Milliwatt terahertz harmonic generation from topological insulator metamaterials

Achieving efficient, high-power harmonic generation in the terahertz spectral domain has technological applications, for example, in sixth generation (6G) communication networks. Massless Dirac fermions possess extremely large terahertz nonlinear susceptibilities and harmonic conversion efficiencies...

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Detalles Bibliográficos
Autores: Tielrooij, Klaas-Jan|||0000-0002-0055-6231, Principi, Alessandro|||0000-0002-4776-6965, Saleta Reig, David|||0000-0003-3189-2331, Block, Alexander|||0000-0001-9288-5405, Varghese, Sebin|||0000-0001-7204-7121, Schreyeck, Steffen, Brunner, Karl, Karczewski, Grzegorz, Ilyakov, Igor|||0000-0002-5928-7996, Ponomaryov, Oleksiy, de Oliveira, Thales V. A. G.|||0000-0002-4886-0654, Chen, Min|||0000-0001-5230-360X, Deinert, Jan-Christoph|||0000-0001-6211-0158, Gómez Carbonell, Carmen, Valenzuela, Sergio O.|||0000-0002-4632-8891, Molenkamp, Laurens W., Kiessling, Tobias, Astakhov, Georgy V.|||0000-0003-1807-3534, Kovalev, Sergey|||0000-0002-2290-1016
Tipo de recurso: artículo
Fecha de publicación:2022
País:España
Institución:Universitat Autònoma de Barcelona
Repositorio:Dipòsit Digital de Documents de la UAB
Idioma:inglés
OAI Identifier:oai:ddd.uab.cat:268218
Acceso en línea:https://ddd.uab.cat/record/268218
https://dx.doi.org/urn:doi:10.1038/s41377-022-01008-y
Access Level:acceso abierto
Palabra clave:Nonlinear optics
Metamaterials
High-harmonic generation
Terahertz optics
Descripción
Sumario:Achieving efficient, high-power harmonic generation in the terahertz spectral domain has technological applications, for example, in sixth generation (6G) communication networks. Massless Dirac fermions possess extremely large terahertz nonlinear susceptibilities and harmonic conversion efficiencies. However, the observed maximum generated harmonic power is limited, because of saturation effects at increasing incident powers, as shown recently for graphene. Here, we demonstrate room-temperature terahertz harmonic generation in a BiSe topological insulator and topological-insulator-grating metamaterial structures with surface-selective terahertz field enhancement. We obtain a third-harmonic power approaching the milliwatt range for an incident power of 75 mW-an improvement by two orders of magnitude compared to a benchmarked graphene sample. We establish a framework in which this exceptional performance is the result of thermodynamic harmonic generation by the massless topological surface states, benefiting from ultrafast dissipation of electronic heat via surface-bulk Coulomb interactions. These results are an important step towards on-chip terahertz (opto)electronic applications. Topological insulator metamaterials bring nonlinear terahertz photonic technology a step closer by producing a third-harmonic output power close to a milliwatt.

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