Efficient diamond NV (nitrogen-vacancy) color center fluorescence collection device

Abstract

The invention belongs to the field of optical experiment platform instruments and particularly relates to an efficient diamond NV (nitrogen-vacancy) color center fluorescence collection device. The efficient diamond NV color center fluorescence collection device mainly comprises an experiment platform, a high integration density exciting and acquiring module and a controller, wherein the high integration density exciting and acquiring module is installed on the experiment platform, laser radiates on a diamond after going into a laser incidence port of a reflection prism through an objective lens, a microwave antenna emits microwave for excitation, the reflection prism constantly reflects, and the fluorescence is finally reflected and radiates on a fluorescence acquiring photodiode through an optical filter, and is finally transmitted to a mainframe to be processed. The transparent antenna is used to integrate a PCB and a flexible aligning clamping method is matched, the diamond is accurately installed and located, the transparent packaging antenna is used to efficiently excite, the internal reflection of the internal pyramid-shape reflection prism is used to basically irradiate the fluorescence on the fluorescence acquiring photodiode to efficiently acquire the fluorescence, and the efficient diamond NV color center fluorescence collection device has the advantages of scientific design, reasonable structure, high locating accuracy and modularization.

Description

technical field [0001] The invention belongs to the field of optical experiment platform instruments, and relates to the realization of high-efficiency NV color center excitation and fluorescence collection, in particular to a high-efficiency diamond NV color center fluorescence collection device. Background technique [0002] Fluorescence is a common light-emitting phenomenon in nature. Usually, after the electrons outside the nucleus are excited to transition from the ground state S0 to the excited state S1, they will quickly land at the lowest vibrational energy level through a non-radiative transition, and then return to the ground state from the lowest vibrational energy level, releasing energy in the form of photon radiation. Emerging light with this property is called fluorescence. [0003] The atomic gyroscope is a new technology developed in recent years. It mainly uses laser pumping to polarize the target electrons to sense the rotation of the external carrier (sp...

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Problems solved by technology

[0006] But when the 532nm laser comes out of the AOM, it is reflected by the dichroic mirror and focused by the objective lens, and irradiates the diamond. In order to collect the fluorescence emitted from the diamond as much as possible, an objective lens with a large numerical aperture is used, but due to the refraction of the diamond itself The ratio is 2.4, after calculation, the emission angle of the fluorescence is about 24.6 degrees, then it can be concluded that the collection efficiency of fluorescence photons in the confocal system is 8%, and the detection efficiency is less than 2%. When the signal is very weak ( The laser and microwave power are weak), the excited fluorescence signal is very weak, the collection efficiency of the objective lens is limited, and the loss of photons on the lens during the propagation process is not enough to generate photocurrent when the fluorescence reaches the photodetector. Confocal measurement Can not meet the measurement requirements of the system

[0007] At present, the existing diamond NV color center fluorescence collector collects one surface or five surfaces, but there are still some fluorescences that cannot be collected, which has a certain impact on the experimental data

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