A vertical cavity surface emitting laser containing cadmium sulfide/zinc sulfide core-shell quantum dots and its manufacturing method

Abstract

The invention relates to a vertical cavity surface-emitting laser containing cadmium sulfide / zinc sulfide core-shell quantum dots, which can realize Ultra-low threshold optical gain, in which the surface state of cadmium sulfide quantum dots (4‑2‑1) is isolated from the external environment by applying a zinc sulfide shell (4‑2‑2), which can improve the stability of the surface state; The main silica layer (4) containing cadmium sulfide / zinc sulfide core-shell quantum dots is "sandwiched" between two high-reflection mirrors, and finally a vertical cavity surface with ultra-low threshold, high stability and high quality factor can be obtained Emitting the quantum dot laser can effectively improve the working efficiency of the designed laser; at the same time, the present invention designs a manufacturing method for this laser, which can improve the manufacturing process standard of the designed vertical cavity surface emitting laser and ensure the stability of the laser.

Description

technical field [0001] The invention relates to a vertical cavity surface emitting laser containing cadmium sulfide / zinc sulfide core-shell quantum dots and a manufacturing method thereof, belonging to the technical field of semiconductor optoelectronic devices. Background technique [0002] Benefiting from the quantum confinement effect, semiconductor quantum dots, as optical gain materials, exhibit a variety of superior properties, such as tunable emission wavelength with size, potentially low laser threshold and temperature-insensitive laser performance. However, due to the existence of ground state absorption, in order to achieve optical gain in the band edge state of quantum dots, the number of excitons (absorbed photons) must be greater than half of the degeneracy of the lowest quantum state (the number of electrons that can be accommodated). This limits the threshold of quantum dot lasers, making it difficult to achieve continuous optical or electrical pumping. [00...

AI Technical Summary

Problems solved by technology

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

At present, the most commonly used method is to spin-coat an organic polymer film containing quantum dots on the lower high-reflective mirror, and then deposit the upper high-reflective mirror on the polymer film to form a Fabry-Perot cavity. It is difficult to obtain a resonant cavity with a high quality factor due to the large difference in expansion coefficient from the inorganic high-reflection mirror material

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