Experimental investigation of wave-packet propagation in terahertz frequency region

Abstract

We demonstrate a measurement system for the experimental investigation of propagation dynamics of terahertz (THz) wave packets using electro-optic (EO) sensing. Wave packets are modeled by the superposition of harmonic continuous-wave frequencies. Amplitude and phase distributions of electromagnetic waves are measured and summed to visualize wave packet propagation dynamics. In a proof-of-concept, visualization of wave packets with the center frequency of 120 GHz was demonstrated and compared with the 3D simulation. The measurements agreed well with the simulated results. The proposed technique can be used to investigate propagation dynamics in the THz region which is useful in THz wireless communication.

Fast prediction of a high directivity antenna characterization for future wireless communication based on terahertz photonics

“…Previously, we investigated high-directivity antenna characterization based on near-field measurements [10,11]. The generation of the THz signal using a self-heterodyne technique and a nonpolarimetric frequency down-conversion technique is depicted in Figure 1 [12,13,14].…”

Electrooptic sensing for antenna characterization and propagation investigation at THz band

“…Electric field measurement using electrooptic (EO) sensor is a promising technique to investigate and characterize the beam quality or radiation pattern of the antenna because of a minimum disturbance to the field to be measured. Recently, we proposed a nonpolarimetric EO frequency down conversion technique [1], self-heterodyne technique [2], noise cancelling technique [3], and photonic frequency tracking technique [4] and demonstrated the near-field visualization at microwave [5], millimeter-wave [6] and THz wave [7,8,9] region. In this paper, we show the two applications of the EO sensing at THz band; near-field measurement and farfield characterization of a Cassegrain antenna at 300 GHz and visualization of a wave packet propagation in a free space at 120 GHz.…”