractive index, its thickness is t; 204 is the gain medium area, n h is its refractive index, w h its width, h h Its height; 205 is the cladding, n cis its refractive index; the longitudinal (along the Z-axis direction) length of 202, 203 and 204 is L.

[0034] In this example, the wavelength of the laser output light is 490nm, the material of 201 and 203 is magnesium fluoride, the real part of its refractive index is 1.4; the material of 202 is silver, and the real part of the refractive index at 490nm wavelength is -9.2, The imaginary part is 0.3; the material of 204 is cadmium sulfide, and the real part of the refractive index is 2.4; the material of 20...

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Abstract

The invention discloses a low-threshold-value surface plasma laser device comprising a base layer (1), a metal area (2) located above the base layer (1), a medium buffering layer (3) for covering the base layer and the metal area, a gain medium area (4) on the medium buffering layer and a covering layer (5). The gain medium area not only can be used for limiting a large part of a light field, butalso the coupling of the gain medium area and the metal area can obviously restrain the light field in low-refractive-index medium layers at two sides of the metal area; and meanwhile, a lower transmission loss can be kept. The surface plasma laser device provided by the invention has a lower work threshold value and is easy to realize, so that the surface plasma laser device can be used for constructing various integrated nano active devices.

Description

technical field [0001] The invention relates to the field of micro-nano photonic devices / lasers, in particular to a low-threshold surface plasmon laser. Background technique [0002] 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 meet the two conditions of low-loss transmission and strong field confinement capability in the gain medium region, and this is the problem that traditional surface plasmon optical waveguides cannot overcome. [0003] The latest resea...

Claims

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Application Information

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