An integrated diamond nv fluorescence efficient excitation and collection system

Abstract

An integrated diamond NV high efficient fluorescence excitation and collection system is composed of a 523 nm laser trapping ball, a reflective mirror, a filter, and a photoelectric converter. A laserdiode is fixed on the bottom of the 523 nm laser trapping ball; laser generated by the laser diode is converted into parallel light by two convex lenses, then parallel light is converged again; thenlaser is focused on a diamond after laser goes through a polarizing film; laser with a wavelength of 532 nm is reflected by the diamond, when the laser is irradiated on the external edge of a trappingball, due to the action of a coated film, the laser is totally emitted and radiated on a diamond on the ball center again, the diamond is efficiently excited for many times; at the same time, fluorescence (637 nm) generated by excitation of diamond NV is irradiated on the reflective mirror through the coated film on the external edge of the trapping ball, is completely reflected, and is collectedby the photoelectric converter after going through the filter, the data is uploaded to a data collection card and then delivered to a computer, a novel diamond NV fluorescence excitation and collection scheme is provided innovatively; the fluorescence excitation and collection efficiency is improved, and a light trapping technology of diamond high efficient excitation is realized.

Description

technical field [0001] The invention belongs to the field of quantum and micro-assembly, and relates to a diamond NV fluorescence excitation and collection system, more specifically an integrated diamond NV fluorescence excitation and collection system with high efficiency. 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 (spin polarization). The g...

AI Technical Summary

Problems solved by technology

This method is inefficient. Although an objective lens with a large numerical aperture is used, since the refractive index of the diamond itself is 2.4, the exit angle of the fluorescence can be calculated to be about 24.6 degrees. Then the fluorescence photon in the confocal system can be obtained. The collection efficiency is 8%, and the detection efficiency is less than 2%. When the signal is weak, the excited fluorescence signal is very weak, and the collection efficiency of the objective lens is limited. At the same time, photons are lost on the lens during the propagation process. It is not enough to generate the photocurrent signal when using the detector, and the confocal measurement can no longer meet the measurement requirements of the system.

And the future use of NV color center nuclear magnetic resonance as a sensor will inevitably require integration, so integration is the general trend. How to integrate without reducing its excitation and collection efficiency has always been a research hotspot. The size of small optical components for integration is difficult to achieve true integration and inevitably reduces the efficiency of excitation and collection, which requires a new integrated excitation and collection scheme

Images