Mode, Spectrum And Near Field Of One Dimensional Sub Wavelength Dielectric And Metallic Grating And Applications

In this dissertation, optical mode properties of one dimensional sub-wavelength gratings are solved, and a high-pass and band-pass filter are designed. The transmission, reflection and absorption spectrum of one-dimensional subwavelength metallic grating are studied, the spatial distribution of surface plasmons, the spatial coupling characteristics of surface plasmon polaritons are discussed. A novel atomic trapping scheme with a one-dimensional subwavelength metallic grating is proposed, in which the intensity and the optical potential are obtained.The characteristic equation of the effective index function is obtained by the vector modal theory. We take the decay characteristics of mode to design and analyze a subwavelength grating high pass filter under the Littrow incident condition, and the response curve of the dependence of reflectivity of grating on wavelength is investigated. In addition, two gratings are composed and designed for a band-pass filter.The transmission spectrum, the reflection spectrum and the absorption spectrum of one dimensional subwavelength metallic grating are studied, and the influence of the geometrical parameters of the grating on the absorption spectra is analyzed. The near field intensity distribution of the surface plasmon of the one-dimensional subwavelength metallic grating, and the spatial coupling characteristics of the surface plasmon are studied.we propose a scheme to generate one-dimensional dark hollow lattices for cold atoms at the nanometer scale by surface plasmons excited on the periodic metallic subwavelength strips with the blue-detuned light. The distribution of SP intensity and optical potential for atoms are investigated, and closed contour lines of optical potential can realize the effective trapping of cold atoms. Due to the high intensity gradient in the dark nanoscale region, atoms can be cooled to several μK with efficient intensity-gradient Sisyphus cooling.The research on optical mode properties of one dimensional sub-wavelength gratings, the high-pass and band-pass filter, the spectrum, the spatial distribution of surface plasmons and the atomic trapping scheme provides an important theoretical fundament for the research of micro/nano optics, atom optics and quantum optics.