Journal
ACS PHOTONICS
Volume 6, Issue 11, Pages 2841-2849Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b00928
Keywords
graphene; hot electrons; third-harmonic generation; photonics; optoelectronics; nonlinear optics; ultrafast optics
Categories
Funding
- EU
- EPSRC [EP/K01711X/1, EP/K017144/1, EP/N010345/1, EP/L016087/1]
- Swedish Research Council [VR 2018-04252]
- ERC
- EPSRC [EP/K01711X/1, EP/K017144/1, EP/N010345/1] Funding Source: UKRI
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Hot electrons dominate the ultrafast (similar to fs-ps) optical and electronic properties of metals and semiconductors, and they are exploited in a variety of applications including photovoltaics and photodetection. We perform power-dependent third-harmonic generation measurements on gated single-layer graphene and detect a significant deviation from the cubic power law expected for a third-harmonic generation process. We assign this to the presence of hot electrons. Our results indicate that the performance of nonlinear photonics devices based on graphene, such as optical modulators and frequency converters, can be affected by changes in the electronic temperature, which might occur due to an increase in absorbed optical power or Joule heating.
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