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Electric-field induced SHG (EFISHG) in graphene

Woeste, Jonas and Stojanovic, Nikola and Gensch, Michael (2023) Electric-field induced SHG (EFISHG) in graphene. In: Electric-field induced SHG (EFISHG) in graphene. PHOTONICA2023 : 9th International School and Conference on Photonics, 2023-08-28 - 2023-09-01, Belgrade, Serbia.

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High harmonics generation (HHG) is a process which gives a direct insight into nonlinear properties of matter. Modern quantum materials like graphene or topological insulators attract considerable interest from scientific communities interested in the fundamental understanding of the often-exotic light-matter interactions as well as in the search for new technological applications. We mastered to study the nonlinear THz properties of such materials by means of THz emission spectroscopy e.g. single layer graphene [1]. The developed experimental set-ups allow one to determine the incident and re-emitted THz fields quantitatively with unique sensitivity levels. The results obtained for monolayer graphene can be explained by a simple thermodynamic model [1,2] and open up the technological possibility for purely electronic THz frequency synthesis within the present generation of graphene transistors operating at fundamental frequencies of a few hundred gigahertz. Recently our collaboration successfully showed that (i) the nonlinearity of graphene can be controlled over two orders of magnitude by applying moderate gate voltages in the sub-Volt regime [3] and (ii) that a specifically designed grating-graphene meta-material enables further increase in the THz nonlinearity via plasmonic field enhancement [4]. In these previous works, we have focused on studying nonlinearities of odd-order, since monolayer graphene is a centrosymmetric material, where even-order susceptibilities cancel out. As a next step we plan to investigate if an effective 2nd order nonlinearity can be efficiently generated by applying appropriate in-plane DC electric fields, thus breaking the inversion symmetry, such as what has recently been demonstrated and observed in GaAs [5]. Preparations for this experiment and its feasibility are discussed

Item URL in elib:https://elib.dlr.de/202751/
Document Type:Conference or Workshop Item (Poster)
Title:Electric-field induced SHG (EFISHG) in graphene
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Gensch, MichaelUNSPECIFIEDhttps://orcid.org/0000-0001-7755-1618153593097
Date:September 2023
Journal or Publication Title:Electric-field induced SHG (EFISHG) in graphene
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Keywords:Graphene, Second Harmonic
Event Title:PHOTONICA2023 : 9th International School and Conference on Photonics
Event Location:Belgrade, Serbia
Event Type:international Conference
Event Start Date:28 August 2023
Event End Date:1 September 2023
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Robotics
DLR - Research area:Raumfahrt
DLR - Program:R RO - Robotics
DLR - Research theme (Project):R - spectroscopy methodology
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Optical Sensor Systems > Terahertz and Laser Spectroscopy
Deposited By: Stojanovic, Nikola
Deposited On:20 Feb 2024 11:25
Last Modified:24 Apr 2024 21:02

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