Method for improving fluorescence collection efficiency of diamond NV color center

A collection efficiency, diamond technology, applied in the size/direction of the magnetic field, magnetic field measurement using magneto-optical equipment, etc., can solve the problems of low fluorescence collection efficiency of NV color centers and difficulties in improving fluorescence collection efficiency

Active Publication Date: 2021-03-12
THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Aiming at the low fluorescence collection efficiency of existing NV color centers and the difficulty in improving the fluorescence collection efficiency, the present invention provides a method for improving the fluorescence collection efficiency of diamond NV color centers

Method used

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  • Method for improving fluorescence collection efficiency of diamond NV color center

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Embodiment 1

[0023] A method for improving the fluorescence collection efficiency of diamond NV color centers, comprising the following process steps:

[0024] a. Take a cuboid single crystal diamond with a nitrogen doping concentration of 5ppm and a size of 1.5mm×1.5mm×10mm, and polish the six sides of the cuboid diamond so that the roughness of the six sides is 0.2nm, using 10MeV electrons The beam irradiates the polished diamond for 1 hour;

[0025] b, the irradiated diamond at 10 -5 mbar, annealed at 850°C for 5h;

[0026] c. Add the annealed diamond to a strong acid solution consisting of concentrated sulfuric acid and concentrated nitric acid solution with a volume ratio of 1:0.8 and boil it for 30 minutes to remove the oxide layer and impurities on the diamond surface; then take out the diamond and use high refraction High-efficiency UV-curable glue is used to connect Y-shaped optical fibers on the two opposite sides of the rectangular parallelepiped diamond with the smallest area...

Embodiment 2

[0029] A method for improving the fluorescence collection efficiency of diamond NV color centers, comprising the following process steps:

[0030] a. Take a cuboid single crystal diamond with a nitrogen doping concentration of 98ppm and a size of 1.5mm×1.5mm×10mm, and polish the six sides of the cuboid diamond so that the roughness of the six sides is 0.5nm, using 5MeV electrons The beam irradiates the polished diamond for 5 hours;

[0031] b, the irradiated diamond at 5 -5 mbar, annealed at 900°C for 3h;

[0032] c. Add the annealed diamond to a strong acid solution consisting of concentrated sulfuric acid and concentrated nitric acid solution with a volume ratio of 1:1 and boil it for 100 minutes to remove the oxide layer and impurities on the diamond surface; then take out the diamond and use high refraction High-efficiency UV-curable glue is used to connect Y-shaped optical fibers on the two opposite sides of the rectangular parallelepiped diamond with the smallest areas...

Embodiment 3

[0035] A method for improving the fluorescence collection efficiency of diamond NV color centers, comprising the following process steps:

[0036] a. Take a cuboid single crystal diamond with a nitrogen doping concentration of 198ppm and a size of 1.5mm×1.5mm×10mm, and polish the six sides of the cuboid diamond so that the roughness of the six sides is 1nm, using a 2MeV electron beam Irradiate the polished diamond for 10 hours;

[0037] b. Put the irradiated diamond at 1 -5 mbar, annealed at 1000°C for 1h;

[0038]c. Add the annealed diamond to a strong acid solution consisting of concentrated sulfuric acid and concentrated nitric acid solution with a volume ratio of 1:1.2 and boil it for 180 minutes to remove the oxide layer and impurities on the diamond surface; then take out the diamond and use high refraction High-efficiency UV-curable glue is used to connect Y-shaped optical fibers on the two opposite sides of the rectangular parallelepiped diamond with the smallest are...

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Abstract

The invention relates to the technical field of diamond color center preparation, and particularly discloses a method for improving the fluorescence collection efficiency of a diamond NV color center.The method for improving the fluorescence collection efficiency of the diamond NV color center comprises the following process steps: a, taking cuboid diamond, and irradiating the cuboid diamond by using 2-10 MeV electron beams; b, annealing the irradiated diamond at the temperature of 1-5-10-5 mbar and the temperature of 850-1000 DEG C; and c, removing an oxide layer and impurities on the surface of the annealed diamond, respectively connecting optical fibers to two opposite side surfaces of the diamond, and plating total reflection plating layers on the rest four surfaces of the diamond. According to the method for improving the fluorescence collection efficiency of the diamond NV color center, the single crystal diamond color center cavity can achieve the effect of high-efficiency fluorescence reflection and collection similar to an optical fiber cavity, and the fluorescence collection efficiency of the diamond NV color center is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of preparation of diamond color centers, in particular to a method for improving the fluorescence collection efficiency of diamond NV color centers. Background technique [0002] The diamond NV color center is a solid-state single-spin quantum system with various excellent properties. With the help of the NV color center, the detection of a weak magnetic field can be realized. At room temperature and pressure, the spin state of the NV electron can be read out by laser initialization, and The measurement of the external magnetic field is widely used in the fields of quantum storage, quantum information processing, bioluminescent labeling, and super-resolution imaging. The traditional method of exciting diamond NV color centers is to use a 532nm laser to vertically incident the laser from the large diamond surface into the inside of the diamond. This method will result in a relatively short laser path, general...

Claims

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Application Information

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IPC IPC(8): G01R33/032
CPCG01R33/032
Inventor 高学栋冯志红蔚翠何泽召刘庆彬郭建超周闯杰
Owner THE 13TH RES INST OF CHINA ELECTRONICS TECH GRP CORP
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