Numerical study on enhanced absorption of nanospaced MoS2 multilayers via guided-mode resonance

The enhancement of optical absorption in cascaded monolayer MoS2 separated alternately by high-index slab and low-index slab is investigated numerically according to well-known equations. It is found that the large tangential wave vector can result in optical absorption enhancement for p-polarized i...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2017-10, Vol.50 (39)
Main Authors: Shen, Kesheng, Lu, Hai, Zhang, Jun, Xia, Shiqiang, Kang, Xiubao, Dong, Chao, Xiong, Zonggang, Zhang, Xianzhou
Format: Article
Language:English
Subjects:
absorption
resonance
solar energy
Online Access:Get full text
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Summary:The enhancement of optical absorption in cascaded monolayer MoS2 separated alternately by high-index slab and low-index slab is investigated numerically according to well-known equations. It is found that the large tangential wave vector can result in optical absorption enhancement for p-polarized illumination, due to the large field enhancement at the interface of high/low-index mediums, associated with the excitation of guided-wave resonance modes. The optical absorption around the excitonic states of the monolayer MoS2 can be greatly enhanced up to ~50% for such structures without the assistance of any other lossy materials, such as plasmonic materials. And the absorbance will be close to 100% when the optical properties of surrounding is unsymmetrical. This property is particularly beneficial for harvesting light in devices based on atomically thin MoS2 while preserving the innate direct band gap property of monolayer MoS2.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aa8531