Wide-range adjustable optical fiber filter based on SPR (Surface Plasmon Resonance) principle
A fiber optic filter, a wide-ranging technology, applied in the direction of instruments, light guides, optics, etc., can solve the problems of complex preparation, narrow wavelength sensing effect, and limited application range, and achieve simple preparation process, good adjustability, and wide application range wide effect
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Embodiment 1
[0061] Embodiment 1 is broad spectrum filtering 1 .
[0062] Throw the fiber side as figure 2 The D-type optical fiber with the remaining cladding of 0.5 μm is coated with 40 nm gold film and single-layer graphene on fiber 2, encapsulated with a refractive index matching liquid with a refractive index of 1.33, and coated with 40 nm gold film on fiber 3 And single-layer graphene, and encapsulated with a refractive index matching liquid with a refractive index of 1.36, turn on the broad-spectrum light source and pass through the isolator, forming an evanescent field in the side throwing area into the metal film, exciting the surface plasmon resonance, and the transmitted light is The spectrum absorber receives and obtains the corresponding peak wavelength. according to Figure 4 It can be seen that there are two transmission peaks, the peaks appear at 665nm and 710nm, and the transmittance is between 0.1 and 0.13. Due to the cascade structure of fibers 2 and 3, after subseque...
Embodiment 2
[0063] Embodiment 2 is broad spectrum filtering 2 .
[0064] use as image 3 Circular fiber, coated with 50nm gold film and 20nm TiO on fiber 2 2 , encapsulated with a refractive index matching solution with a refractive index of 1.35, and coated with 50nm gold film and 20nm TiO on fiber 3 2 , and encapsulated with a refractive index matching liquid with a refractive index of 1.36, turn on the broad-spectrum light source and pass through the isolator, form an evanescent field in the coating area and enter the metal film, excite the surface plasmon resonance, and the transmitted light is received by the spectral absorber. the corresponding peak wavelength. according to Figure 5 It can be seen that there are two transmission peaks, the peaks appear at 1000nm and 1060nm, and the transmittance is between 0.08 and 0.1. Due to the cascade structure of the optical fiber, after subsequent processing, the broad spectrum filtering range is 120nm, and the fiber loss is 780dB / cm, ca...
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