Positioning method and device of self-organizing single quantum dot

Abstract

The invention discloses a positioning method and a device of a self-organizing single quantum dot. The device comprises a laser, an ultraviolet light source device, a microobjective and a spectrograph, wherein the laser is used for generating exciting light and arouses a quantum dot in a quantum dot sample to produce a fluorescent light beam. The ultraviolet light source device is used for generating ultraviolet light and conducting photoresist exposure on a microcell of a single quantum dot. The microobjective is used for converging exciting light and ultraviolet light to the microcell of the surface of a sample of the single quantum dot, and collecting the florescence light beam of the quantum dot of the microcell, and also used for scanning the surface of the sample. The spectrograph is used for representing the ultraviolet light beam and obtaining florescence spectrum. The method includes that scanning is stopped after a split spectral line corresponding to the single quantum dot is found in the fluorescent spectrum, and the ultraviolet light is opened to conduct photoresist exposure on the microcell of the surface of the sample of the single quantum dot to position the single quantum dot. The positioning method and the device of the self-organizing single quantum dot avoid blindness of planar array domain process on positioning of the microcell of the single quantum dot, achieve the aim that the single quantum dot is accurately positioned in a former position, and improve rate of finished products of a single photon source component.

Description

technical field [0001] The invention relates to the field of quantum information, in particular to a positioning method and device for self-organized single quantum dots. Background technique [0002] Quantum information technology based on encoding the quantum state (such as polarization, spin) of a single quantum (such as photon, electron) has advantages over traditional information technology in terms of integration scale, processing speed, power consumption and information security. Single photon source is one of the three core technologies in the field of quantum information (single photon source, quantum encoding and transmission, and single photon detection). [0003] Low density (1~10 / μm 2 ) Self-organized indium arsenic quantum dot samples can isolate single quantum dot micro-regions through later processes to achieve stable and efficient single-photon emission in the near-infrared (900-1500nm) band; The preparation of photon source devices still adopts the tradit...

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Problems solved by technology

[0003] Low density (1~10 / μm 2 ) Self-organized indium arsenic quantum dot samples can isolate single quantum dot micro-regions through later processes to achieve stable and efficient single-photon emission in the near-infrared (900-1500nm) band; The preparation of photon source devices still adopts the traditional planar array layout process of vertical cavity surface emitting lasers, and it is very blind to find and position single quantum dots

At the same time, patterned substrates are formed by photolithography or oxidation, and quantum dots are epitaxyed on the substrate. Although the growth of quantum dots can be achieved, it will introduce surface states and reduce the luminous performance of quantum dots, which is usually not used.

Confocal photofluorescence microscopy can locate the single quantum dot micro-domain in the sample through discrete spectral lines; however, the microspectroscopy test requires the sample to be placed in a liquid nitrogen Dewar, and the positioning information is lost after the sample is taken out of the Dewar

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