Distributed feedback laser containing silver telluride/silver telluride-zinc core-shell quantum dots and preparation method thereof

Abstract

The invention discloses a distributed feedback laser containing silver telluride / silver telluride-zinc core-shell quantum dots and a preparation method thereof. The distributed feedback laser comprises a quartz substrate and silicon dioxide periodic gratings containing silver telluride / silver telluride-zinc core-shell quantum dots, wherein the quartz substrate and the silicon dioxide periodic gratings are sequentially arranged upwards. According to the distributed feedback laser, the low-toxicity silver telluride quantum dots with the lowest quantum state being 2-fold degeneracy are used to replace lead salt quantum dots with the lowest quantum state being 8-fold degeneracy so as to achieve near-infrared optical gain with a low threshold, and the surface of each silver telluride quantum dot is coated with a silver telluride-zinc alloy shell with the zinc content gradually increasing from inside to outside so as to construct a gentle interface barrier and passivate the surface of the silver telluride quantum dots, thereby being capable of further reducing the optical gain threshold. The photothermal stability of silicon dioxide is far higher than that of an organic polymer. The periodic gratings are prepared by using a silicon dioxide film containing the silver telluride / silver telluride-zinc core-shell quantum dots, and finally an environment-friendly distributed feedback near-infrared quantum dot laser with a low threshold and high stability can be obtained.

Description

technical field [0001] The invention relates to a distributed feedback laser containing silver telluride / silver zinc telluride core-shell quantum dots and a preparation method thereof, belonging to the technical field of semiconductor optoelectronic devices. Background technique [0002] Near-infrared lasers can be widely used in fields such as optical communication, remote sensing, and coherent plasma generation. Benefiting from the quantum confinement effect, semiconductor quantum dots exhibit a variety of superior properties as optical gain materials, such as tunable emission wavelength with size, potentially low laser threshold and temperature-insensitive laser performance. At present, near-infrared quantum dot lasers prepared by molecular beam epitaxy have begun commercial applications. Compared with epitaxially grown quantum dots, colloidal quantum dots have a smaller size and a more uniform size distribution, so they have stronger quantum confinement effects and narr...

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Problems solved by technology

Organic polymers have poor photothermal stability, which affects laser stability and lifetime

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