Abstract-Materials for 1.55μm-pumped terahertz photoconductive switches: a review

Yuejing Wang; Charles Jabbour; Joshua M. O. Zide;

https://www.spiedigitallibrary.org/conference-proceedings-of-spie/10383/103830N/Materials-for-155mum-pumped-terahertz-photoconductive-switches-a-review/10.1117/12.2273912.short


This paper reviews promising materials for compact sources and detectors for terahertz pulses via 1.55 μm photoconductive switches. We begin with a brief description of importance of effective terahertz generation and detection, then the mechanism of photoconductive switches will be introduced. Then, we provide a detailed discussion and comparison on a wide range of the state-of-the-art materials and their relevant properties for terahertz photoconductive switches including bandgap energy, dark resistance, carrier mobility, carrier lifetime, and etc.

© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.

Abstract-Plasmon-enhanced below bandgap photoconductive terahertz generation and detection.

Jooshesh A, Bahrami-Yekta V, Zhang J, Tiedje T, Darcie T, Gordon R.

http://www.ncbi.nlm.nih.gov/pubmed/26575274

We use plasmon enhancement to achieve terahertz (THz) photoconductive switches that combine the benefits of low-temperature grown GaAs with mature 1.5 micron femtosecond lasers operating below the bandgap. These below bandgap plasmon-enhanced photoconductive receivers and sources significantly outperform commercial devices based on InGaAs, both in terms of bandwidth and power, even though they operate well below saturation. This paves the way for high-performance low-cost portable systems to enable emerging THz applications in spectroscopy, security, medical imaging and communication.

US Patent Issued to Emcore on Dec. 10 for "Terahertz frequency domain spectrometer with frequency shifting of source laser beam" (California Inventors)

ALEXANDRIA, Va., Dec. 10 -- United States Patent no. 8,604,433, issued on Dec. 10, was assigned to Emcore Corp. (Albuquerque, N.M.).

http://www.laserfocusworld.com/news/2013/12/11/us-patent-issued-to-emcore-on-dec-10-for-terahertz-frequency-domain-spectrometer-with-frequency-shif.html

"Terahertz frequency domain spectrometer with frequency shifting of source laser beam" was invented by Ronald T. Logan Jr. (Pasadena, Calif.) and Joseph R. Demers (North Hollywood, Calif.). According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus for analyzing, identifying or imaging an target including first and second laser beams coupled to a pair of photoconductive switches to produce CW signals in one or more bands in a range of frequencies greater than 100 GHz focused on and transmitted through or reflected from the target; and a detector for acquiring spectral information from signals received from the target and using a multi-spectral heterodyne process to generate an electrical signal representative of some characteristics of the target. The lasers are tuned to different frequencies and a frequency shifter in the path of one laser beam allows the terahertz beam to be finely adjusted in one or more selected frequency bands." The patent was filed on Aug. 23, 2010, under Application No. 12/861,651. *For further information, including images, charts and tables, please visit:

http://patft.uspto.gov/netacgi/nph-Parser?