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Broadband infrared and THz transmitting silicon core optical fiber

Abstract

Silicon waveguide structures are a viable alternative for the transmission of signals over a wide range of frequencies, and new fabrication methods are key to increased applications. In this work, THz transparency of silicon-core, silica clad fibers, refined using a traveling solvent method, is demonstrated. The ≈ 200 µm core of these fibers is shown to have good transmission from 4.8–9 µm and 1–7 THz. Fibers were drawn on a conventional optical fiber tower using the scalable molten core technique and CO2 laser annealed, resulting in large-grain crystalline cores with broadband transmission. The spectral properties are comparable to those of rectangular guides of similar cross-sectional area cut from high resistivity float zone silicon wafers.
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Category

Academic article

Language

English

Author(s)

  • Trygve Sørgård
  • Seunghan Song
  • Per Erik Vullum
  • Cristine Kores
  • Kjell Martin Mølster
  • Fredrik Laurell
  • Thomas A. Hawkins
  • John Ballato
  • Ulf Lennart Österberg
  • Ursula Gibson

Affiliation

  • SINTEF Industry / Materials and Nanotechnology
  • Royal Institute of Technology
  • Norwegian University of Science and Technology
  • Dartmouth College
  • Clemson University

Year

2020

Published in

Optical Materials Express

Volume

10

Issue

10

Page(s)

2491 - 2499

View this publication at Norwegian Research Information Repository