Lasing And Rabi-splitting In Plasmonic Lattices At Weak And Strong Coupling Regimes

Plasmonic Lattice Resonances(PLRs),also known as Surface Lattice Resonances(SLRs),are light-matter mixed states that appear in periodically arranged metal nanoparticles(NPs).When the array spacing of the periodic array is on the sub-wavelength scale,incident photons will be collectively scattered,a standing wave will be generated to obtain a diffracted wave mode.If the diffraction wave mode propagating in the plane coincides with the localized surface plasmon(LSP)mode of a single nanoparticle in the time domain,the coupling between the modes will cause the constructive and deconstructive interference.The resonance mode of Fano peak shape is called PLRs.And the half-width of resonances in the spectrum is reduced to 1-2nm.The characteristics of plasmon lattice resonances come from two different physical effects;the electromagnetic response of metal NPs(plasmon resonance)and the Bloch diffraction mode associated with the NPs array.At the same time,the interaction of light and matter has always been one of the core topics in optical research.Plasma lattices overcome the optical diffraction limit of traditional optical microcavities and the problems of metal radiation loss in plasmon microcavities.It has a highquality factor,small model volume,and series of advantages,which make it become a new type of nano-microcavity with great application prospects.(1)The theoretical work on plasmon surface lattice resonance,including the empty lattice approximate model,the coupled dipole approximate model,and the Fano resonance model.It describes the plasmon lattice resonance in detail.Principles,lattice parameters,and metal nanoparticle structure control the resonance mode and the reason for the asymmetric line shape.Two plasmon lattice structures,metal nanodisks,and aluminum nanocones,are designed,and the resonance modes of the plasmon lattice are adjusted and their optical and electrical properties are analyzed through simulation.(2)The principle and research status of plasmon amplified spontaneous emission(ASE).Based on the simulation results in Chapter 2,we first study the interaction of light and matter between the plasmon lattice and the phosphor.The system studies the amplified spontaneous red light radiation process of the rare earth up-conversion nanocrystal with multiple metastable energy levels under the control of PLR,and its optical properties such as: ASE magnification,emission direction and luminescence relaxation time system are carried out.(3)The composite structure of aluminum nanocone array and Nile red fluorescent dye is designed,and the nano-lasing phenomenon based on the propagation state off-angle plasmon lattice resonance is obtained for the first time.Later,it depends on the polarization characteristics of the lasing phenomenon and the lattice arrangement.(4)By covering a layer of two-dimensional transition metal sulfide on the two-dimensional array structure,a strong coupling system of exciton and plasmon lattice resonance is successfully obtained.The finite difference time domain method(FDTD)and the full quantum model are used to quantitatively study the modulation of the coupling strength,split size,and time dynamics of the plasmon lattice resonance system.