Journal
LIGHT-SCIENCE & APPLICATIONS
Volume 5, Issue -, Pages -Publisher
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2016.52
Keywords
angle-selective perfect absorption; angle-selective thin optical element; graphene; mid-infrared; two-dimensional materials
Categories
Funding
- National Science Foundation through the National Nanotechnology Infrastructure Network (NNIN) [ECS-9731293]
- Stanford Nano Center (SNC)
- AFOSR MURI [FA9550-12-1-0024]
- National Key Basic Research Program of China [2013CBA01604, 2015CB921600]
- National Natural Science Foundation of China [61325020, 61261160499, 11274154]
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1405201] Funding Source: National Science Foundation
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Two-dimensional (2D) materials have great potential in photonic and optoelectronic devices. However, the relatively weak light absorption in 2D materials hinders their application in practical devices. Here, we propose a general approach to achieve angle-selective perfect light absorption in 2D materials. As a demonstration of the concept, we experimentally show giant light absorption by placing large-area single-layer graphene on a structure consisting of a chalcogenide layer atop a mirror and achieving a total absorption of 77.6% in the mid-infrared wavelength range (similar to 13 mu m), where the graphene contributes a record-high 47.2% absorptivity of mid-infrared light. Construction of such an angle-selective thin optical element is important for solar and thermal energy harvesting, photo-detection and sensing applications. Our study points to a new opportunity to combine 2D materials with photonic structures to enable novel device applications.
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