Associate Professor Rainer Leonhardt

Dipl. Phys. Dr. rer. nat.

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Associate Professor

Research | Current

 

  • THz Spectroscopy
    My current research interest is focussed on THz micro resonators. We are using different configurations to utilise whispering gallery modes (WGMs) to achieve ultra-high quality (Q) factors for our resonators. Some of the resonators are also tailored towards sensing applications, i.e. we want to use the evanescent field of the resonator for e.g. gas sensing.
  • We have a frequenct-domain THz spectrometer that covers the range from 0.1 THz to 1.0 THz with a frequency resolution of 4 MHz. This instrument allows us to measure resonators with quality factors of about 50,000, with our current (world) record of 15,000. We also have a time-domain THz spectrometer that covers the frequency range from 0.3 THz to 1.5 THz. This system is very useful in characterising some of the 'optical' components we use, like waveguides and lenses.

Areas of expertise

  • THz Spectroscopy
  • Micro Resonators
  • Laser Physics
  • Nonlinear Effects

 

Selected publications and creative works (Research Outputs)

  • Vogt, D. W., Jones, A. H., & Leonhardt, R. (2019). Free-space coupling of terahertz whispering-gallery modes. International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz. 10.1109/IRMMW-THz.2019.8873972
    Other University of Auckland co-authors: Dominik Vogt
  • Vogt, D. W., Jones, A. H., Schwefel, H. G. L., & Leonhardt, R. (2019). Anomalous blue-shift of terahertz whispering-gallery modes. International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz. 10.1109/IRMMW-THz.2019.8874233
    Other University of Auckland co-authors: Dominik Vogt
  • Vogt, D. W., Erkintalo, M., & Leonhardt, R. (2019). Terahertz frequency domain spectroscopy using hilbert transformation. 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019. 10.1109/CLEOE-EQEC.2019.8872428
    Other University of Auckland co-authors: Miro Erkintalo, Dominik Vogt
  • Vogt, D. W., Jones, A. H., & Leonhardt, R. (2019). Free-space coupling to symmetric high-Q terahertz whispering-gallery mode resonators. Optics letters, 44 (9), 2220-2223. 10.1364/ol.44.002220
    Other University of Auckland co-authors: Dominik Vogt
  • Vogt, D. W., Jones, A. H., Schwefel, H. G. L., & Leonhardt, R. (2018). Prism coupling of high-Q terahertz whispering-gallery-modes over two octaves from 0.2 THz to 1.1 THz. Optics express, 26 (24), 31190-31198. 10.1364/oe.26.031190
    URL: http://hdl.handle.net/2292/45853
    Other University of Auckland co-authors: Dominik Vogt
  • Vogt, D. W., & Leonhardt, R. (2018). Mode identification for ultra high-Q terahertz whispering-gallery modes. 2018 Conference on Lasers and Electro-Optics, CLEO 2018 - Proceedings.
    Other University of Auckland co-authors: Dominik Vogt
  • Vogt, D. W., Jones, A. H., & Leonhardt, R. (2018). Thermal tuning of silicon terahertz whispering-gallery mode resonators. Applied Physics Letters, 113 (1), 011101-011101. 10.1063/1.5036539
    URL: http://hdl.handle.net/2292/41574
    Other University of Auckland co-authors: Dominik Vogt
  • Vogt, D. W., & Leonhardt, R. (2018). Ultra-high Q terahertz whispering-gallery modes in a silicon resonator. APL Photonics, 3 (5), 051702-051702. 10.1063/1.5010364
    URL: http://hdl.handle.net/2292/42257
    Other University of Auckland co-authors: Dominik Vogt

Contact details

Primary office location

SCIENCE CENTRE 303 - Bldg 303
38 PRINCES ST
AUCKLAND CENTRAL
AUCKLAND 1010
New Zealand