Ultrafast Frequency-Shift Dynamics at Temporal Boundary Induced by Structural-Dispersion Switching of Waveguides

Fumiaki Miyamaru, Chihiro Mizuo, Toshihiro Nakanishi, Yosuke Nakata, Kakeru Hasebe, Shintaro Nagase, Yu Matsubara, Yusuke Goto, Joel Pérez-Urquizo, Julien Madéo, and Keshav M. Dani
Phys. Rev. Lett. 127, 053902 – Published 30 July 2021
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Abstract

We experimentally demonstrate the observation of a frequency-shift dynamics at a temporal boundary in the terahertz (THz) region relying on a scheme that controls the structural dispersion of a metal-semiconductor waveguide. Ultrafast structural-dispersion switching is achieved within a subpicosecond timescale by illuminating a waveguide surface with an optical pump pulse during the propagation of a THz pulse in the waveguide. Owing to the relatively high conversion efficiency, up to 23%, under the condition that the frequency shift is sufficiently larger than the bandwidth of the incident pulse, the rapid variation of the THz frequency around the temporal boundary is directly observed in the time domain.

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  • Received 17 August 2020
  • Accepted 16 June 2021

DOI:https://doi.org/10.1103/PhysRevLett.127.053902

© 2021 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Fumiaki Miyamaru1, Chihiro Mizuo1, Toshihiro Nakanishi2, Yosuke Nakata3,4, Kakeru Hasebe1, Shintaro Nagase1, Yu Matsubara1, Yusuke Goto1, Joel Pérez-Urquizo5, Julien Madéo5, and Keshav M. Dani5

  • 1Department of Physics, Faculty of Science, Shinshu University, Nagano 390-8621, Japan
  • 2Department of Electronic Science and Engineering, Kyoto University, Kyoto 615-8510, Japan
  • 3Graduate School of Engineering Science, Osaka University, Osaka 560-8531, Japan
  • 4Center for Quantum Information and Quantum Biology, Osaka University, Osaka 560-8531, Japan
  • 5Femtosecond Spectroscopy Unit, Okinawa Institute of Science and Technology Graduate University, Okinawa 904-0495, Japan

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Issue

Vol. 127, Iss. 5 — 30 July 2021

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