  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, we explore a highly miniaturized platform
for the control of emission based on individual subwavelength Si nanospheres
(SiNSs) to modulate the directional excitation and exciton emission of
two-dimensional 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 WS2. Versatile light emission control
along all device orientations 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 directivity of
TMD exciton emission and leads to the potential of multifunctional integrated
photonics. Overall, our work opens promising opportunities for nanophotonics
and polaritonic systems, enabling efficient manipulation, enhancement and
reconfigurability of light-matter interactions.
