| Since the Ebbesen research group observed the extraordinary transmission (EOT)phenomenon of light on metallic subwavelength periodic hole arrays in U.S. at1998,the physical mechanism of extraordinary transmission phenomenon of light waves onsubwavelength metal structures and its applications have always been research hotspots. A variety of novel phenomena caused by the interaction of light withsubwavelength metal structure, the surface plasmon polaritons (SPPs) played a crucialrole. Therefore, to understanding and exploration the SPPs’ excitation, propagationlaw and the control means will to deepen and enrich to understanding of theinteraction of light with subwavelength metallic materials. Moreover, devise andresearch the micro-nano optoelectronic devices, which based on the SPPs, willpromote the research progress of the new generation of micro-optoelectronic devicesand optoelectronic integrated and all-optical circuit, etc. Aim at the physicalproperties, control means and related applications of the SPPs in subwavelength metalstructures, in this thesis, we using the finite-difference time-domain method (FDTD)carried out a systematic study. The main research works and conclusions are asfollowing:We systemically explore the propagation properties, artificial regulationbehaviors and the related optical properties of SPPs in subwavelength metal gratingstructures by using the FDTD method. By investigate the transmission spectra andfield distributions of the single slit, single slit filled with media, double slit, multiplecompound silt with groove, ternary conpound metal grating and oblique incidencestructures, find that the SPPs and Fabry-Perot (F-P) cavity like resonance are the mainmechanism of the EOT phenomenon. Besides, the phase resonance has a certainimpact of the transmission spectra in the multiple slits structures, for example it canlead to the split.The interaction of electromagnetic waves and surface plasmon subwavelengthcomposite metal gratings are studied by using the numerical simulation method atvisible to near infrared band. Mainly include the dispersion characteristics of thesubwavelength metal grating structures and the transmission characteristics ofelectromagnetic waves, light intensity distributions, phase distributions and physicalproperties. According to various characteristics of the electromagnetic waves in subwavelength composite metal gratings, we propose a double-slit compound periodicmetal grating structure which include a vertical incision in each slit, the interaction ofelectromagnetic waves with this structure and light transmission variouscharacteristics are investigated. It is found that if the distribution of the verticalincision in the two slit asymmetries, the electromagnetic wave transmission modes(even/odd waveguide modes) in the structure will appear different properties.Especially, transmission spectra of the composite periodic structures appear atransmission minimum (dip) under certain conditions, the position of the dip can bechanged by tuning the cuts in the slits. We use the phase resonance principlereasonable to resolve the various physical properties of electromagnetic waves withvertical incision double slit subwavelength periodic composite metal grating. It is alsoproved that the geometry of the vertical incision can influence the phase resonance,combined with the field distribution to discuss these physical properties.Based on the properties of SPPs, investigated the interaction and transmissioncharacteristics of electromagnetic waves with the metal-insulator-metal (MIM)waveguide structures. According to the characteristics of SPPs in the MIM waveguidespecially in the MIM waveguide structure, we proposed a novel ipsilateraldouble-teeth shaped MIM waveguide structure. By depth study of the properties of theSPPs in this waveguide structure, it is find that this type MIM waveguide structurecan realize the typical filting function. The filtering frequency and bandwidth can betunned by adjusting the geometry of the two teeth, such as the length, width andcenter space between the two teeth. The case of simply changing the width of onetooth with the other one unchanged, we find that the band gaps of the structure of thefilter can effective regulation. We use the phase multiple destructive interferenceprinciple to reasonably resolve these physical properties. Because of thesubwavelength MIM waveguide filter bandwidth is adjustable, the structure willprovide a certain reference value to design highly integrated nanophotonic devices.Propose a multiple disk shaped coupled cavities metal-insulator-metal (MIM)waveguide sturcture and explore the transmission and the couple properties betweenoptical cavities with the same radius and different radius by2D FDTD method. Thetransmission surface plasmon waves will appear splitting modes in the coupled cavityMIM waveguide system when the radiuses of the disk cavities are the same. Thecoupled cavity systems produce the same number of spitting modes as the number ofdisk cavities. Among our findings, it is interesting to notice that there is a leak modein a coupled cavity system consisted of a cavity with two same cavities with different radius on the shoulder of it. The results are useful for the design of cavity-basedevices for integration in nanophotonics. |
PDF Full Text Request