Room-temperature nanowire terahertz photodetectors

Lorenzo Romeo; Dominique Coquillant; Leonardo Viti; Daniele Ercolani; Lucia Sorba; Wojciech Knap; Alessandro Tredicucci; Miriam Serena Vitiello

doi:10.1117/12.2004193

4 February 2013 Room-temperature nanowire terahertz photodetectors

Lorenzo Romeo, Dominique Coquillant, Leonardo Viti, Daniele Ercolani, Lucia Sorba, Wojciech Knap , Alessandro Tredicucci, Miriam Serena Vitiello

Author Affiliations +

Proceedings Volume 8631, Quantum Sensing and Nanophotonic Devices X; 86312E (2013) https://doi.org/10.1117/12.2004193
Event: SPIE OPTO, 2013, San Francisco, California, United States

Abstract

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.

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Lorenzo Romeo, Dominique Coquillant, Leonardo Viti, Daniele Ercolani, Lucia Sorba, Wojciech Knap , Alessandro Tredicucci, and Miriam Serena Vitiello "Room-temperature nanowire terahertz photodetectors", Proc. SPIE 8631, Quantum Sensing and Nanophotonic Devices X, 86312E (4 February 2013); https://doi.org/10.1117/12.2004193

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