Study of the coupling of terahertz radiation to heterostructure transistors with a free electron laser source

Michele Ortolani, Alessandra Di Gaspare, Ennio Giovine, Florestano Evangelisti, Vittorio Foglietti, Andrea Doria, Gian Piero Gallerano, Emilio Giovenale, Giovanni Messina, Ivan Spassovsky, Claudio Lanzieri, Marco Peroni, Antonio Cetronio

Research output: Contribution to journalArticle

9 Citations (Scopus)


High electron mobility transistors can work as room-temperature direct detectors of radiation at frequency much higher than their cutoff frequency. Here, we present a tool based on a Free Electron Laser source to study the detection mechanism and the coupling of the high frequency signal into the transistor channel. We performed a mapping over a wide area of the coupling of 0.15 THz radiation to an AlGaN/GaN transistors with cut-off frequency of 30 GHz. Local, polarization-dependent irradiation allowed us to selectively couple the signal to the channel either directly or through individual transistor bias lines, in order to study the nonlinear properties of the transistor channel. Our results indicate that HEMT technology can be used to design a millimeter-wave focal plane array with integrated planar antennas and readout electronics. © 2009 Springer Science+Business Media, LLC.
Original languageEnglish
Pages (from-to)1362 - 1373
Number of pages12
JournalJournal of Infrared, Millimeter, and Terahertz Waves
Issue number12
Publication statusPublished - 2009
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Radiation
  • Instrumentation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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