Surface plasmon laser of semiconductor nanowire-metal film structure

Abstract

The invention relates to a surface plasmon laser of a semiconductor nanowire-metal film structure, which mainly consists of a solid semiconductor nanowire, a hollow semiconductor nanowire, quantum dots and a metal film. The surface plasmon laser is of the semiconductor nanowire-metal film structure densely provided with the quantum dots, the semiconductor nanowire emits high-frequency laser under external excitation, the high-frequency laser is absorbed by the quantum dots on the surface of the nanowire, and low-frequency light is radiated, thus the wavelength of the laser is modulated, and a surface plamon mode is excited on the surface of the metal film. A plurality of light emitting peaks can be obtained to form a wide-spectrum light source by changing the radius, the surface shape, the materials and the like of the quantum dots. Compared with the traditional nano-quantum lasers, the surface plasmon laser disclosed by the invention obtains excellent nano-scaled coherent light, can also adjust the wavelength of output laser and has the advantages of small size, high light density, wavelength adjustment, wide-spectrum gain and the like.

Description

technical field [0001] The invention belongs to the field of nano optics and relates to a surface plasmon laser. Background technique [0002] The field of laser science has been able to develop coherent light sources with high power, high speed and small size. Current microlasers have been able to approach or reach the optical diffraction limit, such as microlasers based on photonic crystals, metal-clad cavities, and semiconductor microwires. However, these lasers are all micron-scale lasers, which are limited by the traditional optical diffraction limit. The laser spots are all on the order of wavelength, and both the size of the optical field mode and the size of the physical device exceed the half-wavelength of the optical field. In order to further improve the integration of lasers and provide light sources for future nanoscale integrated optical chips, researchers began to study lasers with nanoscale spots. [0003] There are currently two approaches to making nanosc...

AI Technical Summary

Problems solved by technology

In the high-frequency visible light band, metals have high ohmic losses, and it is difficult to achieve the threshold conditions required for laser excitation. Therefore, it is difficult to realize high-quality sub-wavelength nanolasers by using semiconductor nanowires as gain media. The nano-laser resonance effect in the long-wave visible and infrared bands cannot meet the actual needs of the future nano-optical communication field.

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