A gold wire-filled photonic crystal fiber surface plasmon resonance biosensor
A photonic crystal fiber, surface plasmon technology, applied in cladding fibers, optical waveguides, instruments, etc., can solve the problems of low sensitivity and cross-sensitivity of fiber sensors, and achieve the effect of high-precision sensing
Inactive Publication Date: 2018-11-27
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology
[0006] The purpose of the present invention is to solve the problems of cross-sensitivity and low sensitivity in existing optical fiber sensors, and provide a dual-core photonic crystal fiber with a relatively simple structure and easy fabrication. The photonic crystal fiber adopts a hexagonal cladding and introduces The core microstructure has been improved, which has higher sensitivity than the existing optical fiber, and the sensitivity of -1700nm / RIU has been realized
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[0023] See attached figure 1 , the photonic crystal fiber surface plasmon resonance biosensor filled with gold wires of the present invention includes a core 3 and a cladding, the cladding has a lower refractive index than the core 3; the core 3 is the background material of the optical fiber, quartz glass 2. The inner air hole of the photonic crystal fiber is filled with the biological liquid 5 to be tested, and gold wires 4 are filled in the two air holes of the cladding. The diameter of the air hole filled with the biological fluid sample to be tested is d c , the gold wire is d m , the diameter of the remaining air holes is d, and the air hole interval is Λ. The imaginary part value of the effective refractive index of the sensor core at different wavelengths is obtained by simulation, and then the transmission loss is calculated, and the wavelength of the surface plasmon resonance peak and the sensitivity of the sensor are obtained through the loss spectrum. The wavele...
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Abstract
The invention discloses a photonic crystal fiber and surface plasma resonance biosensor filled with gold threads, and belongs to the technical field of fiber sensing. The biosensor includes a fiber core and a cladding. The cladding has a refractive index that is lower than that of the fiber core. At places of air holes in the inner layer of the photonic crystal fiber, a to-be-tested bio-liquid sample is filled, and two air holes of the cladding are filled with the gold threads. An imagery value of fiber core effective refractive index of the biosensor under different wavelengths are obtained, and further transmission loss is calculated, and the wavelength where a surface plasma resonance peak is at and sensitivity of the sensor are obtained through a loss spectra. Different refractive indexes of the to-be-tested bio-liquid samples cause different transmission of wavelengths where the loss spectra resonance peaks. According to the invention, the biosensor combines surface plasma resonance technology and photonic crystal fiber, obtains a sensitivity as high as 1700nm / RIU. The refractive index of the to-be-tested liquid sample has a wide range between 1.37-1.44%. The biosensor has simple structure, is easy to operate, and has wide application potential in the field of sensing.
Description
technical field [0001] The invention belongs to the technical field of optical fiber sensing, in particular to a photonic crystal optical fiber surface plasmon resonance biosensor filled with gold wires. Background technique [0002] Photonic crystal fibers are also called microstructured fibers and holey fibers. According to different light guiding mechanisms, photonic crystal fibers can be divided into refractive index guided fibers and photonic bandgap fibers. [0003] Compared with traditional optical fibers, photonic crystal fibers have the following advantages: infinite single-mode transmission characteristics, high birefringence characteristics, high nonlinearity, low effective mode field area, easy multi-core transmission and flexible design. Since the structure of the photonic crystal fiber has a great influence on the characteristic research, the air holes in the cladding and the fiber core can be designed according to the needs to meet the application requirements...
Claims
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IPC IPC(8): G02B6/02
CPCG02B6/02314G02B6/02385
Inventor 白育堃马颖
Owner TIANJIN UNIVERSITY OF TECHNOLOGY