Nano-scale resolution integrated optical quantum thermometer

Abstract

The invention discloses a nano-scale resolution integrated optical quantum thermometer. The optical quantum thermometer comprises a spectrophotometer and a quantum temperature sensing chamber. Under the excitation of laser with specific wavelength, a CR (Cross Relaxation) position and corresponding magnetic field intensity according to the physical phenomenon that the PL (Photoluminescence) intensity of a SiC crystal changes remarkably when the SiC crystal causes the CR phenomenon. When the temperature changes 1 mK, the magnetic field frequency shift of a number nT can change, so that the CR positions and the magnetic field intensity respectively corresponding to different temperatures are determined; a calibration curve of the CR positions and the temperatures in the magnetic field is constructed; nano-scale spatial resolution is realized through a macro / micro driving positioning platform; the CR position of the SiC crystal is obtained by displaying the PL intensity change by an uppercomputer, and the temperature distribution graph of a sample material to be detected is obtained according to the calibration curve. The nano-scale resolution integrated optical quantum thermometer is based on the spinning and the CR phenomenon of the SiC crystal; the spatial resolution reaches nano-scale; the temperature measurement precision of 10 mK / Hz1 / 2 is realized; the integrated optical quantum thermometer is constructed; engineering application is facilitated.

Description

technical field [0001] The invention relates to the technical field of quantum optics and instruments, in particular to an integrated optical quantum thermometer with nanoscale resolution. Background technique [0002] Measuring weak temperature fields with high spatial resolution at the micro- and nano-scale is currently a major challenge in fields ranging from fundamental physics to material science to data storage and even biomedical science. Currently studied optical quantum thermometers with micron-scale resolution are based on NV color centers with fundamental triplet spin states, and the spin levels are selectively filled in excited states, which can be developed for temperature measurement. For silicon carbide (SiC), it was found that the S=3 / 2 spin level can be selectively filled under light radiation in the near-infrared range, based on which a method using optically detected magnetic resonance (ODMR) was proposed to measure magnetic field and temperature field. ...

AI Technical Summary

Problems solved by technology

This optical quantum thermometer is made by using the physical phenomenon of the sharp change of near-infrared photoluminescence intensity and the cross relaxation in the external magnetic field when the SiC crystal is at the spin level S=3 / 2. It is characterized in that the SiC crystal recrosses Strong dependence on temperature when the relaxation phenomenon occurs, achieving 50mK / Hz 1 / 2 The temperature measurement accuracy is high, and the spatial resolution reaches 300nm, but the ODMR linewidth of this method is relatively large, reaching 2mT, and because the lifetime of the excited state of the crystal is fixed, the linewidth cannot be reduced

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