期刊
JOURNAL OF PHYSICS D-APPLIED PHYSICS
卷 55, 期 22, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1361-6463/ac570e
关键词
microresonators; 2D semiconductors; dark excitons; Purcell factor
资金
- Department of Science and Technology [SB/S2/RJN-110/2017, ECR/2018/001485, DST/NM/NS-2018/49]
In this study, we propose a method to enhance the coupling of dark excitons in two-dimensional materials with resonant modes by manipulating the anisotropy of the Purcell factor. We demonstrate the versatility of tapering the sidewalls of a silica micro-disk to selectively couple whispering gallery modes to light emitted from out-of-plane dipoles, relative to in-plane ones, for four representative monolayer TMDCs.
Tightly bound dark excitons in atomically thin semiconductors can be used for various optoelectronic applications including light storage and quantum communication. Their optical accessibility is however limited due to their out-of-plane transition dipole moment. We thus propose to strengthen the coupling of dark excitons in two dimensional materials with out-of-plane resonant modes of a cavity at room temperature, by engineering the anisotropy in the Purcell factor. A silica micro-disk characterised by high confinement of light in small modal volume, high Q-factor and free spectral range is used to couple to the excitons in monolayer transition metal dichalcogenides (TMDCs). We show numerically that the tapering of sidewalls of the micro-disk is an extremely versatile route for achieving the selective coupling of whispering gallery modes to light emitted from out-of-plane dipoles to the detriment of that from in-plane ones for four representative monolayer TMDCs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据