Plasmonics-enhanced photoconductive terahertz detector pumped by Ytterbium-doped fiber laser
Abstract
We present a photoconductive terahertz detector operating at the 1 µm wavelength range at which high-power and compact Ytterbium-doped femtosecond fiber lasers are available. The detector utilizes an array of plasmonic nanoantennas to provide sub-picosecond transit time for the majority of photo-generated carriers to enable high-sensitivity terahertz detection without using a short-carrier-lifetime substrate. By using a high-mobility semiconductor substrate and preventing photocarrier recombination, the presented detector offers significantly higher sensitivity levels compared with previously demonstrated broadband photoconductive terahertz detectors operating at the 1 µm wavelength range. We demonstrate pulsed terahertz detection over a 4 THz bandwidth with a record-high signal-to-noise ratio of 95 dB at an average terahertz radiation power of 6.8 µW, when using an optical pump power of 30 mW.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 27, 2020
- Source ID
- 10.1364/oe.386368
Entities
People
- Deniz Turan
- Mona Jarrahi
- Nezih Tolga Yardimci
Organizations
- Gordon and Betty Moore Foundation
- Office of Naval Research
- United States Department of Energy