Gate-Tunable Optical Nonlinearities and Extinction in Graphene/LaAlO3/SrTiO3 Nanostructures
- Authors
- Sheridan, Erin; Chen, Lu; Li, Jianan; Guo, Qing; Hao, Shan; Yu, Muqing; Eom, Ki-Tae; Lee, Hyungwoo; Lee, Jung-Woo; Eom, Chang-Beom; Irvin, Patrick; Levy, Jeremy
- Issue Date
- Oct-2020
- Publisher
- AMER CHEMICAL SOC
- Keywords
- LAO/STO; graphene; plasmons; terahertz spectroscopy; VIS-NIR
- Citation
- NANO LETTERS, v.20, no.10, pp 6966 - 6973
- Pages
- 8
- Journal Title
- NANO LETTERS
- Volume
- 20
- Number
- 10
- Start Page
- 6966
- End Page
- 6973
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/89541
- DOI
- 10.1021/acs.nanolett.0c01379
- ISSN
- 1530-6984
1530-6992
- Abstract
- We explore the ultrafast optical response of graphene subjected to intense (similar to 10(6) V/cm) local (similar to 10 nm) electric fields. Nanoscale gating of graphene is achieved using a voltage-biased, SrTiO3-based conductive nanowire junction "written" directly under the graphene and isolated from it by an insulating ultrathin (<2 nm) LaAlO3 barrier. Upon illumination with ultrafast visibleto-near-infrared (VIS-NIR) light pulses, the local field from the nanojunction creates a strong gate-tunable second-order nonlinearity in the graphene and produces a substantial difference-frequency (DFG) and sum-frequency generation (SFG) response detected by the nanojunction. Spectrally sharp, gate-tunable extinction features (>99.9%) are observed in the VIS-NIR and SFG spectral ranges, in parameter regimes that are positively correlated with the enhanced nonlinear response. The observed graphene-light interaction and nonlinear response are of fundamental interest and open the way for future exploitation in graphene-based optical devices such as phase shifters, modulators, and nanoscale THz sources.
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