Open AccessAccumulation and directionality of large spontaneous emission enabled by epsilon-near-zero film
Author(s) -
Xuening Duan,
Fan Zhang,
Zhiyuan Qian,
Hao He,
Shan Li,
Qihuang Gong,
Ying Gu
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.007426
Subject(s) - optics , materials science , nanorod , near and far field , spontaneous emission , common emitter , wavelength , plasmon , optoelectronics , permittivity , nanophotonics , purcell effect , physics , photon , nanolaser , blueshift , laser , dielectric , lasing threshold , nanotechnology , photoluminescence
We demonstrate the spectral accumulation of large spontaneous emission (SE) for nanocavities with different sizes in the coupled Ag nanorod and epsilon-near-zero (ENZ) film system. This effect originates from the slowing down of the spectral shift of resonant nanocavities at the wavelength where the permittivity of the substrate vanishes, i.e., the resonance "pinning" near the ENZ frequency. In addition, most far field radiation of the emitter is concentrated in the forward field with small solid angle due to the impedance mismatch between the ENZ film and the free space. This kind of size-relaxed nanocavity for directional SE has potential applications in the bright single photon sources, plasmon-based nanolasers, and on-chip nanodevices.