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

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 subpicosecon...

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Bibliographic Details
Published in:Physical review letters 2021-07, Vol.127 (5), p.1-053902, Article 053902
Main Authors: Miyamaru, Fumiaki, Mizuo, Chihiro, Nakanishi, Toshihiro, Nakata, Yosuke, Hasebe, Kakeru, Nagase, Shintaro, Matsubara, Yu, Goto, Yusuke, Pérez-Urquizo, Joel, Madéo, Julien, Dani, Keshav M.
Format: Article
Language:English
Subjects:
Frequency shift
Pulse propagation
Switching
Terahertz frequencies
Wave propagation
Waveguides
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Summary: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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.127.053902