Quantum-enhancement-based optical fiber surface plasmon resonance refractive index sensor
A technology of surface plasmon and refractive index, which is applied to the measurement of phase influence characteristics, etc., can solve the problem that the measurement accuracy cannot be further improved
Pending Publication Date: 2019-11-26
CHINA JILIANG UNIV
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[0006] In order to overcome the problem that the ordinary refractive index sensor is limited by the wavelength sensitivity and resolution, so that the measurement accuracy cannot be further improved, the present invention proposes a sensor with extremely high sensitivity, simple structure and high practical value that breaks through the limit of quantum noise. Optical fiber surface plasmon resonance refractive index sensor based on quantum enhancement that breaks through the limit of quantum noise
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[0039] The present invention will be further described below in conjunction with the accompanying drawings.
[0040] Such as figure 1 As shown, the optical fiber surface plasmon resonance refractive index sensor based on quantum enhancement includes a laser 1, a first coupler 2, a first filter 3, an erbium-doped fiber amplifier 4, a first fiber polarization controller 5, a first fiber polarization Beam splitter 6, second filter 7, second fiber polarization controller 8, second fiber polarization beam splitter 9, second fiber polarization controller 10, second coupler 11, dispersion shifted fiber 12, coarse wavelength division Multiplexer 13, fiber optic SPR sensor 14, balance detector 15, spectrum analyzer 16.
[0041] One port and one end 201 of the first coupler 2 in the optical fiber quantum entanglement source module are connected to the laser, and the high split ratio port 202 on one side of the two ports of the first coupler 2 is connected to the input end of the first ...
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The invention discloses a quantum-enhancement-based optical fiber surface plasmon resonance refractive index sensor, which includes a laser, a 2*1 coupler, a filter, an erbium-doped fiber amplifier, afilter, a fiber polarization controller, a fiber polarization beam splitter, a dispersion-shifted fiber, a coarse wavelength division multiplexer, a fiber SPR sensor, a balance detector, and a spectrum analyzer. When the external refractive index changes slightly, the resonance response of a quantum enhanced SPR sensor will produce frequency shift and the light transmission intensity under a given wavelength changes correspondingly; the reflected light intensity change and the refractive index changing amount are in a linear relationship; the obtained transmitted light intensity of the fiberSPR sensor is compared with that of the reference light; and the refractive index changing amount is obtained by the measuring the intensity change. According to the invention, the sensor has advantages of breaking the quantum noise limit by the sensitivity and realizing high safety and reliability.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to an optical fiber surface plasmon resonance refractive index sensor based on quantum enhancement. Background technique [0002] Surface plasmon resonance (SPR) is generated by the interaction between incident light waves and free electrons on the surface of metal conductors. When light is incident from an optically denser medium to an optically rarer medium and the incident angle is greater than the reflection angle, there will be total reflection. If there is a thin metal film of several tens of nanometers between the optically dense and optically sparse media, the evanescent wave generated by total reflection will enter the metal film and interact with the free electrons in the film to excite electrons along the metal film. Surface plasmon waves propagating on the surface. Due to the existence of the surface evanescent wave field and the complex refractive index ...
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Login to View More IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 赵春柳王武楠石岩王海龙赵天琦金尚忠
Owner CHINA JILIANG UNIV