Gate-Tunable Optical Nonlinearities and Extinction in Graphene/LaAlO${}_3$/SrTiO${}_3$ Nanostructures

Abstract

Pristine, undoped graphene has a constant absorption of 2.3 % across the visible to near-infrared (VIS-NIR) region of the electromagnetic spectrum. Under certain conditions, such as nanostructuring and intense gating, graphene can interact more robustly with VIS-NIR light and exhibit a large nonlinear optical response. Here, we explore the optical properties of graphene/LaAlO${}_3$/SrTiO${}_3$ nanostructures, where nanojunctions formed at the LaAlO${}_3$/SrTiO${}_3$ interface enable large (~10${}^8$ V/m) electric fields to be applied to graphene over a scale of ~10 nm. Upon illumination with ultrafast VIS-NIR light, graphene/LaAlO${}_3$/SrTiO${}_3$ nanostructures produce broadband THz emission as well as a sum-frequency generated (SFG) response. Strong spectrally sharp, gate-tunable extinction features (>99.99%) are observed in both the VIS-NIR and SFG regions alongside significant intensification of the nonlinear response. The observed gate-tunable strong graphene-light interaction and nonlinear optical response are of fundamental interest and open the way for future exploitation in graphene-based optical devices.

20 pages, 7 figures, supplementary information included

References in corpus (30)

• Electric Field Effect in Atomically Thin Carbon Films
• Universal Dynamic Conductivity and Quantized Visible Opacity of Suspended Graphene
• Graphene plasmonics
• Ultrafast graphene photodetector
• Plasmonics in graphene at infra-red frequencies
• Graphene Plasmonics: Challenges and Opportunities
• Total light absorption in graphene
• Strong nonlinear optical response of graphene flakes measured by four-wave mixing
• Ultrafast collinear scattering and carrier multiplication in graphene
• Graphene-Based Integrated Photonics For Next-Generation Datacom And Telecom
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Broadband, electrically tuneable, third harmonic generation in graphene
• Gate tunable third-order nonlinear optical response of massless Dirac fermions in graphene
• Electronically Tunable Perfect Absorption in Graphene
• Single-photon nonlinear optics with graphene plasmons
• Extraordinary nonlinear plasmonics in graphene nanoislands
• "Water-cycle" mechanism for writing and erasing nanostructures at the LaAlO3/SrTiO3 interface
• Plasmon-assisted high-harmonic generation in graphene
• Rewritable nanoscale oxide photodetector
• Second harmonic generation in multilayer graphene induced by direct electric current
• Electrically Tunable Optical Nonlinearities in Graphene-Covered SiN Waveguides Characterized by Four-Wave Mixing
• Electrostatically confined monolayer graphene quantum dots with orbital and valley splittings
• Doping Induced Second Harmonic Generation in Centrosymmetric Graphene from Quadrupole Response
• Guided plasmons in graphene p-n junctions
• Plasmon-enhanced nonlinear wave mixing in nanostructured graphene
• Hot electrons modulation of third harmonic generation in graphene
• Mixing of Edge States at a Bipolar Graphene Junction
• Electrical Detection of Single Graphene Plasmons
• Reconfigurable edge-state engineering in graphene using LaAlO${}_3$/SrTiO${}_3$ nanostructures
• Giant intrinsic photoresponse in pristine graphene

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