  Terahertz (THz) technology is promising in several applications such as
imaging, spectroscopy and communications. Among several methods in the
generation and detection of THz waves, a THz time domain system (TDS) that is
developed using photoconductive antennas (PCA) as emitter and detector presents
several advantages such as simple alignment, low cost, high performance etc. In
this work, we report the design, fabrication and characterization of a 2-D PCA
array that is capable of detecting both the amplitude and phase of the THz
pulse. The PCA array is fabricated using LT-GaAs and has 8 channels with 64
pixels (8x8). The infrared probe beam is steered and focused towards each pixel
of the PCA array using a spatial light modulator (SLM). The measured
photocurrent (amplitude and phase) from each channel is recorded separately and
the frequencies up to 1.4 THz can be detected. Furthermore, the parameters such
as directional time delay of the THz pulse, crosstalk between the channels
etc., were characterized. Finally, we show that the proposed 2D PCA array
design is flexible and can be used for accelerated THz spectral image
acquisition.
