High-Harmonic Generation Enhancement with Graphene Heterostructures

被引：11

作者：

Calafell, Irati Alonso ^{[1
]}

Rozema, Lee A. ^{[1
]}

Trenti, Alessandro ^{[1
,2
]}

Bohn, Justus ^{[3
]}

Dias, Eduardo J. C. ^{[4
]}

Jenke, Philipp K. ^{[1
]}

Menghrajani, Kishan S. ^{[3
]}

Iranzo, David Alcaraz ^{[4
]}

de Abajo, F. Javier Garcia ^{[4
,5
]}

Koppens, Frank H. L. ^{[4
,5
]}

Hendry, Euan ^{[3
]}

Walther, Philip ^{[1
,6
,7
]}

机构：

[1] Univ Vienna, Fac Phys, Vienna Ctr Quantum Sci & Technol VCQ, A-1090 Vienna, Austria

[2] AIT Austrian Inst Technol, Ctr Digital Safety & Secur, Vienna, Austria

[3] Univ Exeter, Dept Phys & Astron, Exeter EX4 4QL, Devon, England

[4] Barcelona Inst Sci & Technol, ICFO Inst Ciencies Foton, Barcelona 08860, Spain

[5] ICREA Inst Catalana Recerca & Estudis Avancats, Passeig Luis Companys 23, Barcelona 08010, Spain

[6] Univ Vienna, Christian Doppler Lab Photon Quantum Comp, Fac Phys, A-1090 Vienna, Austria

[7] Univ Vienna, Res Platform Testing Quantum & Grav Interface TUR, A-1090 Vienna, Austria

来源：

ADVANCED OPTICAL MATERIALS | 2022年 / 10卷 / 19期

基金：

欧洲研究理事会; 奥地利科学基金会; 英国工程与自然科学研究理事会;

关键词：

graphene; high-harmonic generation; nonlinear optics; optical nanostructures; PLASMONICS; RADIATION; PLATFORM; NITRIDE;

D O I：

10.1002/adom.202200715

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High-harmonic generation (HHG) in graphene heterostructures, consisting of metallic nanoribbons separated from a graphene sheet by either a few-nanometer layer of aluminum oxide or an atomic monolayer of hexagonal boron nitride, is investigated. The nanoribbons amplify the near-field at the graphene layer relative to the externally applied pumping, thus allowing the observation of third- and fifth-harmonic generation in the carbon monolayer at modest pump powers in the mid-infrared. The dependence of the nonlinear signals on the ribbon width and spacer thickness, as well as pump power and polarization are studied, and enhancement factors (EF) relative to bare graphene reaching 1600 and 4100 for third- and fifth-harmonic generation, respectively, are demonstrated. The work supports the use of graphene heterostructures to selectively enhance specific nonlinear processes of interest, an essential capability for the design of nanoscale nonlinear devices.

引用

页数：9

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