Articolo in rivista, 2022, ENG, 10.1109/IRMMW-THz50927.2022.9895811

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 A. A.; Riccardi, Elisa; Sarfraz, Syed M. A.; Scamarcio, G.; Vitiello, Miriam S.

Nest, CNR-Istituto Nanoscienze, Scuola Normale Superiore, Pisa, 56127, Italy; Università Degli Studi di Bari, CNR-IFN, Dipartimento Interateneo di Fisica, Bari, I-70126, Italy

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

International Conference on Infrared, Millimeter, and Terahertz Waves (Print)

Keywords

Frequency modulation, Graphene, Optical saturation, Optical variables control, Optical coupling, Mirrors, Optical modulation

CNR authors

Vitiello Miriam Serena, Di Gaspare Alessandra, Riccardi Elisa

CNR institutes

NANO – Istituto Nanoscienze