Near-infrared band double-D type photonic crystal fiber SPR sensor

Abstract

The invention discloses a double-D type structure photonic crystal fiber sensor based on surface plasma resonance. The photonic crystal fiber comprises a photonic crystal fiber, air holes and a nanogold film. Air holes are formed in the inner edge of the silicon dioxide. The two photonic crystal fibers are symmetrically distributed in parallel, the photonic crystal fibers are both side-thrown intoa D shape, the side-thrown surface is coated with a nanogold film, an air hole in the middle of the side-thrown surface is semicircular, and the air hole and the neighborhood of the air hole form a photonic crystal fiber core, namely, an area defined by the air hole forms the photonic crystal fiber core. According to the sensor, the two parallel D-type optical fibers are used for achieving coupling, the sensitivity of the sensor can be effectively improved, and the sensor is a practical refractive index sensor.

Description

[0001] (1) Technical field [0002] The invention relates to a near-infrared band double-D photonic crystal fiber surface plasmon resonance sensor [0003] (2) Background technology [0004] In recent years, photonic crystal fiber surface plasmon resonance (PCF-SPR) sensors have shown great application potential in the fields of life sciences, drug screening, molecular recognition, and immunoassays due to their excellent sensing performance. extensive attention. [0005] Photonic Crystal Fibers (PCFs), also known as microstructured fibers, was first proposed in 1992 by STJ.Rusell et al. A defect structure that breaks the periodicity of the cladding is introduced, this defect can be a large air hole or a solid quartz. The first PCF sample was developed by Russell et al. in 1996 at the University of Bath, UK. [0006] Surface plasmons (Surface Plasmons, SPs) refer to the evanescent wave of electrons propagating along the metal surface generated by the interaction between freel...

AI Technical Summary

Problems solved by technology

However, little progress has been made in the fabrication of dual-parallel D-shaped PCF-SPR sensors

[0010] In the previous studies on PCF-SPR, most of them only studied the coupling between the core guided mode and the surface plasmon mode, and rarely involved the coupling of modes other than these two modes, such as the mode penetrating into the solution to be measured and the surface plasmon mode. Coupling between plasma modes, guided mode coupling (intermode interference) between cores in a multi-core fiber, etc.

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