Open AccessMetallo-dielectric hybrid antenna for high Purcell factor and radiation efficiency
Author(s) -
Xianghao Zeng,
Wenhai Yu,
Peiju Yao,
Zheng Xi,
Yonghua Lü,
Pei Wang
Publication year - 2014
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.22.014517
Subject(s) - radiation , purcell effect , optics , materials science , antenna (radio) , antenna efficiency , optoelectronics , dielectric , context (archaeology) , spontaneous emission , radiation pattern , raman spectroscopy , physics , laser , telecommunications , paleontology , computer science , biology
Based on multisphere Green's function, we investigate the interaction between a dipole source and a hybrid nanoantenna. The parameter of radiation enhancement factor is introduced to characterize spontaneous emission enhancement and radiation efficiency simultaneously. We revisit the emission of silver dimers in the context of radiation enhancement factor. Then the hybrid of metallic nanoparticles (MNPs) and dielectric nanoparticles are designed for strong enhancement as well as high efficiency. Purcell factor over 2000 and radiation efficiency over 50% are achieved by the hybrid antenna. And Purcell factor above 900 with over 57% radiation efficiency is also reached for broadband operation. Such metallo-dielectric hybrid antenna may find potential applications in bright single photon sources and Raman spectroscopy.