- Room-temperature nanowire terahertz photodetectors doi link

Auteur(s): Romeo Lorenzo, Coquillat D., Viti Leonardo, Ercolani Daniele, Sorba Lucia, Knap W., Tredicucci Alessandro, Vitiello Miriam

Conference: Quantum Sensing and Nanophotonic Devices X (, US, 2013-02-02)
Actes de conférence: Proceedings SPIE, 8631, Quantum Sensing and Nanophotonic Devices X, vol. 8631 p.86312E (2013)

Ref HAL: hal-00816617_v1
DOI: 10.1117/12.2004193
WoS: 000319759100054
Exporter : BibTex | endNote

Semiconductor nanowires (NWs) represent an ideal building block for implementing rectifying diodes or plasma­ wave detectors that could operate well into the THz, thanks to the typical attofarad-order capacitance. Despite the strong effort in developing these nanostructures for a new generation of complementary metal-oxide semi­ conductors (CMOS), memory and photonic devices, their potential as radiation sensors into the Terahertz is just starting to be explored. We report on the development of NW-based field effect transistors operating as high sensitivity THz detectors in the 0.3 - 2.8 THz range. By feeding the radiation field of either an electronic THz source or a quantum cascade laser (QCL) at the gate-source electrodes by means of a wide band dipole antenna, we measured a photovoltage signal corresponding to responsivity values up to 100 V IW, with impressive noise equivalent power levels < 6 x 10-11W/Hz at room temperature and a > 300kHz modulation bandwidth. The potential scalability to even higher frequencies and the technological feasibility of realizing multi-pixel arrays coupled with QCL sources make the proposed technology highly competitive for a future generation of THz detection systems.