Method for preparing optical fiber quantum probe with controllable diamond particle doping concentration

Abstract

The invention provides a method for preparing an optical fiber quantum probe with controllable diamond particle doping concentration. The method comprises the following steps of: step 1, mixing a solution with a nano diamond particle aqueous solution containing NV color center; step 2, ultrasonically dissolving the prepared solution doped with the nano diamond particles containing NV color centerby a sol-gel method, sealing and standing, and fully hydrolyzing to form sol-gel; and step 3, uniformly coating the sol-gel prepared in the step 2) on the end surface of the optical fiber, holding theoptical fiber by a stepping motor, contacting the end surface of the optical fiber with the sol-gel for a period of time, pulling at a certain rate to form a hemispherical gel film with a certain thickness and a certain curvature on the end surface, and curing to obtain the prepared optical fiber quantum probe. The method can control the doping concentration of the nano diamond particles containing NV color center, and the mixing is uniform. In addition, the probe has the advantages of convenient manufacturing process and high repeatability, and can realize mass production.

Description

technical field [0001] The invention belongs to the technical field of making optical fiber two-word probes, and relates to a method for preparing optical fiber quantum probes with controllable diamond particle doping concentration, in particular to a method based on sol-gel doping with nitrogen-vacancy color center diamond nanometer Fiber-optic quantum probes for particles. Background technique [0002] At room temperature, the nitrogen-vacancy color center is a carbon atom in diamond replaced by a nitrogen atom, and there is a vacancy nearby, such as figure 1 Shown by the cube on the left. It has unique advantages such as stable optical properties and electron spin properties. This solid-state single-spin system has stable fluorescence emission, ultra-long electron spin coherence time, easy initialization and readout, and can be manipulated. Many advantages such as coherence time show great application prospects in quantum precision measurement. Based on nitrogen-vacanc...

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Problems solved by technology

[0004] In order to overcome the above-mentioned deficiencies in the prior art, the technical problem to be solved in the present invention is that the existing optical fiber and the nano-diamond particle coupling method containing NV color center cannot accurately control the diamond particle concentration, the repeatability is low, and it cannot be produced on a large scale. To solve this problem, a method of preparing optical fiber quantum probes with controllable diamond particle doping concentration is proposed, using the sol-gel method to dope nano-diamonds, and making optical fiber probes on the end face of optical fibers by dipping by pulling method

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