Asymmetric metal grating and coating semiconductor multi-quantum-well waveguide laser

Abstract

The invention relates to the field of laser technologies and micro-nano optoelectronics and discloses an asymmetric metal grating and coating semiconductor multi-quantum-well waveguide laser. The waveguide laser comprises an upper metal grating layer (1), an active layer (2), a lower metal coating layer (3) and a substrate (4). The optical field is locally limited in the semiconductor active layer effectively through the upper metal grating layer and the lower metal coating layer. One-dimensional strip-shaped metal gratings are manufactured on the upper metal grating layer, FP-cavity-like resonance is formed in combination with local area surface plasma resonance, and thus wavelength mode can be effectively selected. The active layer is made of multi-quantum-well high-gain material, pump light is effectively absorbed and target light is sufficiently fed back through strong resonance between the pump light and the target light, and finally low-threshold laser emitting is achieved. The waveguide laser has the advantages of being capable of limiting one-dimensional sub-wavelength of light, good in unidirectionality and the like.

Description

technical field [0001] The invention belongs to the field of laser technology and micro-nano optoelectronics, in particular to an asymmetric metal grating-coated semiconductor multi-quantum well waveguide laser. Background technique [0002] In the field of optical communication, with the urgent need for on-chip photoelectric integration, people are paying more and more attention to the miniaturization of on-chip integrated light sources. Compared with high-power output lasers with low divergence angles, people began to study low-threshold compact lasers, and some progress has been made in recent years. Because of the localized nature of light well below the diffraction limit, surface plasmons offer the possibility of ultracompact lasers that can directly generate coherent light fields at the nanometer scale. Nanoscale resonators have been reported, such as: metal-coated nanopillars, metal-coated nanorings, semiconductor nanowires on silver films, and gold nanospheres, etc....

AI Technical Summary

Problems solved by technology

[0005] The invention aims to solve the technical problem of poor unidirectionality of existing subwavelength cavity lasers and microcavity lasers

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