Publications

Enhanced third harmonic generation from the epsilon-near-zero modes of ultrathin films

Luk, Ting S.; De Ceglia, Domenico; Liu, Sheng L.; Keeler, Gordon A.; Prasankumar, Rohit P.; Vincenti, Maria A.; Scalora, Michael; Sinclair, Michael B.; Campione, Salvatore

We experimentally demonstrate efficient third harmonic generation from an indium tin oxide nanofilm (λ/42 thick) on a glass substrate for a pump wavelength of 1.4 μm. A conversion efficiency of 3.3 × 10-6 is achieved by exploiting the field enhancement properties of the epsilon-near-zero mode with an enhancement factor of 200. This nanoscale frequency conversion method is applicable to other plasmonic materials and reststrahlen materials in proximity of the longitudinal optical phonon frequencies.