Study On The Transmission Characteristic Of Resonator Based On The Surface Plasmon Polaritons

With the rapid development of information technology, the high speed, miniaturization, and high integration have become the inevitable tendency for components. The photonic components have an incomparable advantage in high speed transmission of massive data over the electronic components. However, the traditional photonic components cannot be effectively integrated with the electronic components, owing to the diffraction limit. As the micro-nano processing technology and integrated optics developed, researchers are trying to explore the mechanism of overcoming the diffraction limit, for the purpose of realizing nanoscale light generation, transmission, and modulation, thus obtaining more rapid and efficient photonic devices. All of these works could lay the foundation for the chip integration of electronic and photonic components, and the all-optical integrated circuits.Surface plasmon polaritons(SPPs) has become one of the research hotspots in nano-optics with its special optical characteristics. SPPs are electromagnetic excitations propagating at the interface between a dielectric and a conductor, the optical fields attenuates exponentially in the perpendicular direction. These electromagnetic surface waves arise via the coupling of the electromagnetic fields to oscillations of the conductor's electron plasma, exhibiting thereby strong subwavelength confinement. The optical resonators have demonstrated great promise as fundamental building blocks for a variety of applications in Si-based integrated circuits. SPPs resonator has attracted great interest due to its subwavelength volume and high Q factor, while simultaneously combining the properties of SPPs with resonant cavity's characteristic.In this thesis, we theoretically investigate the propagation of SPPs for the metal-dielectric-metal(MDM) slot waveguide coupled to a disk cavity. The transmission, reflection characteristics, and the magnetic field distributions are simulated using a finite element method(FEM). The influence of the structure parameters on the spectra of transmission is investigated, to optimize the size of the resonator. Gain medium is incorporated to compensate for the metal loss, which enables the loss-negligible SPPs propagation in near-infrared band, and enhances the performance of the resonator.The THz waves, occupying a large portion of the electromagnetic spectrum between the infrared and microwave bands, are the transitional region between the electronics and optics. We investigate the plasmonic metamaterials on a thin metal film with nearly zero thickness at terahertz frequency. The dispersion properties of the spoof SPPs are modulated by optimizing the geometrical parameters of a planar plasmonic waveguide. The propagation characteristics of a subwavelength planar plasmonic waveguide ring resonator have also been studied. Furthermore, gain medium is introduced to compensate for the propagation loss of the SPPs wave. It is demonstrated that the gain medium provides an enhancement for the control of on/off states of the signal with the presence of pumping. The works mentioned in this thesis pave a way for gain-assisted switching and lasing applications in the near-infrared and terahertz regimes.