† Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
‡ Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States
Nano Lett., 2013, 13 (6), pp 2884–2888
DOI: 10.1021/nl401219v
Publication Date (Web): May 21, 2013
Copyright © 2013 American Chemical Society
*E-mail: jlevy@pitt.edu.
Terahertz
(0.1–30 THz) radiation reveals a wealth of information that is relevant for
material, biological, and medical sciences with applications that span chemical
sensing, high-speed electronics, and coherent control of semiconductor quantum
bits. To date, there have been no methods capable of controlling terahertz (THz)
radiation at molecular scales. Here we report both generation and detection of
broadband terahertz field from 10 nm scale oxide nanojunctions. Frequency
components of ultrafast optical radiation are mixed at these nanojunctions,
producing broadband THz emission. These same devices detect THz electric fields
with comparable spatial resolution. This unprecedented control, on a scale of 4
orders of magnitude smaller than the diffraction limit, creates a pathway toward
THz-bandwidth spectroscopy and control of individual nanoparticles and
molecules
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