THz-photonics transceivers by all-dielectric phonon-polariton nonlinear nanoantennas

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 ω1), the information signal in the optical domain (at ω2) is converted to the THz band (at ω3= ω2- ω1). 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

Data for "Resonant Fully dielectric metasurfaces for ultrafast Terahertz pulse generation"

Dataset to accompany the paper"Resonant Fully dielectric metasurfaces for ultrafast Terahertz pulse generation."The dataset is provided in a .mat format,. Separated into folders for each metasurface denoted in the paper. Then each file is labelled by by input wavelength of the laser. Each metasurface also has a power folder as measured by the opo. Each file is broken into two sets, the reading of the lock-in amplifier and the time axis.Inside the theoretical modelling folder is the .mat data for the theoretical modelling, separated by metasurface and then inside the file separated by energy, thz frequency and wavelength.</p

Resonant Fully dielectric metasurfaces for ultrafast Terahertz pulse generation

Metasurfaces represent a new frontier in materials science paving for unprecedented methods of controlling electromagnetic waves, with a range of applications spanning from sensing to imaging and communications. For pulsed terahertz generation, metasurfaces offer a gateway to tuneable thin emitters that can be utilised for large-area imaging, microscopy and spectroscopy. In literature THz-emitting metasurfaces generally exhibit high absorption, being based either on metals or on semiconductors excited in highly resonant regimes. Here we propose the use of a fully dielectric semiconductor exploiting morphology-mediated resonances and inherent quadratic nonlinear response. Our system exhibits a remarkable 40-fold efficiency enhancement compared to the unpatterned at the peak of the optimised wavelength range, demonstrating its potential as scalable emitter design