CN-122016038-A - Terahertz signal detection fluorescence system based on diamond color center

CN122016038ACN 122016038 ACN122016038 ACN 122016038ACN-122016038-A

Abstract

The invention relates to the technical field of terahertz signal detection, and provides a terahertz signal detection fluorescent system based on a diamond color center, which comprises an objective table, a detection module and a detection module, wherein the objective table is provided with diamond; the device comprises a terahertz signal generation light path, a phonon signal detection light path and a signal processing module, wherein the terahertz signal generation light path is used for generating a terahertz signal with adjustable frequency and acting on a Pb color center of diamond, the phonon signal detection light path comprises a fluorescence detection module, a demodulation module and a signal processing module, the fluorescence detection module is used for acting generated laser on the Pb color center of diamond to generate a mixed fluorescence signal, the demodulation module is used for separating the mixed fluorescence signal to obtain two light signals, determining an intensity difference according to the two light signals and outputting a corresponding electric signal based on the intensity difference, and the signal processing module is used for determining the numerical value of the terahertz signal based on the electric signal. Therefore, by utilizing quantum characteristics of Pb color center of the diamond and the co-design of the double light paths, high sensitivity, direction selective detection and real-time monitoring of terahertz signals can be realized.

Inventors

LIU XIAOYU
CHANG CHAO
LUO ZHIFU
Wang Ride

Assignees

中国人民解放军军事科学院国防科技创新研究院

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (10)

1. A terahertz signal detection fluorescence system based on a diamond color center, comprising: An objective table provided with diamond; the terahertz signal generation light path is used for generating a terahertz signal with adjustable frequency and acting on the Pb color center of the diamond; The phonon signal detection light path comprises a fluorescence detection module, a demodulation module and a signal processing module, wherein the fluorescence detection module is used for enabling generated laser to act on a Pb color center of the diamond to generate a mixed fluorescence signal, the demodulation module is used for separating the mixed fluorescence signal to obtain two light signals, determining an intensity difference according to the two light signals and outputting a corresponding electric signal based on the intensity difference, and the signal processing module is used for determining the numerical value of a terahertz signal based on the electric signal.
2. The diamond color center based terahertz signal detection fluorescence system of claim 1, wherein the two light signals include two first light signals and two second light signals, the determining an intensity difference from the two light signals includes: And determining the intensity difference according to the two first light signals and the two second light signals, wherein the two first light signals correspond to the Pb color center of the diamond acted by the terahertz signals, and the two second light signals correspond to the Pb color center of the diamond not acted by the terahertz signals.
3. The terahertz signal detection fluorescence system based on diamond color center according to claim 1, wherein the fluorescence detection module includes a first laser, a beam splitter, an objective lens, a first lens, a pinhole spatial filter, a band-pass filter, and a glabrous taylor prism; The objective lens, the beam splitter, the pinhole space filter, the first lens, the band-pass filter and the gram Taylor prism are sequentially arranged, and laser output by the first laser sequentially passes through the beam splitter and the objective lens and acts on the Pb color center of the diamond.
4. The diamond-center-based terahertz signal detection fluorescence system of claim 3, wherein the terahertz signal generation optical path includes a second laser that outputs a first laser light having a first wavelength that is equal to a second laser light having a second wavelength.
5. The system of claim 1, wherein the demodulation module comprises a wollaston prism, a mirror group and a balance detector, which are sequentially arranged, wherein the wollaston prism is used for separating the mixed fluorescent signals to obtain two light signals, the two light signals enter the balance detector after being reflected by the mirror group, and the balance detector determines an intensity difference according to the two light signals and outputs a corresponding electric signal based on the intensity difference.
6. The terahertz signal detection fluorescence system based on a diamond color center according to claim 5, wherein a spectroscopic angle of the Wollaston prism is 15 ° ± 0.5 °, a path difference of two light signals is 5 μm or less, and/or, The common mode rejection ratio of the balance detector is greater than or equal to 80dB, and the bandwidth is greater than or equal to 1MHz.
7. The diamond color center-based terahertz signal detection fluorescent system according to claim 1, wherein the terahertz signal generating optical path includes a terahertz signal generating main path for generating a terahertz signal with an adjustable frequency and a terahertz signal correction branch for determining a value of the terahertz signal.
8. The diamond color center-based terahertz signal detection fluorescence system of claim 7, wherein the frequency range of the terahertz signal is 0.1-30 thz.
9. The terahertz signal detection fluorescent system based on diamond color center according to claim 1, wherein the diamond is type IIa single crystal diamond, and Pb element is injected into the diamond by ion implantation technique, wherein the injection dose is 1×10 8 ion/cm 2 or more.
10. The terahertz signal detection fluorescent system based on a diamond color center according to claim 9, wherein the diamond is subjected to an annealing operation, wherein the annealing temperature is 1000 ℃ or higher, the annealing time is 1h or higher, and the annealing vacuum is 1 x10 -4 Pa or higher.

