Study On The Influence Of Nanostructure On LSPR Sensing Performance And Its Optimizatio

To study the sensing performance of local surface plasmon resonance(LSPR)more comprehensively,reduce the dielectric loss of the sensor,improve the sensitivity of the refractive index of the sensor,and extend the application range of the nano-plasma sensor.LSPR sensing is discussed from four aspects:sensitive materials,surface lattice resonance(SLR)and collective lattice resonance(CLR),array nanostructures,and single molecule detection.In the discussion of sensitive materials,a discussion Mie-like scattering model was designed and simulated.Its extinction spectrum and sensing characteristics were calculated and discussed by changing the type of material constituting the model.In the discussion of SLR and CLR,the finite difference time domain(FDTD)method is used to establish a simulation model.The model keeps the periodic element structure consistent with the array structure.The control variable method is used to study the mass factor as a function of the number of particles(N)along each dimension of the array and to discuss the relationship between the array size and Q value of the metal and non-metallic materials.The sensing performance of the array composed of traditional metal materials is better in terms of dielectric loss and sensitivity.However,the multimode coupling resonance of the array composed of silicon made of non-metallic materials is more uniform.This feature is also reflected in the research and discussion of SLR and CLR.The resonance generated by the silicon array coupling in all dimensions is shown as a single resonance peak.Through a series of simulation calculations,the dielectric loss of a one-dimensional polarization array is the smallest.In terms of the optimization of LSPR sensing performance of nanostructures,based on the sensing characteristics of high sensitivity and high-quality factor of Fano resonance and nano-plasma effect,a sub-wavelength dual-ring nano-antenna refractive index sensor based on the combination of glass and bimetal layer is proposed and explored.The nanoscale plasma sensor structure is composed of a periodic asymmetric ring cavity array,a spacer layer,and a metal thin film layer,which can generate Fano resonance in the infrared region(IR).The reflection spectrum of the structure was calculated by FDTD.Because the addition destroys the symmetry of the structure,the reflection cross-section changes with the spatial parameters.The polarization mode can also be adjusted by the polarization of the light source,which will improve the sensitivity of the sensor indication.The nanoscale plasma sensor structure with a high-quality factor(Q)of 100 and full width at half peak(FWHM)of 10 has been realized.In terms of LSPR sensing performance and single molecule detection performance,the single molecule biosensor based on gold nanopore array structure has high sensitivity and selectivity,in which the nanoparticles match the electric field enhancement region of the detection size.The complex biological detection environment puts forward higher requirements for the real-time and sensitivity of single molecule detection technology.To meet the requirements,the shape parameters of small molecular weight proteins are considered,and the simulation model is established using the finite-difference time-domain(FDTD)method.There are surface plasmon polaritons(or propagating plasmon))and local surface plasmon resonance(LSPR)in gold nanopore arrays,which exhibit strange optical EOT.For the positive correlation sensing method,the shape and size of the nanopor sensor with a period of 400 nm,a radius of 100 nm,and a thickness of 200 nm have the best protein parameters.Displacement of resonance wavelength(Δλ)It is also a relatively important parameter.Δλ is greater than 5 nm.For the positive correlation sensing method,the gold nanopore array with a period of 450 nm can provide a Δλ up to 20 nm。...