Journal
NANO LETTERS
Volume 16, Issue 8, Pages 4940-4945Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01558
Keywords
Hyperbolic metamaterials; plasmonics; photonic hyper crystal; purcell enhancement; 2D materials; transition metal dichalcogenides
Categories
Funding
- NSF [ECCS - 1509551]
- Army Research Office (ARO) [W911NF15-1-0019]
- Gordon and Betty Moore Foundation
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Ministry of Science and Technology [MOST 105-2112-M-007-032-MY3, MOST 104-2633-M-007-001]
- Academia Sinica Research Program on Nanoscience and Nanotechnology, Taiwan
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1509551] Funding Source: National Science Foundation
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The low quantum yield observed in two-dimensional semiconductors of transition metal dichalcogenides (TMDs) has motivated the quest for approaches that can enhance the light emission from these systems. Here, we demonstrate broadband enhancement of spontaneous emission and increase in Raman signature from archetype two-dimensional semiconductors: molybdenum disulfide (MoS2) and tungsten disulfide (WS2) by placing the monolayers in the near field of a photonic hypercrystal having hyperbolic dispersion. Hypercrystals are characterized by a large broadband photonic density of states due to hyperbolic dispersion while having enhanced light in/out coupling by a subwavelength photonic crystal lattice. This dual advantage is exploited here to enhance the light emission from the 2D TMDs and can be utilized for developing light emitters and solar cells using two-dimensional semiconductors.
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