The Research Of Mode Coupling In The Microcavity And Micro-nano Photonic Structure

Optical microcavity has important application in the micro-nano photonic devices. It isthe important foundation components of integrated optics and all optical communication. Themechanism of mode coupling and optical control in micro-nano photonic devices based onoptical microcavity have attracted the interests of many people. In our work, the basic prop-erties and potential applications of waveguide-grating structure and waveguide side coupledwith optical microcavity structure are investigated.The main works are given as follows:(1) We investigate optical mode tailoring in a semiconductor microcavity with a metalgrating on top and a dielectric grating on the bottom. Strong coupling between microcavityand grating-diffraction modes is explained in the Fano-coupling model. The Fano resonanceshows a weak dependence upon grating height and duty ratio, but rely strongly upon thegrating period. The microcavity transmission lineshapes are ‘S’ and anti ‘S’-type for themetal and dielectric gratings, respectively. Together with these two types of Fano resonances,the transmission spectra have been tailored into very sharp peaks with full widthes at halfmaximum being up to0.1nm. We prove that this optical mode tailoring method is quiteapplicable for other waveguide-grating structures too.(2) Based on the structure of waveguide side-coupled optical microcavity, we design astructure of waveguide side coupled Jaynes-Cummings chain(JCC). Using a real-space modelHamiltonian, we have theoretically studied the single-photon transmission in a waveguideside coupled with a JCC. The JCC can induce the photon group advancement (GA) and groupdelay (GD) in different frequency ranges determined by JCC eigenmodes. For GA and GD,there exist different optimal JCC lengths. At certain frequency, the GA’s maximum value asusual increases with decreasing the cavity dissipation, whereas the GD’s eventually reachessaturation. For a1.55-μm photon, our calculation indicates that the GD’s maximum value isabout400ps simultaneously with a large transmissivity.(3) Based on the structure of waveguide side coupled optical microcavity, a modelof a multi-band-stop filter is proposed for single-photon transport, using a one-dimensional waveguide side coupled with a series of optical cavities. Its transmission behavior is theo-retically studied by a real-space model Hamiltonian, and is found to depend on cavity modefrequencies, cavity relative phases, as well as cavity number and the coupling strength be-tween the waveguide and optical cavities. With proper cavity-mode frequencies and relativephases, the proposed model shows multi-band-stop regions and a rectangular transmissionspectrum. Based on these phenomena, optical filters with more than one band-stop regionsare simulated with gold material in the THz and communication band.