title: Hybrid photonic-plasmonic molecule based on metal/Si disks.
abstract: Optical properties of two identical coupled disks forming a "hybrid photonic-plasmonic molecule" are investigated. Each disk is a metal-dielectric structure supporting hybrid plasmonic-photonic whispering-gallery (WG) modes. The WG modes of a molecule split into two groups of nearly-degenerate modes, i.e., bonding and anti-bonding modes. The oscillation of quality factor (Q) with the inter-disk gap d and significant enhancement at certain inter-disk gaps can be observed. An enhanced Q factor of 1821 for a hybrid photonic-plasmonic molecule composed of two 1.2 μm-diameter disks, compared with that for a single disk, is achieved. The corresponding Purcell factor is 191, making the hybrid photonic-plasmonic molecule an optimal choice for subwavelength-scale device miniaturization and light-matter interactions. Moreover, the far-field emission pattern of the hybrid photonic-plasmonic molecule exhibits an enhanced directional light output by tuning the azimuthal mode number for both bonding and anti-bonding modes.
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, 310027, Hangzhou, China.
authors.forename: Qing
authors.initials: Q
authors.lastname: Wang
authors.forename: Hang
authors.initials: H
authors.lastname: Zhao
authors.forename: Xu
authors.initials: X
authors.lastname: Du
authors.forename: Weichun
authors.initials: W
authors.lastname: Zhang
authors.forename: Min
authors.initials: M
authors.lastname: Qiu
authors.forename: Qiang
authors.initials: Q
authors.lastname: Li
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008422:Materials Testing; D008670:Metals / Q000737:chemistry*; D017785:Photons; D012825:Silicon / Q000737:chemistry*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D008670:Metals; D012825:Silicon