Bulletin of the American Physical Society
APS March Meeting 2023
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session G40: Active Metamaterials
11:30 AM–2:18 PM,
Tuesday, March 7, 2023
Room: Room 232
Sponsoring
Unit:
DMP
Chair: Lan Yang, Washington University, St. Louis
Abstract: G40.00003 : Intensity, wavelength and polarization control of valley excitonic emissions in monolayer MoS2 by dielectric metasurfaces*
12:18 PM–12:30 PM
Presenter:
Sze Cheung Lau
(Stanford University)
Authors:
Sze Cheung Lau
(Stanford University)
Yin Liu
(Stanford University)
Wen-Hui Sophia Cheng
(Stanford University)
Amalya C Johnson
(Stanford University)
Qitong Li
(Stanford University)
Emma Simmerman
(Stanford University)
Ouri Karni
(Stanford University)
Jack Hu
(Stanford University)
Yongmin Liu
(Northeastern University)
Fang Liu
(Stanford University)
Mark L Brongersma
(Stanford University)
Jennifer Dionne
(Stanford University)
Tony F Heinz
(SLAC National Accelerator Laboratory)
freedom that can be optically accessed with circularly polarized light. Here, we demonstrate intensity,
wavelength and polarization control of valley excitonic emission in monolayer MoS 2 by coupling MoS 2
with dielectric metasurfaces composed of arrays of silicon nano-disks. By varying the disk diameter, we
are able to tune the frequencies of Mie scattering modes of the disks to match the exciton frequency in
MoS 2 . The photoluminescence (PL) intensity of MoS 2 can be enhanced by more than 30x on the
metasurface compared with the response for the monolayer on a flat substrate as a consequence of
both excitation and emission enhancement by the metasurface modes. The spectral distribution of the
MoS 2 emission can be markedly modified by the coupling of neutral excitons, trions, and defect bound
excitonic states with the resonance of the metasurfaces. The measured degree of circular polarization of
PL emission exhibits a clear dependence on the metasurface modes because of the Purcell effect, which
is also substantiated by PL lifetime measurements. We will discuss the experimental results and how
they can be understood in terms of electromagnetic simulations of the metasurface response.
*
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