| The optics of surface plasmon,which is an emerging discipline on the properties andapplications of surface plasmon polaritons(SPPs), has delivered a number of importantapplications:nano-optics, near-field optics, spectroscopy, sensing technology, integratedphotonics. Metal-insulator waveguides and waveguide components is committed toresearch for which integrated photonics components with comparable dimensions of LSIcomponents can be achieved on the field of surface plasmon circuit, which is a hotresearch field in recent years and has made a lot of achievements. Loss in propagation ofSPPs is becoming major difficulty faced in the field. Reliable device design of SPPsamplifier has not yet appeared.It is proposed that surface plasmon amplification by stimulated emission of radiation(SPASER) bistable amplifier can be designed in a metal-insulator-metal(MIM)waveguide,by which amplification of SPPs digital signal is achieved.First of all,by simulation studying the propagating properties of serial stub structurein MIM waveguide, equivalence nano-cavity is constucted in the waveguide. Eigenmodetheory about equivalence nano-cavity is proposed based on analyzing the distribution ofthe field of the equivalence nano-cavity. Coupling relationship between localized field ofthe equivalence nano-cavity and propagating field in the waveguide is builded by retardedGreen’s function.Secondly, the model is studied that the gain medium is added to nano-cavity. Thegain medium is described by two-level model of particle stimulated emission based ondipole approximation. The quantization of the localized field of the nano-cavity is basedon the eigenmode theory about equivalence nano-cavity. Optical Bloch equations of thesystem is based on rotating wave approximation,which confirm that the system isSPASER.It is simulation studied that the spasing curse of SPASER is affected by theimportant parameters:the wavelength of signal,the dimensions of the structure, density ofthe gain medium chromophores,the rate of the saturable absorber to the gain mediumchromophores. the model in which the saturable absorber is added to the gain medium is further researched.The dynamic characteristic of the excitation and relaxation process inthe physical model is simulation studied with the same form of the optical Blochequations.The bistability of the model is expounded by the relation of the initial number ofthe polaritons and the stable states of the SPASER with pulse pump.It is demonstrated thatthis structure can be used as bistable amplifier for SPPs digital signal.The prototype device of SPASER bistable amplifier in waveguide is designed basedon the aforementioned physical model. The structural design and production process isgiven. The effect of material properties and the choice to the amplifier performanceparameters is discussed.The designed prototype device has subwavelength scalewaveguide structure, which is comfortable to be intergated, has subpicosecond responsetime, which can be used in ultrafast information systems, has THz level bandwidth andthreshold amplifier features, which suit the amplification for SPPs digital signal.It is one of the core problems in the field of surface plasmon circuit that losslesspropagation of SPPs signal carry out in waveguide. The currently a lot of researchedsynchronous compensation scheme whose results have a great distance from the practicalapplication, has stability problem in theory. The SPASER bistable amplifier array withwaveguide structure is designed.It is a new proposal for lossless propagation of SPPssignal that the transmission is relay amplified by amplifier, which avoid stability problemof loss compensation.Surface plasmon resonance(SPR) technology, which is developed with the researchof the optical excitation of SPPs,has important and widely applications in the field ofsensing technology, especially in the field of biochemistry sensing.A SPR biosensor withnanoparticles enhancement is designed.And fiber loop demodulation technique isproposed.The designed sensing system with high sensitivity, quasi-real-time response andwide dynamic range, is suitable for biochemical reaction kinetics measurement.A possbleapplication of the SPASER bistable amplifier is showed by the waveguide loopdemodulation SPR sensing system based on the same principle. |
PDF Full Text Request