title: Control of plasmonic nanoantennas by reversible metal-insulator transition.
abstract: We demonstrate dynamic reversible switching of VO2 insulator-to-metal transition (IMT) locally on the scale of 15 nm or less and control of nanoantennas, observed for the first time in the near-field. Using polarization-selective near-field imaging techniques, we simultaneously monitor the IMT in VO2 and the change of plasmons on gold infrared nanoantennas. Structured nanodomains of the metallic VO2 locally and reversibly transform infrared plasmonic dipole nanoantennas to monopole nanoantennas. Fundamentally, the IMT in VO2 can be triggered on femtosecond timescale to allow ultrafast nanoscale control of optical phenomena. These unique features open up promising novel applications in active nanophotonics.
authors.affiliation: Center for Nano-Optics (CeNO), Georgia State University, Atlanta, Georgia 30303, USA.|Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA.
authors.forename: Yohannes
authors.initials: Y
authors.lastname: Abate
authors.affiliation: Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN 37235-1406.
authors.forename: Robert E
authors.initials: RE
authors.lastname: Marvel
authors.affiliation: Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN 37235-1406.
authors.forename: Jed I
authors.initials: JI
authors.lastname: Ziegler
authors.affiliation: Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA.
authors.forename: Sampath
authors.initials: S
authors.lastname: Gamage
authors.affiliation: Center for Nano-Optics (CeNO), Georgia State University, Atlanta, Georgia 30303, USA.|Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA.
authors.forename: Mohammad H
authors.initials: MH
authors.lastname: Javani
authors.affiliation: Center for Nano-Optics (CeNO), Georgia State University, Atlanta, Georgia 30303, USA.|Department of Physics and Astronomy, Georgia State University, Atlanta, Georgia 30303, USA.
authors.forename: Mark I
authors.initials: MI
authors.lastname: Stockman
authors.affiliation: Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN 37235-1406.|Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235-1807.
authors.forename: Richard F
authors.initials: RF
authors.lastname: Haglund