Coherent terahertz metrology
Our TFLN chips showcase the potential of photonic integrated circuits for next-generation 6G communication, remote sensing, and quantum science. For example, most communication protocols exploit phase/amplitude modulation of the carrier waves, at ever-increasing speeds, up to the 100s of Gigahertz. Using the chip illustrated in the sketch below, we demonstrate that this is possible by directly collecting free-space THz waves with frequencies up to 0.4 THz. The optical wave, propagating through the chip, mixes with THz radiation, generating sidebands, which are measured with a spectrometer.
Correlation metrology
Aside from that, we use TFLN chips in THz quantum science. Our platform allows the realization of the on-chip cavities for THz fields. The dynamics of the THz vacuum fields are of great interest for fundamental sciences, and the properties of these fields can be studied by probing them with optical waves. Hence, our devices pave the way for direct probing of the quantum vacuum THz fields intra-cavity.