U-shaped optical fiber local surface plasmon resonance (LSPR) sensor based on silver triangular plate

Abstract

The invention discloses a U-shaped optical fiber local surface plasmon resonance (LSPR) sensor based on a silver triangular plate. In structure, the sensor specifically comprises a U-shaped optical fiber structure, wherein the U-shaped optical fiber structure comprises two multi-mode optical fibers and one U-shaped multi-mode optical fiber core, two ends of the multi-mode optical fiber core are respectively connected with the multi-mode optical fibers, the multi-mode optical fiber core comprises a U-shaped bending part, the surface of the U-shaped bending part is plated with silver triangularplate nanoparticles, the surface of the silver triangular plate nanoparticle is plated with graphene oxide. The LSPR sensor adopts the U-shaped optical fiber structure, thereby increasing sensing areaand reducing volume of a sensor probe; and the optical fiber surface of the U-shaped bending part is plated with a layer of silver triangular plate nanoparticles which have sharp tips, so that the tip discharging characteristic helps improve field intensity of a local electric field effectively.

Description

technical field [0001] The invention relates to the technical field of sensors, in particular to a U-shaped optical fiber LSPR sensor based on a silver triangular plate. Background technique [0002] Local surface plasmon resonance (LSPR) refers to localized surface plasmon resonance. When sensitive films such as gold and silver are not continuous, a single metal particle that is not connected to other metal particles appears in a certain area. At this time, the metal particle Surface plasmon resonance will also be generated under the irradiation of incident light. When the vibration frequency of the electromagnetic field generated by the incident light is equal to the vibration frequency of the electromagnetic field generated by the free electrons of a single metal particle, resonance will occur, and the energy of the incident light will be absorbed in large quantities. This phenomenon is known as localized surface plasmon resonance. [0003] In recent years, recent advanc...

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Problems solved by technology

Compared with the traditional prism-type LSPR sensor, the optical fiber LSPR sensor light has the advantages of simple manufacture, low cost, miniaturized structure and anti-electromagnetic interference, so the present invention solves the problem of low sensitivity and accuracy of the existing optical fiber LSPR biosensor Problem, the invention discloses a U-shaped optical fiber LSPR sensor based on a silver triangular plate. The specific structure includes: a U-shaped optical fiber structure, and the U-shaped optical fiber structure includes two multimode optical fibers and a U-shaped multimode optical fiber core. The two ends of the multimode optical fiber core are respectively connected with the multimode optical fiber, the multimode optical fiber core includes a U-shaped bend, the surface of the U-shaped bend is coated with silver triangular plate nanoparticles, and the silver triangular plate nanoparticles are The surface is coated with graphene oxide

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