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Enhanced Optical Second-Harmonic Generation from the Current-Biased Graphene/SiO2/Si(001) Structure
- Source :
- Nano Letters. 13:2104-2109
- Publication Year :
- 2013
- Publisher :
- American Chemical Society (ACS), 2013.
-
Abstract
- We find that optical second-harmonic generation (SHG) in reflection from a chemical-vapor-deposition graphene monolayer transferred onto a SiO2/Si(001) substrate is enhanced about 3 times by the flow of direct current electric current in graphene. Measurements of rotational-anisotropy SHG revealed that the current-induced SHG from the current-biased graphene/SiO2/Si(001) structure undergoes a phase inversion as the measurement location on graphene is shifted laterally along the current flow direction. The enhancement is due to current-associated charge trapping at the graphene/SiO2 interface, which introduces a vertical electric field across the SiO2/Si interface that produces electric field-induced SHG. The phase inversion is due to the positive-to-negative polarity switch in the current direction of the trapped charges at the current-biased graphene/SiO2 interface.
- Subjects :
- Materials science
business.industry
Graphene
Mechanical Engineering
Direct current
Second-harmonic imaging microscopy
Second-harmonic generation
Bioengineering
General Chemistry
Substrate (electronics)
Condensed Matter Physics
law.invention
law
Electric field
Optoelectronics
General Materials Science
Electric current
business
Graphene nanoribbons
Subjects
Details
- ISSN :
- 15306992 and 15306984
- Volume :
- 13
- Database :
- OpenAIRE
- Journal :
- Nano Letters
- Accession number :
- edsair.doi.dedup.....da1ad3e806fc1b3e22dada3718f8e8d8