Premium
Directional Modulation of Exciton Emission Using Single Dielectric Nanospheres
Author(s) -
Fang Jie,
Wang Mingsong,
Yao Kan,
Zhang Tianyi,
Krasnok Alex,
Jiang Taizhi,
Choi Junho,
Kahn Ethan,
Korgel Brian A.,
Terrones Mauricio,
Li Xiaoqin,
Alù Andrea,
Zheng Yuebing
Publication year - 2021
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.202007236
Subject(s) - materials science , nanophotonics , exciton , optoelectronics , dielectric , excitation , photonics , reconfigurability , light emission , modulation (music) , purcell effect , exciton polaritons , wavelength , optics , laser , polariton , spontaneous emission , physics , telecommunications , quantum mechanics , computer science , acoustics
Coupling emitters with nanoresonators is an effective strategy to control light emission at the subwavelength scale with high efficiency. Low‐loss dielectric nanoantennas hold particular promise for this purpose, owing to their strong Mie resonances. Herein, a highly miniaturized platform is explored for the control of emission based on individual subwavelength Si nanospheres (SiNSs) to modulate the directional excitation and exciton emission of 2D transition metal dichalcogenides (2D TMDs). A modified Mie theory for dipole–sphere hybrid systems is derived to instruct the optimal design for desirable modulation performance. Controllable forward‐to‐backward intensity ratios are experimentally validated in 532 nm laser excitation and 635 nm exciton emission from a monolayer WS 2 . Versatile light emission control is achieved for different emitters and excitation wavelengths, benefiting from the facile size control and isotropic shape of SiNSs. Simultaneous modulation of excitation and emission via a single SiNS at visible wavelengths significantly improves the efficiency and directionality of TMD exciton emission and leads to the potential of multifunctional integrated photonics. Overall, the work opens promising opportunities for nanophotonics and polaritonic systems, enabling efficient manipulation, enhancement, and reconfigurability of light–matter interactions.