Over 100-THz bandwidth selective difference frequency generation at LaAlO3/SrTiO3 nanojunctions

Year: 2019

Type: article

Abstract: The ability to combine continuously tunable narrow-band terahertz (THz) generation that can access both the far-infrared and mid-infrared regimes with nanometer-scale spatial resolution is highly promising for identifying underlying light-matter interactions and realizing selective control of rotational or vibrational resonances in nanoparticles or molecules. Here, we report selective difference frequency generation with over 100 THz bandwidth via femtosecond optical pulse shaping. The THz emission is generated at nanoscale junctions at the interface of LaAlO3/SrTiO3 (LAO/STO) that is defined by conductive atomic force microscope lithography, with the potential to perform THz spectroscopy on individual nanoparticles or molecules. Numerical simulation of the time-domain signal facilitates the identification of components that contribute to the THz generation. This ultra-wide-bandwidth tunable nanoscale coherent THz source transforms the LAO/STO interface into a promising platform for integrated lab-on-chip optoelectronic devices with various functionalities.

Source: Light Science & Applications

DOI: 10.1038/s41377-019-0135-0

Authors: Lu Chen, Erin Sutton, Hyungwoo Lee, Jung-Woo Lee, Jianan Li, Chang-Beom Eom, Patrick Irvin, Jeremy Levy

Institutions: University of Pittsburgh, Pittsburgh Quantum Institute, University of Wisconsin–Madison

Language: English

Topic: Terahertz technology and applications

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,975

Funders: National Science Foundation, U.S. Department of Defense, Materials Research Science and Engineering Center, Harvard University, Office of Naval Research, Division of Materials Research, Air Force Office of Scientific Research

OpenAlex ID: W2916449697