Multiphysics Simulation Of Periodic Structures In Photonic Devices

With the development of semiconductor technology,microelectronic devices has been gradually miniaturized.The ability of electronic circuits to transmit digital signals based on electronic transport is challenged and limited greatly.However,the photon circuits based on optical fibers can transmit digital signals at high speed,but the photonic devices and the microelectronics circuit cannot be integrated and matched effectively due to their sizes.When the structure size of the micro optoelectronic device is reduced to the nanometer scale,the transmission,control and other aspects of electromagnetic waves are restricted by the limit of classical diffraction.It is very difficult for the microoptoelectronic device to realize in the wavelength of light wave and even smaller than light wavelength.Therefore,one of the key technologies to realize the integration of micro-optoelectronic devices is to realize the modulation of electromagnetic waves within a range less than the wavelength of the electromagnetic wave and to break through the classical diffraction limit of electromagnetic wave transmission.In the interaction between electromagnetic waves and nano-sized metal structures,in order to realize the control of electromagnetic waves at nanometer scale,surface plasmons polaritons(SPPs)or surface plasmons(SPs)play a crucial role.SPPs are a kind of surface excited evanescent wave which produces a collective oscillation when the free electrons in the metal surface match the frequency of the photons in the incident electromagnetic wave.This evanescent wave propagates along the interface between the metal and the dielectric materials,causing the phenomenon of extraordinary optical transmission(EOT).In this dissertation,the phenomenon of EOT,which is influenced by periodicity,thickness,slit width of single-slit and double-slit subwavelength periodic metallic gratings and temperature,is studied by using the alternating direction implicit finite-difference time-domain method(ADI-FDTD).At the same time the effect of this phenomenon on the light absorption energy of solar film cells is studied.The dispersion of the metal is expressed by the Drude model and solved with a generalized auxiliary differential equation(ADE)technique in multiphysics simulation.