The Research On The Functional Devices Of Surface Plasmon Polaritons Based On The Subwavelength Structure

With the rapid development of present information technology,the higher demand of the speed,integration and miniaturization of the devices is proposed by human society.However,due to the limitation of the time lag and thermal noise for nanoscale electronic circuit,it has become increasingly unable to meet the demand of information dissemination.Moreover,although the traditional photonic devices have an unparalleled advantage than electronic devices in the transmission bandwidth,it remains a big difficulty to integrated highly on the nanometer scale because of the restriction of diffraction limit.Recently,a novel photonic device based on surface plasmon polaritons(SPPs)appears.Surface plasmon polaritons,which are propagating specific electromagnetic waves at the metal-dielectric interface,have been investigated widely and shown to have great potential applications in the new generation of nano-integrated photonic circuits.The most distinguishing feature of SPPs is to break the constraint of diffraction limit and confine the electromagnetic wave energy to the subwavelength scale.In this paper,we mainly investigate two different micro-nano photonic devices which are consist of the metal waveguide filter and the plasmonic metamaterial absorber.The plasmonic band-stop and band-pass filters with different structures are designed when aiming at the transmission characteristics of surface plasmon polaritons on metal-insulator-metal waveguide.In addition,we can achieve a switch from the single-band absorber to dual-band absorber by utilizing the classical metal/insulator/metal sandwiched metamaterial structure.The finite difference time domain method is used to simulate these structures.The main research works of this paper are as following:The optical filtering properties based on the symmetrical multi-teeth-shaped metal waveguide structure have been systematically investigated.The reasons for the bandgap and projection in dual-teeth-shaped structure are explained in detail from the perspective of phase delay.We have proposed a plasmonic band-stop filter with the symmetrical multi-teeth-shaped structure.The bandgap width and center wavelength of this filter can be adjusted by changing the relevant parameters of the structure.These results may have significative applications on next generatio n high-density nanoplasmonic integration circuits.A novel dual bandgap filter with asymmetrical multi-teeth-shaped structure has been proposed.The widths of the two bandgaps can be adjusted by changing the number of teeth.Besides that,according to the hybrid effects of the first order resonance and second order resonance,we acquire a sharp transmission peak which is within two bandgaps.This peak,which possesses the smallest full-width at half-maximum of 7.5nm,may have some application potentials on wavelength selection filters and lasers.Furthermore,we provide an effective method for adjusting the resonant wavelength of this transmission peak in this paper.A perfect absorber based on the metal/insulator/metal metamaterial structure has been proposed.We can switch a single-band absorber to dual-band absorber by decreasing the thickness of top metallic layer which is perforated by an air-filled ribbon.At the same time,we confirm that the mechanism of this two absorption bands is completely different.Moreover,the influences of the thickness of the middle dielectric layer and the polarization angle of the incident light have been discussed in this paper.Based on the above-mentioned result,a dual-band perfect absorber with the air-filled cross structure has been proposed.The mechanism of this two absorption bands is identical in this structure.