We report an electrolyte-gated single layer graphene super-capacitor, embedded in a polyethylene-on-Au Salisbury mirror optical architecture, working as a THz frequency modulator. The gate-tunable single layer graphene in a quarter wave waveguide ensures 40% optical amplitude modulation depth, and saturable absorption mirror operation, with similar to 4.5 Wcm(-2) saturation intensity. By coupling the modulator with a THz quantum cascade laser frequency comb in an external cavity configuration, we also demonstrate fine-tuning of the intermode beatnote frequency, revealing a promising perspective for metrological sources requiring a tight frequency control of the intermode comb frequency
Multifunctional Ionic-Gated Graphene Salisbury Mirror Supercapacitor, with Saturable Absorption, Amplitude Modulation and Frequency-Tuning Capabilities in the 2-5 THz Range
Di Gaspare, Alessandra;Pogna, Eva;Riccardi, Elisa;Scamarcio, G.;Vitiello, Miriam S.
2022
Abstract
We report an electrolyte-gated single layer graphene super-capacitor, embedded in a polyethylene-on-Au Salisbury mirror optical architecture, working as a THz frequency modulator. The gate-tunable single layer graphene in a quarter wave waveguide ensures 40% optical amplitude modulation depth, and saturable absorption mirror operation, with similar to 4.5 Wcm(-2) saturation intensity. By coupling the modulator with a THz quantum cascade laser frequency comb in an external cavity configuration, we also demonstrate fine-tuning of the intermode beatnote frequency, revealing a promising perspective for metrological sources requiring a tight frequency control of the intermode comb frequencyFile | Dimensione | Formato | |
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