Research On Surface Plasmon Polaritons Mechanism Of Subwavelength Metal-Insulator-Metal Optical Waveguide

With the development needs of integrated photonic devices,people have put forward more requirements for photonic devices,including the size requirements of the device.Due to the limitation of the diffraction limit,in the sub-wavelength range,the signal is difficult to be carried by traditional photonics technology.Therefore,how to expand the diffraction limit,how to integrate,high-speed,and functionalize the sub-wavelength optical device become the research focus of the optical field.Therefore,micro-nano photonics has become the focus of research.The research of surface plasmon provides some better solutions for the realization of nano-scale integrated photonic circuits.Surface plasmon is a kind of evanescent wave that propagates on the interface between metal and medium,and is bound to the surface of the metal.The energy of the electromagnetic field will be limited to the nanometer range due to the surface plasmon.New surface plasmon functional devices,especially metal-dielectricmetal waveguides,have huge application potential in the fields of optical transmission and optical sensing.Therefore,the focus here is on the research of the spectral characteristics and control of microphotonic devices and sub-wavelength devices,including the study of the physical phenomena related to the surface plasmon wave and the spectrum and the design of functional devices.This article is a summary of the author's work on the above-mentioned surface plasmon research during his master's degree,divided into four chapters.The specific content is arranged as follows:Chapter 1: Introduce the research background of nanophotonics and surface plasmons;initially briefly introduce the definition of surface plasmons,describe the special properties of surface plasmons,and briefly summarize the research status at home and abroad.Application fields and prospects of surface plasmons.Chapter 2: Theory introduces two-dimensional and three-dimensional simulation methods of surface plasmon waves-the time-domain finite difference method.Chapter 3: Mainly consists of four parts.In the first part,a semi-circular rectangular composite resonator(SARCC)structure based on MIM waveguide is proposed.We appropriately add the rectangular cavity to the half-stacked ring structure cavity(SAC),which can realize the mode interaction to produce a similar single PIA window or double PIA window.In the second part and the third part,a semi-rectangular rectangular displacement cavity(SRRCC)structure based on MIM waveguide and a rectangular rectangle are studied respectively.The proposed structure realizes multiple Fano resonances with high feedback sensitivity and FOM,and the corresponding phase shift and delay time inside the Fano resonance window also cause corresponding research and calculations.In the fourth part,a multi-channel Fano resonant structure is proposed.By setting an appropriate resonant cavity at the displacement position of the MIM waveguide,we can obtain the Fano mode transmission peak of the expected wavelength at each output waveguide.Chapter 4: Summarize and research prospects of this paper.Summarized the research content and achievements of this paper,and looked forward to the next research on surface plasmonic polaritons.