Journal
NANO LETTERS
Volume 13, Issue 12, Pages 5771-5776Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403366d
Keywords
Optical diode; graphene; nonlinear absorption; nonreciprocity
Categories
Funding
- UGC, Government of India
- National Science Foundation, Division of Civil, Mechanical and Manufacturing Innovation (CMMI) [1246800]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1246800] Funding Source: National Science Foundation
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Nanostructured carbons are posited to offer an alternative to silicon and lead to further miniaturization of photonic and electronic devices. Here, we report the experimental realization of the first all-carbon solid-state optical diode that is based on axially asymmetric nonlinear absorption in a thin saturable absorber (graphene) and a thin reverse saturable absorber (C-60 arranged in tandem. This all-optical diode action is polarization independent and has no phase-matching constraints. The nonreciprocity factor of the device can be tuned by varying the number of graphene layers and the concentration or thickness of the C60 coating. This ultracompact graphene/C-60 based optical diode is versatile with an inherently large bandwidth, chemical and thermal stability, and is poised for cost-effective large-scale integration with existing fabrication technologies.
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