Three-core photonic crystal fiber SPR sensor based on gold film coating
A technology of photonic crystal fiber and sensor, which is applied in the direction of phase influence characteristic measurement, etc., can solve the problems that have not been verified, and achieve the effects of simplifying the production process, improving sensitivity, and reducing the number of pores
Active Publication Date: 2021-08-13
KUNMING UNIV OF SCI & TECH
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Problems solved by technology
However, the sensor adopts a multi-layer thin film structure, and the interaction force between layers and the sputtering difficulty in the manufacturing process have not yet been verified.
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Embodiment 1
[0028] Embodiment 1: as figure 1 As shown, the three-core photonic crystal fiber SPR sensor based on gold film coating includes gold film 1, fiber core 2, small air hole I3, small air hole II4, large air hole 5, cladding 6, and the material of cladding 6 is silicon dioxide. The cross-section of the cladding is circular, and the diameter of the cladding is 8.6 μm. The gold film 1 is arranged on the outside of the cladding 6 with a thickness of 40 nm; there are three types of air holes with different diameters in the cladding 6, a total of 16, in the cladding 6 There is a small air hole II4 in the center, and the diameter of the small air hole II4 is 0.4 μm; there is an inner air hole outside the small air hole II4, and the inner air hole is three small air holes I3 arranged in an equilateral triangle, and the diameter of the small air hole I3 is 0.6 μm. The center distance between the small air hole Ⅰ3 and the small air hole Ⅱ4 is The air holes in the outer layer are composed...
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Abstract
The invention discloses a three-core photonic crystal fiber SPR sensor based on gold film coating. The sensor comprises a gold film, fiber cores, a small air hole I, a small air hole II, a large air hole and a cladding, the gold film is arranged on the outer side of the cladding, the small air hole II is formed in the center of the cladding, and inner-layer air holes are formed in the outer side of the small air hole II. The inner-layer air holes are small air holes I arranged in a regular triangle shape, an outer-layer air holes are formed by arranging the small air holes I and large air holes in a regular hexagon shape, and the large air holes are located between the small air holes I. Meanwhile, three solid fiber cores are formed in the cladding, and the three fiber cores share the small air hole II. The design of the three-core structure improves the detection range of the sensor; by using the gold film, the SPR phenomenon can be better excited, and the sensitivity and the resolution ratio of the sensor can be improved; the sensor is simple in structural design, small in size, wide in detection range, high in corrosion resistance and high in sensitivity and resolution ratio, is a practical sensor, and has commercial popularization potential.
Description
technical field [0001] The invention relates to the technical field of optical fiber SPR sensing, in particular to a gold film-coated three-core photonic crystal optical fiber SPR sensor. Background technique [0002] Surface plasmon resonance (SPR) means that at a certain incident wavelength or incident angle, the frequency of the surface plasmon and the evanescent wave are equal, the incident light is strongly absorbed, and the energy of the reflected light or transmitted light is sharply reduced. The corresponding resonant absorption peaks are generated in the detection spectrum. Changes in the refractive index of the medium around the metal surface will change the position of the resonant absorption peak. Therefore, SPR technology can be applied to the fields of drug screening, clinical diagnosis and environmental detection. [0003] The sensors designed and manufactured using SPR technology have the advantages of high sensitivity, real-time detection and strong anti-in...
Claims
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IPC IPC(8): G01N21/41
CPCG01N21/41
Inventor 秦亚飞杨友朋王冬卢鑫雨曾雨
Owner KUNMING UNIV OF SCI & TECH