Control of two-dimensional excitonic light emission via photonic crystal
By Sanfeng Wu, S. Buckley, Aaron M. Jones, J. Ross, N. Ghimire, Jiaqiang Yan, D. Mandrus, W. Yao, F. Hatami, Jelena Vuckovic and 2 more. 2013
164 citations recorded by the source corpus.
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 (∼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.
Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/48902d66782a5dfa97d7fb4104b456799985c3e3
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In Materials Chemistry
Citations in the corpus
- Van der Waals Materials for Atomically-Thin Photovoltaics: Promise and Outlook (2017, unknown): “cavities such as photonic crystals and ring resonators have also been used to enhance absorption, mainly aimed at emission applications in monolayer samples.(38-41)”
- Valley-polarized exciton–polaritons in a monolayer semiconductor (2017, background): “[31] Sanfeng Wu, Sonia Buckley, Aaron M Jones, Jason S Ross, Nirmal J Ghimire, Jiaqiang Yan, David G Man-”