Photo-designed terahertz devices.

Scientific Reports
Takanori Okada, Koichiro Tanaka

Abstract

Technologies are being developed to manipulate electromagnetic waves using artificially structured materials such as photonic crystals and metamaterials, with the goal of creating primary optical devices. For example, artificial metallic periodic structures show potential for the construction of devices operating in the terahertz frequency regime. Here we demonstrate the fabrication of photo-designed terahertz devices that enable the real-time, wide-range frequency modulation of terahertz electromagnetic waves. These devices are comprised of a photo-induced, planar periodic-conductive structure formed by the irradiation of a silicon surface using a spatially modulated, femtosecond optical pulsed laser. We also show that the modulation frequency can be tuned by the structural periodicity, but is hardly affected by the excitation power of the optical pump pulse. We expect that our findings will pave the way for the construction of all-optical compact operating devices, such as optical integrated circuits, thereby eliminating the need for materials fabrication processes.

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Citations

Nov 10, 2015·Scientific Reports·Francesco P MezzapesaGaetano Scamarcio
Jan 8, 2014·Scientific Reports·G GeorgiouJ Gómez Rivas
Dec 11, 2014·Scientific Reports·Qi-Ye WenHuai-Wu Zhang
Nov 25, 2018·Optics Express·Haisu LiZhen Han
May 31, 2014·Optics Letters·Natsuki KandaMakoto Kuwata-Gonokami
Dec 5, 2019·Scientific Reports·I R HooperE Hendry
Dec 8, 2017·Optics Letters·Guillermo A Naranjo, Xomalin G Peralta
Jun 6, 2013·Optics Express·David ShrekenhamerWillie J Padilla
May 31, 2016··Jaime Gómez RivasMartijn C. Schaafsma

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