Journal
NANO LETTERS
Volume 12, Issue 11, Pages 5626-5631Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl302746n
Keywords
Graphene; photonic crystal cavity; optoelectronics; Raman spectroscopy
Categories
Funding
- Air Force Office of Scientific Research PECASE
- DARPA Information in a Photon program [W911NF-10-1-0416]
- National Science Foundation [DMR-1106225]
- U.S. Department of Energy, Office of Basic Energy Sciences [DE-AC02-98CH10886]
- Center for Re-Defining Photovoltaic Efficiency Through Molecule Scale Control, an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001085]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1106225] Funding Source: National Science Foundation
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We demonstrate a large enhancement in the interaction of light with graphene through coupling with localized modes in a photonic crystal nanocavity. Spectroscopic studies show that a single atomic layer of graphene reduces the cavity reflection by more than a factor of one hundred, while also sharply reducing the cavity quality factor. The strong interaction allows for cavity-enhanced Raman spectroscopy on subwavelength regions of a graphene sample. A coupled mode theory model matches experimental observations and indicates significantly increased light absorption in the graphene layer. The coupled graphene cavity system also enables precise measurements of graphene's complex refractive index.
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