posted on 2023-06-10, 02:55authored byUnai Arregui Leon, Davide Rocco, Luca Carletti, Marco Peccianti, Stefano Maci, Giuseppe Della Valle, Costantino De Angelis
The THz spectrum (spanning from 0.3 to 30 THz) offers the potential of a plethora of applications, ranging from the imaging through non transparent media to wireless-over-fiber communications and THz-photonics. The latter framework would greatly benefit from the development of optical-to-THz wavelength converters. Exploiting Difference Frequency Generation in a nonlinear all dielectric nanoantenna, we propose a compact solution to this problem. By means of a near-infrared pump beam (at ?1), the information signal in the optical domain (at ?2) is converted to the THz band (at ?3=?2-?1). The approach is completely transparent with respect to the modulation format, and can be easily integrated in a metasurface platform for simultaneous frequency and spatial moulding of THz beams.