Phase type surface plasma resonance sensor
A surface plasmon and beam splitter technology, applied in the field of photoelectric sensing, can solve the problems of harsh experimental environment and poor sensing stability, and achieve the effect of strong repeatability, high accuracy and good stability
Inactive Publication Date: 2012-06-27
ZHEJIANG UNIV
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[0004] The purpose of the present invention is to propose a phase-type surface plasmon resonance sensor for the shortcomings of the phase-type SPR sensor in the prior art, which have poor sensing stability and strict requirements on the experimental environment.
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[0014] The present invention will be further described below in conjunction with accompanying drawing.
[0015] Such as figure 1 As shown, a phase type surface plasmon resonance sensor includes a laser 1, a polarizer 2, a first beam splitter 3-1, a second beam splitter 3-2, a first analyzer 4-1, a second analyzer A polarizer 4-2, a first detector 5-1, a second detector 5-2, a surface plasmon resonance prism 6, a sample cell 7 and a metal modulator.
[0016] The light emitted by the laser 1 is split in the first beam splitter 3-1 after passing through the polarizer 2, and the transmitted light is incident on the metal modulator, and then reflected back to the first beam splitter 3-1 by the metal modulator , and reflected in the first beam splitter 3-1, the reflected light is split after passing through the second beam splitter 3-2, and the transmitted light reaches the first detector after passing through the first analyzer 4-1 5-1; the reflected light reaches the second dete...
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Abstract
The invention relates to a phase type surface plasma resonance sensor. The traditional phase type surface plasma resonance sensor adopts a piezoelectric ceramic displacement platform to adjust phase, is expensive in price and poor in repeatability of phase modulation so as to cause limited sensing accuracy. The phase type surface plasma resonance sensor comprises a laser, a polarizer, a first beam splitter, a second beam splitter, a first polarization analyzer, a second polarization analyzer, a first detector, a second detector, a surface plasma resonance prism, a sample pool and a metal modulator, wherein a first metal reflecting piece and a second metal reflecting piece in the metal modulator are orthogonally arranged on a fixed frame, which is connected with a rotary platform; and the plane in which a high reflecting mirror is located is vertical to a light beam entering the metal modulator. The light beam entering the metal modulator reaches the high reflecting mirror after being reflected by the first metal reflecting piece and the second metal reflecting piece. The light reflected by the high reflecting mirror returns in the same way after passing through the first metal reflecting piece and the second metal reflecting piece. By utilizing the phase type surface plasma resonance sensor, the refractive index of a sample can be detected accurately at high precision.
Description
technical field [0001] The invention belongs to the technical field of photoelectric sensing and relates to a phase type surface plasmon resonance sensor. Background technique [0002] Photonics is an ancient and young subject. Since the invention of laser, methods based on optical detection have been gradually proposed. The surface plasmon resonance sensor (surface plasmon resonance sensor, hereinafter referred to as SPR sensor) is a new type of sensor that uses laser to excite the resonance of metal surface plasmons to achieve ultra-high-precision detection of samples. [0003] The traditional phase SPR sensor adopts Mach-Zehnder (Mach-Zehnder) interferometer, and uses a piezoelectric ceramic plate to change the optical path of one of its interference arms to realize the phase modulation of the incident excitation light. This method has very high requirements on the stability of the experimental platform, air disturbance in the experimental environment, and collimation of...
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IPC IPC(8): G01N21/41
Inventor 叶高翱罗辰杰钱骏何赛灵
Owner ZHEJIANG UNIV