期刊
2D MATERIALS
卷 1, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2053-1583/1/1/011001
关键词
transition metal dichalcogenides; 2D semiconductor; photonic crystal; excitonic light emission; optical antenna
资金
- DoE, BES, Materials Science and Engineering Division [DE-SC0008145]
- National Science Foundation [ECS-9731293]
- Stanford Nano Center
- Stanford Graduate Fellowship
- Presidential Early Award for Scientists and Engineers (PECASE) [N00014-08-1-0561]
- US DoE, BES, Materials Sciences and Engineering Division
- U.S. Department of Energy (DOE) [DE-SC0008145] Funding Source: U.S. Department of Energy (DOE)
Monolayers of transition metal dichalcogenides (TMDCs) have emerged as new optoelectronic materials in the two dimensional (2D) limit, exhibiting rich spin-valley interplays, tunable excitonic effects, and strong light-matter interactions. An essential yet undeveloped ingredient for many photonic applications is the manipulation of its light emission. Here we demonstrate the control of excitonic light emission from monolayer tungsten diselenide (WSe2) in an integrated photonic structure, achieved by transferring one monolayer onto a photonic crystal (PhC) with a cavity. In addition to the observation of an effectively coupled cavity-mode emission, the suspension effects on PhC not only result in a greatly enhanced (similar to 60 times) photoluminescence but also strongly pattern the emission in the subwavelength spatial scale, contrasting on and off the holes. Such an effect leads to a significant diffraction grating effect, which allows us to redistribute the emitted photons both polarly and azimuthally in the far field through designing PhC structures, as revealed by momentum-resolved microscopy. A 2D optical antenna is thus constructed. Our work suggests a new way of manipulating photons in hybrid 2D photonics, important for future energy efficient optoelectronics and 2D nano-lasers.
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