Microdisk cavity laser containing silver sulfide/silver zinc sulfide core-shell quantum dots and preparation method thereof

Abstract

The invention discloses a microdisk cavity laser containing silver sulfide / silver zinc sulfide core-shell quantum dots and a preparation method thereof. The microdisk cavity laser comprises a siliconsubstrate, a silicon cylinder and a silicon dioxide disk containing silver sulfide / silver zinc sulfide core-shell quantum dots, arranged upward in sequence. The invention replaces the lead salt quantum dot of the lowest quantum state 8 with the silver sulfide quantum dot of the lowest toxic lowest quantum state 2 times degenerate, In order to achieve low threshold near-infrared gain, silver sulfide quantum dots were coated with silver-zinc sulfide alloy shell whose zinc content increased gradually from the inside to the outside to construct smooth interface barrier and passivate the surface ofsilver sulfide quantum dots, which can further reduce the optical gain threshold. Embedding the quantum dots into the silica can avoid the degradation of the quality factor caused by coating the quantum dots on the microdisk cavity. A low threshold, high quality factor and environmentally friendly microdisk cavity near infrared quantum dot laser can be obtained by fabricating a microdisk cavity with AgS / AgZnS core-shell quantum dot on SiO2 film.

Description

technical field [0001] The invention relates to a micro-disk cavity laser containing silver sulfide / silver-zinc sulfide 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 narrower em...

AI Technical Summary

Problems solved by technology

However, the coupling of colloidal quantum dots and microdisk cavities has not been well realized

At present, the most commonly used method is to coat quantum dots on the prepared silica microdisk cavity, which will significantly reduce the quality factor of the microdisk cavity

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