Investigation On The Performance Of Micro-nanophotonic Components

Micro-nanophotonics is a discipline that studies the interaction of light and matter at the micro-nano scale,and the generation,transmission,regulation,detection and sensing of light.In this paper,the performance and structure design of two kinds of components in micro-nanophotonics,integrated metal nano-antenna and cavity structure of superconducting nanowire single photon detector,are studied.Emphasis has been placed on the following areas:Firstly,the related principles and mechanism of surface plasmons are analyzed.The localized surface plasmon resonance theory applicable to spherical nanoparticles is introduced.For other geometric nanoparticles,two numerical simulation methods,discrete dipole approximation and finite-difference time-domain method,are introduced.The waveguide evanescent wave is analyzed.Based on the theory of waveguide spectroscopy,the extinction spectra of localized surface plasmon resonance of integrated metal nano-antenna can be obtained.Secondly,the optical characteristics of the integrated cross bowtie nano-antenna are discussed by using the simulation software FDTD Solutions.The dipole plasmon resonance and its sensitivity of the integrated horizontal bowtie nano-antenna are analyzed,and the maximum local field enhancement of the integrated vertical bowtie nano-antenna are analyzed.The tunable dipole plasmon resonance wavelength and tunable maximum local field enhancement of the integrated cross-tie nanowires are analyzed,and a conclusion is made that the tunable dipole plasmon resonance wavelength and the tunable maximum local field enhancement are obtained.The resonance wavelength sensitivity is analyzed and the effects of the processing error on the tunable performance of the integrated nano-antenna are considered.Then,the superconducting nanowire single photon detector is introduced.The zigzag geometry structure,working process and device materials of superconducting nanowire are introduced.The performance of single-photon detectors and the relationship between them are analyzed.Three modules of the system integration scheme of superconducting nanowire single photon detector are described in detail: single photon detection module,electrical module and optical module.Finally,a simplified Bragg reflector is designed to enhance the absorption efficiency of superconducting nanowire Nb N.The simplified Bragg reflector is composed of six periods of Bragg mirror and a single layer of metal film.The influence of superconducting nanowire Nb N structure on the absorption efficiency and the polarization extinction ratio of superconducting nanowire single photon detector is analyzed.The optimal Nb N structure is determined: the width is 75 nm,the thickness is 8 nm,the period is 125 nm.The polarization extinction ratio of superconducting nanowire single photon detector is greatly reduced by introducing high refractive index Si dielectric thin films.