Description

Terahertz signal detection fluorescence system based on diamond color center Technical Field The invention relates to the technical field of terahertz signal detection, in particular to a terahertz signal detection fluorescent system based on a diamond color center. Background Under the promotion of vigorous development in the fields of wireless communication, biomedicine and the like, terahertz technology is an attractive technological direction in front of the attention because of the unique advantages of wide frequency spectrum, high transmission rate and the like. In the terahertz detection key link, the conventional detector exposes a plurality of short plates which are difficult to overcome. For example, the sensitivity of the pyroelectric detector is poor, the detector is not good enough to face weak signals, the detection requirements in practical application are difficult to meet, the optical detection system based on the femtosecond laser is high in cost and large in size, the application of the optical detection system in scenes with strict requirements on space and cost is limited, and most of the traditional detectors are lack of direction selectivity and real-time response capability and cannot accurately capture signals in specific directions and timely feed back the signals. Although the nano-scale detection technology has advanced to some extent in recent years, related schemes still have obvious defects, and it is difficult to achieve key indexes such as high sensitivity, compact structure and polarization resolution detection at the same time. Disclosure of Invention The invention provides a terahertz signal detection fluorescent system based on a diamond color center, which is used for solving the problems of low terahertz detection sensitivity, complex system structure, lack of direction selectivity and the like in the prior art. The invention provides a terahertz signal detection fluorescence system based on a diamond color center, which comprises the following components: An objective table provided with diamond; the terahertz signal generation light path is used for generating a terahertz signal with adjustable frequency and acting on the Pb color center of the diamond; The phonon signal detection light path comprises a fluorescence detection module, a demodulation module and a signal processing module, wherein the fluorescence detection module is used for enabling generated laser to act on a Pb color center of the diamond to generate a mixed fluorescence signal, the demodulation module is used for separating the mixed fluorescence signal to obtain two light signals, determining an intensity difference according to the two light signals and outputting a corresponding electric signal based on the intensity difference, and the signal processing module is used for determining the numerical value of a terahertz signal based on the electric signal. According to the terahertz signal detection fluorescence system based on the diamond color center, the two light signals comprise two first light signals and two second light signals, the intensity difference is determined according to the two light signals, and the terahertz signal detection fluorescence system comprises: And determining the intensity difference according to the two first light signals and the two second light signals, wherein the two first light signals correspond to the Pb color center of the diamond acted by the terahertz signals, and the two second light signals correspond to the Pb color center of the diamond not acted by the terahertz signals. According to the terahertz signal detection fluorescence system based on the diamond color center, the fluorescence detection module comprises a first laser, a beam splitter, an objective lens, a first lens, a pinhole space filter, a band-pass filter and a gram Taylor prism; The objective lens, the beam splitter, the pinhole space filter, the first lens, the band-pass filter and the gram Taylor prism are sequentially arranged, and laser output by the first laser sequentially passes through the beam splitter and the objective lens and acts on the Pb color center of the diamond. According to the terahertz signal detection fluorescent system based on the diamond color center, the terahertz signal generation light path comprises a second laser, the first laser outputs first laser with a first wavelength, the second laser outputs second laser with a second wavelength, and the first wavelength is equal to the second wavelength. According to the terahertz signal detection fluorescence system based on the diamond color center, the demodulation module comprises a Wollaston prism, a reflector group and a balance detector which are sequentially arranged, the Wollaston prism is used for separating the mixed fluorescence signals to obtain two light signals, the two light signals enter the balance detector after being reflected by the reflector group, the balance detector determines intensity di