Studies On The Optical Properties Of (Quasi) Periodical Structure And Its Applications On Micronano-device Design

With the increasing maturity of nanotechnology and manufacture, photonics areundergoing unprecedented development, many new interdisciplinary and researchfields are emerging. In the worldwide, surface plasmon polaritons (SPPs) andphotonic crystal are considered as two promising ways to potentially realizephotonic integrated devices. Their developments have intrigued many newphenomena that cannot occur in the traditional optics. In this dissertation, opticalproperties of the (quasi)periodical structure in plasmonics and photonic crystal areinvestigated. Based on the optical properties, various kinds of new micronanophotonic devices for different applications are proposed and designed.The main contents of this dissertation are as follows:1. One-dimensional periodical fiber Bragg gratings are investigated and thecoupled-mode equations are derived. A new grating synthesis method isproposed. It is simple and fast, can optimize the grating parameters oneinterested, and overcome the shortcomings of the traditional discrete layerpeeling method that cannot effectively reduce the refractive index modulation ofBragg gratings. With the proposed method, multichannel andtriangular-spectrum Bragg gratings are designed, respectively.2. The dispersion relation of the metal-insulator-metal (MIM) structure is studied.It is found that with the excitation of the SPPs, MIM structure can manipulatethe light at nanoscale size. By means of introducing quasiperiodical chirpstructure and apodiztion structure to the MIM waveguide, a broadband and lowsidelobe plasmonic reflector is realized. Meanwhile, by inserting two dielectricsin the MIM waveguide and arranging them with Fibonacci sequence,multichannel plasmonic filter is achieved.3. Based on the MIM structure, a new kind of T-shaped waveguide is proposed. Itconsists of dual nanocavities which can excite two different resonate frequencies,thus unidirectional manipulation of optics is realized.4. The absorption properties of the metallic nanostructure with periodical air-hole arrays are investigated. When an electromagnetic wave is impinged to theproposed structure, magnetic response appears and excites two antiparallelcurrents in upper and lower metallic layers. By changing the structure geometryparameters, permeability is tuned. So impedance between the metamaterials andthe air can be matched, thereby perfect absorption is realized. Further studiesindicate that when middle dielectric spacer of the metallic nanostructure isnonlinear Kerr material, all-optical absorption switch can be achieved.5. The properties of Tamm polaritons in a metal/periodical photonic crystal arestudied. One-dimensional quasi-periodical photonic crystal composed of a thinmetallic layer and dielectric Fibonacci multilayers is proposed. The transfermatrix and the finite-difference time-domain results demonstrate that thestructure is able to excite multiwavelength Tamm polaritons.