Preparation And Sensing Properties Of Self-assembled Plasmonic Metal Array Fiber Optic Sensor

In the past few decades,biosensors have attracted close attention due to their wide range of industrial and scientific applications.Optical sensors are an effective analysis tool to solve these applications by studying the optical properties of structures.With the advancement of technology and the increasing demand for resources,high-tech equipment gradually tends to be miniaturized.The interaction of light and metal nanostructures shows unique properties,creating a new field called surface plasmons.The fusion of metal nanostructures with optical fibers can form an optical fiber biosensor with high sensitivity and resistance to electromagnetic interference.This type of optical fiber sensor can obtain analysis information by monitoring the change of resonance wavelength.This paper proposes three different metal nano-periodic array structures on the fiber end faces,and explores and studies the corresponding surface plasmon resonance modes,parameter optimization,preparation technology and sensing characteristics.Specific research work includes:An optical fiber sensor using gold nanodisc as the sensing structure is proposed.Firstly,the finite difference time domain method is used to understand the various surface plasmon resonance modes and optimize the parameters of the structure.Then the preparation process and test results of the experiment are given.During the change of the ambient medium around the sensing structure from air to glycerol,the resonance wavelength was shifted,and the highest sensitivity in the experiment was 326 nm/RIU.Two fiber optic sensors using periodic silver nano-arrays as the sensing structure are proposed.The experimental conjecture is given and the surface plasmon resonance mode is explored through simulation software,and then the parameters of the structure are optimized.The optimized structure simulates different background refractive indices(1.331 to 1.47),and the sensitivity of the first silver nanoring structure is 539.6 nm/RIU,and the sensitivity of the second silver nanopore structure is 317 nm/RIU.The former has higher sensitivity in simulation than the latter,but the latter has higher quality factors,indicating better stability.