The Study On The Optical Properties In The Strong Interactions Between Plasmonic Cavity Resonators And Fluoresent Molecules Or Quantum Dots

Investigation on interaction between light and matter is always one of the hottest topics.Various metallic nanostructures could have been designed and fabricated due to the increasing advances in nano-fabrication techniques in the past decades,resulting in a new interest point that study on nano-scale interaction between light and matter.Those noble metal nanostructures exhibit strong nano-scale localization of electromagnetic field and then study on them have grown into a new rapidly growing discipline,called surface plasmonics,which covers the research area of physics,chemistry,material science,information science,biology,nonlinear optics and their inter-disciplines.In this thesis,we will give detailed study on the optical properties in the strong interactions between plasmonic cavity resonators and fluorescent molecules or quantum dots.The thesis is mainly composed of three sections that are shown as following:1.We investigate the optical response of a two-layered core-shell resonator consisting a dielectric core with high refractive index and a thin metal outer shell gapped by a low refractive index thin dielectric layer through Mie scattering theory.It shows a Fano-like resonance in which the electric field can be highly localized within the dielectric gap shell,leading to a very small mode volume 0.001(?/n)3.With linear dispersion model describing the molecular excitons transition,both of the absorption spectums and extinction spectrums show an anti-crossing dispersion relation,which indicate that the coupling between cavity plasmon and molecular exciton has reached strong coupling regime.Furthermore,we propose a one-port assisted three oscillator temporal coupled model to describe the coupling process.The good consistent is shown between the temporal coupled model and Mie scattering theory,which indicates that interactions between cavity plasmons and molecular excitons can be treated as the coupling among three modes.Besides the molecular excitonic dark oscillator,one is a sphere plasmonic bright oscillator with large loss;the other is a cavity plasmonic bright oscillator without loss that make a major contribution to the coupling with molecular excitonic oscillator.In addition,we demonstrate that reducing the thickness and the refractive index of the dielectric gap layer can enhance the interaction between cavity plasmon and molecular excitons.2.We investigate the optical properties of Tamm plasmonic cavity,consisting of metallic mirror,photonic crystal multilayers and dielectric gap layer,and study on the interaction between quantum dots in the gap layer decribed by two-level-system model and Tamm cavity plasmon in the plasmonic cavity.Both of the absorption spectrum and photoluminescence spectrum show Rabi splitting apperances.Rabi splitting value extracted from the absorption spectrum and photoluminescence spectrum in frequency domain is consistent with Rabi frequency obtained from the oscillating population possibilities of two-level-system in time domain,which indicate that the interaction between quantum dots and Tamm cavity plasmon reached strong coupling region.In addition,we fabricate the Tamm plasmonic cavity structure consisting of Ti02/Si02 multilayers,silver mirror and Ti02 gap layer.The angle_resolution reflection spectums distinctly show the properties of the Tamm cavity plasmon.3.We proposed a nano-scale dielectric core/metal shell structure to support study on enhancing and controlling the interaction between hyperbolic cavity plasmon mode(HCPm)and single quantum dot.Analysis of electic field distribution and resonant frequency dependency on structural parameters shows that the nano-scale single pair dielectric core/metal shell structure can be also treated as hyperbolic metematerial,which indicates that the cavity plasmon can be excited in the deep sub-wavelength cavity.The HCPm shows enormous electric field enhancement in the dielectric core with a uniform distribution of amplitudes and phases.By temporal coupled model,the HCPm is shown as a bright mode whose resonant frequency is dependency on the thickness ratio of dielectric and metal and independency on the size of the cavity.Smaller dielectric core can enhance the electric field amplitudes,but larger loss of metal can reduce it.We show that coating dielectric/metal multilayers outside of the cavity can greatly compensate the large loss of metal.