Polarization-sensitive terahertz detection by multicontact photoconductive receivers

Polarization-sensitive terahertz detection by multicontact photoconductive receivers

A polarization-insensitive plasmonic photoconductive terahertz emitter

We present a polarization-insensitive plasmonic photoconductive terahertz emitter that uses a two-dimensional array of nanoscale cross-shaped apertures as the plasmonic contact electrodes. The geometry of the cross-shaped apertures is set to maximize optical pump absorption in close proximity to the contact electrodes. The two-dimensional symmetry of the cross-shaped apertures offers a polariza...

Ultrabroadband terahertz field detection by proton-bombarded InP photoconductive antennas.

Photoconductive (PC) antennas fabricated on InP bombarded with 180 keV protons of different dosages (InP:H+) all exhibit a useful bandwidth of about 30 THz, comparable to that of the LT-GaAs PC antenna. The peak signal current of the best InP: H+ device (dosage of 10;15 ions/cm;2) is slightly higher than that of the LT-GaAs one, while the signal-to-noise ratio (SNR) of the former is about half ...

Three-Contact Photoconductive Antenna for Polarization Detection of THz Radiation

For polarization measurement of terahertz (THz) electromagnetic radiation we conventionally have been using a set of wire-grid polarizers. In the THz time domain spectroscopy (TDS) measurements, such a method requires twice of the time-delay scans, which is time consuming and can be the origin of the systematic error caused by the intensity fluctuation of laser. In addition, the efficiency of a...

Terahertz Polarization Imaging for Colon Cancer Detection

Continuous wave terahertz (THz) imaging has the potential to offer a safe, noninvasive medical imaging modality for delineating colorectal cancer. The terahertz reflectance measurements of fresh 3 – 5 mm thick human colonic excisions were acquired using a continuous-wave polarization imaging technique. A CO2 optically pumped FarInfrared molecular gas laser operating at 584 GHz was used to illum...