Control of Two-Dimensional Excitonic Light Emission via Photonic Crystal
Abstract
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 greatly enhanced (~60 times) photoluminescence of WSe2 and an effectively coupled cavity-mode emission, we are able 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.
Keywords
Cite
@article{arxiv.1311.6071,
title = {Control of Two-Dimensional Excitonic Light Emission via Photonic Crystal},
author = {Sanfeng Wu and Sonia Buckley and Aaron M. Jones and Jason S. Ross and Nirmal J. Ghimire and Jiaqiang Yan and David G. Mandrus and Wang Yao and Fariba Hatami and Jelena Vučković and Arka Majumdar and Xiaodong Xu},
journal= {arXiv preprint arXiv:1311.6071},
year = {2014}
}
Comments
21 pages, including main manuscript + supplementary materials