title: Broadband terahertz generation and detection at 10 nm scale.
abstract: 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.
authors.affiliation: Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.
authors.forename: Yanjun
authors.initials: Y
authors.lastname: Ma
authors.forename: Mengchen
authors.initials: M
authors.lastname: Huang
authors.forename: Sangwoo
authors.initials: S
authors.lastname: Ryu
authors.forename: Chung Wung
authors.initials: CW
authors.lastname: Bark
authors.forename: Chang-Beom
authors.initials: CB
authors.lastname: Eom
authors.forename: Patrick
authors.initials: P
authors.lastname: Irvin
authors.forename: Jeremy
authors.initials: J
authors.lastname: Levy