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Research On Amplification And Lasing Of Surface Plasmon Polaritons In The Micro And Nano Structure

Posted on:2015-06-21Degree:DoctorType:Dissertation
Country:ChinaCandidate:J ZhuFull Text:PDF
GTID:1228330452454522Subject:Control Science and Engineering
Abstract/Summary:PDF Full Text Request
Surface plasmon polaritons (SPPs) are weakened along the metal–dielectricinterface. SPPs represent the evanescent field in vertical interfaces. Generally, boundelectromagnetic waves rapidly decay in metal and dielectric. Currently, the propertiesof SPPs have attracted considerable attention from the academia. SPPs have wideapplications because of their specific properties, such as asymptotic energy in thedispersion curve, resonance, field amplification and localization, and strong surfacehigh-capacity sensing. They can also overcome the limitation of sub-wavelength. Inthis study, micro/nano scale waveguide structures are used as research foundation, andthe propagation characteristics of amplification and lasing of SPPs on the basis ofwaveguide structures are analyzed. The results of this study elucidate the applicationsof plasma chip and optoelectronic integration.The paper is organized as follows. The basic parameters of SPPs are defined, andthe properties of electrical excitation and photoexcitation are studied. Dispersionrelation and four important feature lengths of SPPs are examined in theory. Theproperties of the electron beam excitation of SPPs on the basis of metallic grating arestudied, and the coupling characteristics and local field enhancement of this structureare determined. Results show that the propagation wave vector of SPPs can becontrolled by adjustment of the grating period. Two ATR models are used in thetheoretical analysis of the properties of SPP photoexcitation. The commonly usedKretschmann coupled model is employed, and the reflectivity of this model is obtained.Changes in resonance angle are analyzed by observation of the curve andidentification of the principle related to the changes in the sample.The properties of MIM, MSM, strip, and double-layer medium waveguidestructures are studied. Theoretical analysis and numerical verification are performed.Results show that the surface plasmon wave produced by two metal–dielectricinterfaces of the MIM structure is coupled in the dielectric. The electromagnetic fieldis highly restricted within the dielectric, but its energy attenuation is relatively fast. The localization of the MSM structure is enhanced, and gain compensation isrepresented by the semiconductor ZnO. The periodic grating of strip waveguidestructures can compensate for the loss of the near field of the metal film. Thedouble-layer medium waveguide structure improves the localization of theelectromagnetic field of the signal interface and compensates for the loss ofpropagation.An Au nanowire structure covered with MgF2layer is designed, and therelationship between the field and electromagnetic force produced by the surfaceplasma wave in metal wave is investigated. The electromotive force of the metalnanowire structure is analyzed by theory, and the growth process of the Au nanowire isinvestigated. Electromagnetic force increases as the incident light frequency comesclose to the resonance frequency of surface plasmon polaritons (SPPs). Thelocalization of the Au nanowire structure is enhanced, and the magnitude ofelectromotive force can reach1V. The nanowire structure represents fieldamplification.A metal–insulator–metal structure embedded by a saturation absorber isdesigned and discussed, and it represents surface plasmon amplification. Stimulatedemission conditions are analyzed by theory, and the fabrication of devices on the basisof the current status of nano-lithography is designed with the use of metallic filmpreparation technology. Experimental and test systems are then designed. Calculationresults verify that improving the structure does not affect the localization of SPPs.The gold nanoparticles of the sample are approximately150nm, and it meets thedesign requirements. Designing devices can address the internal feedback problem ofamplifier devices and represent advantages in the loss compensation aspect.
Keywords/Search Tags:surface plasmon polaritons, micro/nano wave structure, metal nanowire, strong locality, gain medium, loss compensation, nanolithography
PDF Full Text Request
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