Enhanced light–matter interaction in a hybrid photonic–plasmonic cavity

Abstract

Strongly concentrated optical fields around a metal nanoparticle in the close vicinity of a dipole noticeably facilitate dramatic changes in the localized density of states due to hybrid photonic-plasmonic mode couplings as compared to that of the pure cavity mode fields. Significant variations of the field intensity in the presence of the metal nanoparticle elucidate enhanced light-matter interaction in a hybrid structure. The enhancement factor of the light-matter interaction is studied through the single-atom cooperativity parameter, which is directly proportional to the ratio of the fluorescence lifetimes of the off-resonant and on-resonant emission. A compact and cost-effective hybrid device, which includes a microfiber cavity, supporting whispering gallery modes, and a well-defined solid nanostructure, consisting of a gold nanoparticle core, overcoated by a silica shell, and decorated with CdS/CdSe quantum dots, is demonstrated to offer an outstanding potential for the enhancement of light-matter interaction. Surface plasmons of a gold nanoparticle, placed inside a hollow cylindrical nanostructure at the surface of a microfiber, are activated upon excitation of the dipoles of the quantum emitters, which are on-resonance with the whispering gallery mode. Time-resolved experiments demonstrate that the single-atom cooperativity parameter of the quantum dots is enhanced by a factor of about 4.8 in the presence of the gold nanoparticle being simultaneously in strong interaction with the cavity mode field and the metal nanoparticle's surface plasmons.

A hybrid photonic-plasmonic resonator based on a partially encapsulated 1D photonic crystal waveguide and a plasmonic nanoparticle

“…In the scientific literature, various hybrid photonic-plasmonic structures have been demonstrated to enhance spontaneous emission rate of the fluorescent quantum sources [ 53 , 54 , 55 ]. Some conceptually successful hybrid resonators based on 2D photonic crystal cavities with plasmonic nanoparticles have also been unveiled to enhance radiation efficiency [ 26 , 27 ].…”

Tamm phonon-polaritons triggered in hyperbolic material hexagonal boron nitride

“…Enhancing the light-matter interactions has been a key concern [1][2][3][4]. In recent years, various electromagnetic surface modes have been studied and used to improve light-matter interactions [5][6][7][8][9][10]. For example, surface plasmon polarizations (SPPs) [11][12][13][14][15], surface phonon polarizations (SPhPs) [16,17], and Tamm plasmon polaritons (TPPs) [18,19].…”

Plasmonic switch based on asymmetric cavities with embedding square of gold inside the cavities

“…One of the important and interesting approaches for the implementation of plasmonic switches is the optical nonlinear Kerr effect. Plasmonic switches are implemented based on cavities, 16 – 18 Mach–Zehnder interferometers, 19 , 20 directional couplers, 21 , 22 and ring resonators 23 – 26 However, to the best of our knowledge, the implementation of a plasmonic switch using the nonlinear Kerr effect and the inherently nonlinear characteristics of the gold has remained unaddressed so far, and hence has been the focus of study in this paper.…”