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Surface plasma resonance sensor based on quantum weak measurement and method for measuring refractive index of metal surface medium

A surface plasmon, weak measurement technology, applied in the technical field of quantum optics technology, can solve the problems such as the difficulty of further improving the sensitivity, the low sample to be tested, and the difficult space for improvement, etc.

Active Publication Date: 2018-04-20
SICHUAN UNIV
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Problems solved by technology

[0003] However, with the advancement of science and technology, the concentration of the sample to be tested is getting lower and lower, and it is even hoped to reach the level of a few or a single molecule. The change in the refractive index of the sample caused by a small concentration change is weaker, which requires a larger sensitivity of the SPR sensor. promotion
The sensitivity of existing SPR sensors (based on amplitude, spectrum, and light intensity) is generally 1×10 -4 RIU~1×10 -6 Between the RIU (Refractive Index Unit), it is equivalent to the inherent noise level of the light source and the instrument, and it is difficult to have room for improvement
The SPR sensor based on phase modulation uses the sensitivity of the phase difference reflected by the TM and TE waves at the interface of the metal medium to the refractive index, and measures the phase difference through light interference, and the sensitivity can reach 2×10 -7 RIU (Wu, Chien-Ming, et al. High-sensitivity sensor based on surface plasmon resonance and heterodyne interferometry. Sensors and Actuators B: Chemical 92.1 (2003): 133-136), but the interference detection optical path adopted is complicated, and shockproof, isolation Vibration to avoid the interference of environmental noise, so it is difficult to be widely used, and the sensitivity is difficult to further improve
[0004] In summary, the sensitivity of SPR sensors based on the macroscopic optical properties of materials has been difficult to improve. In order to further improve the sensitivity of SPR sensors, it is necessary to break the understanding of traditional optical phenomena and explore the optical intrinsic characteristics that are not sensitive to environmental noise and technical noise. , and based on this, a new type of high-sensitivity SPR sensor was developed to achieve accurate measurement of weak changes in the refractive index

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  • Surface plasma resonance sensor based on quantum weak measurement and method for measuring refractive index of metal surface medium
  • Surface plasma resonance sensor based on quantum weak measurement and method for measuring refractive index of metal surface medium
  • Surface plasma resonance sensor based on quantum weak measurement and method for measuring refractive index of metal surface medium

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Embodiment 1

[0070] The surface plasmon sensor based on quantum weak measurement provided by this embodiment has a structure such as figure 1 As shown, the surface plasmon sensor includes a light emitting device, a polarization state generator 3 , a prism 4 coated with a metal film 5 , a sample coupler 6 containing a sample 7 , a polarization state selector and a photodetector 10 . The light emitting device is composed of a light source generator 1 and an energy regulator 2, wherein the light source generator 1 is a collimated laser, and the energy regulator 12 is a half-wave plate. The first polarizer 3 is a Glan laser polarizing prism (BK7). Prism 4 is a right-angled triangular prism. The metal film 5 is a gold film, and one side of the metal film 5 is in contact with the sample 7 . The polarization state selector is composed of a phase compensation system 8 and a polarizer 9, the phase compensation system 8 is located in front of the polarizer 9, the phase compensation system 8 is a p...

Embodiment 2

[0073] This embodiment is based on the quantum weak measurement technology, and adopts the surface plasmon sensor based on the quantum weak measurement provided in Example 1 to measure the refractive index of the NaCl solution sample. The steps are as follows:

[0074] (S1) Prepare 10 parts of NaCl solutions with a known concentration of 0-0.23% (mass percentage); the solution with a concentration of 0 is deionized water, and it is used as a standard solution.

[0075] (S2) Put deionized water into the sample coupler; turn on the light source generator 1, and the laser light emitted by it enters the prism at an incident angle θ=73.0° close to the resonance angle through the energy regulator 2 and the polarization state preparation device 3 -gold film-sample interface to be tested, the reflected light passes through the phase compensation system 8 (phase compensation phi=-1.275rad) and the polarizer 9, and is received by the photodetector 10; Form angle α=0.084rad; Adjust the p...

Embodiment 3

[0096] This embodiment is based on the quantum weak measurement technology, and adopts the surface plasmon sensor based on the quantum weak measurement provided in Example 1 to measure the refractive index of the NaCl solution sample. The steps are as follows:

[0097] (S1) Prepare 10 parts of NaCl solutions with a known concentration of 0-0.23% (mass percentage); the solution with a concentration of 0 is deionized water, and it is used as a standard solution.

[0098] (S2) Put deionized water into the sample coupler; turn on the light source generator 1, and the laser light emitted by it enters the prism at an incident angle θ=73.8° close to the resonance angle through the energy regulator 2 and the polarization state preparation device 3 -gold film-sample interface to be measured, the reflected light passes through the phase compensation system 8 (phase compensation φ=-1.327rad) and the polarizer 9, and is received by the photodetector 10; Form angle α=0.084rad; Adjust the p...

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Abstract

The invention discloses a surface plasma resonance sensor based on quantum weak measurement and a method for measuring refractive index of a metal surface medium. By arranging an appropriate polarization preparation device and a polarization selector, light beam polarization reflected by prism-metallic film-sample interface and the polarization set by the polarization selector are nearly orthogonal, and light intensity obtained by quantum weak measurement amplification effect is used to obtain the refractive index of a sample. The surface plasma resonance sensor is based on a quantum weak measurement technology, has strong inhibition effect for ambient noise and technique noise, and can realize high precision measurement on change of the refractive index of the sample under a natural state, is hopeful for real-time detection and analysis of molecule interacting on ultra-Low concentration and even few molecule layers, and has important application values on multiple technical fields such as biomedicine, life sciences, analytical chemistry, physical sciences, and materials science.

Description

technical field [0001] The invention relates to the technical field of quantum optics, and relates to a method for measuring the refractive index of a metal surface medium of a surface plasmon resonance sensor based on quantum weak measurement. The weak value amplification characteristic of quantum weak measurement is used to further increase the sensitivity of the refractive index sensor compared to the existing one. Some SPR sensors are improved by at least two orders of magnitude, and can be applied to the high-sensitivity detection of real-time, label-free weak molecular interaction processes in the fields of biology, chemistry, and food safety. Background technique [0002] Surface Plasmon Resonance (SPR) is an optical resonance phenomenon that occurs on the surface of a metal / dielectric in the nanoscale range. It is extremely sensitive to changes in the cut-off refractive index of the metal film surface, so it is used to develop various highly sensitive refractive indic...

Claims

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Application Information

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IPC IPC(8): G01N21/21
CPCG01N21/21
Inventor 张志友邱晓东罗兰谢林果李兆雪刘雄
Owner SICHUAN UNIV
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