Silver telluride/silver telluride zinc core-shell quantum dot-contained vertical cavity surface emitting laser and fabrication method thereof

Abstract

The invention discloses a silver telluride / silver telluride zinc core-shell quantum dot-contained vertical cavity surface emitting laser and a fabrication method thereof. The vertical cavity surface emitting laser comprises a quartz substrate, a lower high-reflection mirror, a silver telluride / silver telluride zinc core-shell quantum dot-contained silicon dioxide layer and an upper high-reflectionmirror which are sequentially and upwards arranged. Low-threshold near-infrared light gain is achieved by employing low-toxicity lowest quantum-state double degenerated silver telluride dot to substitute lowest quantum-state eightfold degenerated lead salt quantum dot, a smooth interface barrier is built and a surface of the silver telluride quantum dot is passivated by coating the surface of thesilver telluride quantum dot with a silver telluride zinc alloy shell of which the content of a zinc element is gradually increased from inside to outside, and the light gain threshold can be furtherreduced; and a silver telluride / silver telluride zinc core-shell quantum dot-contained silicon dioxide thin film is sandwiched between the two high-reflection mirrors, so that the environmental-friendly vertical cavity surface emitting near-infrared quantum-dot laser with a low threshold and a high quality factor can be finally obtained.

Description

technical field [0001] The invention relates to a vertical cavity surface emitting 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 effe...

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Problems solved by technology

Due to the large difference in expansion coefficients between organic polymers and inorganic high-mirror materials, it is difficult to obtain resonant cavities with high quality factors

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