Monolithic compact terahertz emitter and detector

In this work, we present our recent development of a new ultra-compact terahertz (THz) transceiver aimed at performing reflective near-field THz time-domain spectroscopy. This emitter/receiver is composed of a trilayer spintronic material deposited directly on a thin LiNbO
3
(LN) electro-optic (EO) crystal. Our results demonstrate the generation and detection of a THz pulse by the thin LN crystal with, respectively, a pump beam at $1,040 {\mu} \mathrm{m}$ and a probe beam at 800 nm detected in the near field. We also compare the detection performance of the LN crystal for a signal from a spintronic emitter and that of a 1 mm thick cadmium telluride (CdTe) crystal.