posted on 2021-05-27, 11:35authored byZhaogang Dong, Sergey Gorelik, Ramón Paniagua-Dominguez, Johnathan Yik, Jinfa Ho, Febiana Tjiptoharsono, Emmanuel Lassalle, Soroosh Daqiqeh Rezaei, Darren C. J. Neo, Ping Bai, Arseniy I. Kuznetsov, Joel K. W. Yang
Dielectric
nanostructures have demonstrated optical antenna effects
due to Mie resonances. Previous work has exhibited enhancements in
absorption, emission rates and directionality with practical limitations.
In this paper, we present a Si mix antenna array to achieve a trifecta
enhancement of ∼1200-fold with a Purcell factor of ∼47.
The antenna design incorporates ∼10 nm gaps, within which fluorescent
molecules strongly absorb the pump laser energy through a resonant
mode. In the emission process, the antenna array increases the radiative
decay rates of the fluorescence molecules via a Purcell effect and
provides directional emission through a separate mode. This work could
lead to novel CMOS-compatible platforms to enhance fluorescence for
biological and chemical applications.