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- Title
Compact terahertz harmonic generation in the Reststrahlenband using a graphene-embedded metallic split ring resonator array.
- Authors
Di Gaspare, Alessandra; Song, Chao; Schiattarella, Chiara; Li, Lianhe H.; Salih, Mohammed; Giles Davies, A.; Linfield, Edmund H.; Zhang, Jincan; Balci, Osman; Ferrari, Andrea C.; Dhillon, Sukhdeep; Vitiello, Miriam S.
- Abstract
Harmonic generation is a result of a strong non-linear interaction between light and matter. It is a key technology for optics, as it allows the conversion of optical signals to higher frequencies. Owing to its intrinsically large and electrically tunable non-linear optical response, graphene has been used for high harmonic generation but, until now, only at frequencies < 2 THz, and with high-power ultrafast table-top lasers or accelerator-based structures. Here, we demonstrate third harmonic generation at 9.63 THz by optically pumping single-layer graphene, coupled to a circular split ring resonator (CSRR) array, with a 3.21 THz frequency quantum cascade laser (QCL). Combined with the high graphene nonlinearity, the mode confinement provided by the optically-pumped CSRR enhances the pump power density as well as that at the third harmonic, permitting harmonic generation. This approach enables potential access to a frequency range (6-12 THz) where compact sources remain difficult to obtain, owing to the Reststrahlenband of typical III-V semiconductors.Compact sources in the frequency range of 6-12 THz are difficult to obtain due to optical phonon absorption in conventional III-V semiconductors. Here, the authors demonstrate third harmonic generation at 9.63 THz by optically pumping monolayer graphene coupled to a circular split ring resonator by using a semiconductor laser.
- Publication
Nature Communications, 2024, p1
- ISSN
2041-1723
- Publication type
Article
- DOI
10.1038/s41467-024-45267-2