Open AccessPlasmonics-enhanced photoconductive terahertz detector pumped by Ytterbium-doped fiber laser
Author(s) -
Deniz Turan,
Nezih Tolga Yardimci,
Mona Jarrahi
Publication year - 2020
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.386368
Subject(s) - terahertz radiation , optoelectronics , optics , materials science , laser , photomixing , detector , picosecond , photodetector , femtosecond , photoconductivity , terahertz spectroscopy and technology , far infrared laser , physics , terahertz metamaterials
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.