Open AccessBroadband heterodyne detection of terahertz‐waves using rectangular‐waveguide‐input Fermi‐level managed barrier diode module
Author(s) -
Ito H.,
Ishibashi T.
Publication year - 2019
Publication title -
electronics letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.375
H-Index - 146
eISSN - 1350-911X
pISSN - 0013-5194
DOI - 10.1049/el.2019.1803
Subject(s) - bandwidth (computing) , terahertz radiation , optics , broadband , diode , frequency band , preamplifier , heterodyne detection , local oscillator , optoelectronics , physics , electrical engineering , materials science , telecommunications , engineering , phase noise , laser , amplifier
A zero‐biased Fermi‐level managed barrier diode that was packaged with a WR‐3 rectangular‐waveguide‐input port was developed. For direct (square‐law) detection operations, the fabricated module exhibited a 3 dB bandwidth covering the whole WR‐3 band. The intermediate frequency bandwidth in heterodyne detection was, therefore, dominated by the bandwidth of the integrated preamplifier, and it was measured to be about 40 GHz. The minimum noise‐equivalent power obtained was as low as 7 × 10 −18 W/Hz at around 300 GHz even with a very low local oscillator power of 30 μW.