Method for improving collection efficiency of diamond NV color center fluorescence

A collection efficiency, diamond technology, applied in the direction of fluorescence/phosphorescence, material excitation analysis, etc., can solve the problems of complex experimental operation, unfavorable promotion, large size, etc., and achieve the effect of simple preparation process, small mode volume, and compact structure

Active Publication Date: 2019-06-14
ZHONGBEI UNIV
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Problems solved by technology

[0003] Due to the small coupling strength between the NV color center and the electromagnetic field, the fluorescence collection efficiency of the NV color center has always been low. Strengthening or processing diamonds to produce some special structures and other methods, the experimental operations required for the realization of these methods are very complicated, the experimental requirements

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

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Embodiment Construction

[0023] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0024] The method for improving the fluorescence collection efficiency of the diamond NV color center of the present invention is to utilize the nano-diamond to couple with the optical microsphere cavity, utilize the 532nm laser 1 and the microwave source 8 to excite the diamond, and generate the fluorescence in the cavity After enhancement, it is directly collected and transmitted through the optical fiber 5 connected to the spherical cavity 4, and then received by the photodetector 6 and displayed on the oscilloscope 7 to complete the conversion and reading of the photoelectric signal and achieve high fluorescence collection efficiency. The specific implementation method is as follows (such as Figure 4 shown):

[0025] (1) Nano-diamonds with a particle size of 0-50nm are irradiated with 10MeV electron beams, then annealed in vacuum at 800°...

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Abstract

The invention discloses a method for improving collection efficiency of diamond NV color center fluorescence. The method comprises the following steps of forming an optical resonator by coupling a nano-diamond and a microsphere cavity based on the Purcell effect, integrating a microwave antenna thereon to prepare a microsphere cavity (200-500 microns) containing the nano-diamond, exciting the diamond NV color center to generate fluorescence by 532nm laser, and enhancing and collecting the fluorescence using a whispering wall mode such that the fluorescence generated by the diamond NV color center can be continuously circulated in the microsphere cavity, thereby establishing a strong light field and directly achieving the collection of fluorescence using the fiber connected to the sphere cavity. The method combines nano-diamond with optical microcavity with low requirements on preparation process, has the characteristics such as low cost, small mode volume and high energy density, realizes excitation and efficient collection of diamond NV color center fluorescence, and is expected to realize integrated application of NV color center based high sensitivity quantum sensors.

Description

technical field [0001] The invention relates to the field of fluorescence detection of diamond NV color centers, specifically a method for improving the fluorescence collection efficiency of diamond NV color centers, which is expected to be applied to high-sensitivity quantum sensors based on NV color centers. Background technique [0002] Various lattice defects are ubiquitous in diamond crystals, among which the nitrogen vacancy (NV) color center defect caused by impurity nitrogen has stable optical properties, electron spin properties and ideal solid-state qubit properties at room temperature. It is widely used in quantum storage, quantum information processing, bioluminescent labeling, and super-resolution imaging. Diamond NV color centers have a stable energy level structure and superior luminescence characteristics, can be manipulated by laser and microwave, and can realize high-sensitivity physical quantity detection. Most of the research and application of diamond N...

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Application Information

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IPC IPC(8): G01N21/64
Inventor 刘俊郭浩唐军李中豪赵锐杜芳芳邓胜礼陈宇雷刘郁松
Owner ZHONGBEI UNIV
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