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D-shaped fiber optic SPR biosensors based on a metal-graphene structure

Chinese Optics Letters 2013年第11期11卷 38-41页

作者：冯德军刘冠秀张茂森贾东方 School of Information Science and Engineering Shandong University College of Precision Instrument and Optoelectronics Engineering Tianjin University

We design a D-shaped fiber optic biosensor based on the surface plasmon resonance （SPR） of a metal- graphene layer and simulate this SPR using the finite element method. Using a metal-graphene layer as the sensing material, surface plasma resonance is simulated as the refractive index of the external environment ranges from 1.33 to 1.36. Simulation results show that a metal-graphene layer attached to the D-shaped optical fiber core can couple with light under a specific polarization state and excite strong plasma os- cillations on the layer surface. Calculated transmission coefficients show that the resonance wavelength obviously moves toward longer wavelengths as the refractive index of the test medium increases, and a sen- sitivity of 5400 nm/RIU is obtained. Because of its large surface volume ratio and good biocompatibility, graphene map be utilized in many applications in the field of biosensing.

关键词： Biocompatibility electron resonance Graphene Optical fibers Plasma oscillations Refractive index Surface plasmon resonance

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Fano-Like resonance in Cylinders Including Nonlocal Effects

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Chinese Physics Letters 2014年第8期31卷 143-146页

作者：李粮生殷红成 ScienceandTechnologyonElectromagneticScatteringLaboratory Beijing100854

We investigate the optical response of a metallic wire calculated from the classical electromagnetic theory. The Drude （local） approach is compared with the semi-classical hydrodynamical theory calculations that reveal the Fano-like resonances of subsidiary peaks originated from the nonlocality. The bulk plasma resonances containing the nonlocal effects could be depressed by increasing the dissipation, while the blue shift of the surface localized plasma resonances could be enhanced by increasing the Fermi velocity.

关键词： electron resonance

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Influence of the net gain on characteristic of stochastic resonance in a single-mode laser system

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Chinese Optics Letters 2004年第6期2卷 331-333页

作者：程庆华曹力徐大海吴大进 School of Physics Science and Technology Yangtze University Jinzhou 434100 State Key Laboratory of Laser Technology Huazhong University of Science and Technology Wuhan 430074 State Key Laboratory of Laser Technology Huazhong University of Science and Technology Wuhan 430074 Department of Physics Huazhong University of Science and Technology Wuhan 430074 School of Physics Science and Technology Yangtze University Jinzhou 434100 State Key Laboratory of Laser Technology Huazhong University of Science and Technology Wuhan 430074 Department of Physics Huazhong University of Science and Technology Wuhan 430074he phenomenon of stochastic resonance (SR) is found in a single-mode laser system driven by the colored pump noise with signal modulation and the quantum noise with cross-correlation between the real and imaginary parts. When the net gain a0 changes it is found that 1) the shape of the curve of the signal-to-noise ratio (SNR) versus the pump noise self-correlation time τexhibits a changing process of multiform SR from single-peak SR to simultaneous existence of resonances and suppressions 2) the curve of SNR. versus signal frequency Ωexperiences a complicated changing process from the monotonous descending to the simultaneous appearances of a maximum and a minimum and finally to monotonous descending 3) the curve of SNR versus cross-correlation coefficient between the real and imaginary parts of the quantum noise λq appears an acute single-peak SR. Therefore the net gain ao greatly influences the characteristic of SR of laser system.

The phenomenon of stochastic resonance (SR) is found in a single-mode laser system driven by the colored pump noise with signal modulation and the quantum noise with cross-correlation between the real and imaginary parts. When the net gain a0 changes, it is found that, 1) the shape of the curve of the signal-to-noise ratio (SNR) versus the pump noise self-correlation time τ exhibits a changing process of multiform SR, from single-peak SR, to simultaneous existence of resonances and suppressions; 2) the curve of SNR. versus signal frequency Ω experiences a complicated changing process from the monotonous descending to the simultaneous appearances of a maximum and a minimum, and finally to monotonous descending; 3) the curve of SNR versus cross-correlation coefficient between the real and imaginary parts of the quantum noise λq appears an acute single-peak SR. Therefore, the net gain ao greatly influences the characteristic of SR of laser system.

关键词： electron resonance Laser applications Signal processing Signal to noise ratio Single mode fibers

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