• Broadband infrared and THz transmitting silicon core optical fiber 

      Sørgård, Trygve; Song, Seunghan; Vullum, Per Erik; Kores, Cristine; Mølster, Kjell Martin; Laurell, Fredrik; Hawkins, Thomas A.; Ballato, John; Österberg, Ulf Lennart; Gibson, Ursula (Peer reviewed; Journal article, 2020)
      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 ...
    • Terahertz imaging of composite materials in reflection and transmission mode with a time-domain spectroscopy system 

      Sørgård, Trygve; van Rheenen, Arthur; Haakestad, Magnus W. (Conference object; Peer reviewed, 2016)
      A fiber-coupled Terahertz time domain spectroscopy (THz-TDS) system based on photoconductive antennas, pumped by a 100-fs fiber laser, has been used to characterize materials in transmission and reflection mode. THz images ...
    • Terahertz waveguiding in glass+clad silicon wafers 

      Sørgård, Trygve; Mølster, Kjell Martin; Laurell, Fredrik; Pasiskevicius, Valdas; Gibson, Ursula; Österberg, Ulf Lennart (Journal article; Peer reviewed, 2020)
      The waveguiding properties of high-resistivity float zone silicon slab waveguides are characterized over the spectral range from 0.5 to 7.5 THz. Waveguide modes and dispersion are observed for lengths of 1.2 cm and silicon ...
    • Time-domain spectroscopy of KTiOPO4 in the frequency range 0.6 - 7.0 THz 

      Mølster, Kjell Martin; Sørgård, Trygve; Laurell, Hugo; Canalias, Carlota; Pasiskevicius, Valdas; Laurell, Fredrik; Österberg, Ulf Lennart (Journal article; Peer reviewed, 2019)
      We report on THz time-domain spectroscopy measurements of flux grownKTiOPO4in the frequency range 0.6–7.0 THz (20 to 240 cm−1). Our results compare well with earlierRaman and far-infrared measurements. We theorize that the ...