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., & Leonhardt, R. (2018). Ultra-high Q terahertz whispering-gallery modes in a silicon resonator. APL Photonics, 3 (5), 051702-051702. 10.1063/1.5010364
    Other University of Auckland co-authors: Dominik Vogt
  • Vogt, D. W., & Leonhardt, R. (2017). Terahertz whispering gallery mode bubble resonator. Optica, 4 (7), 809-812. 10.1364/OPTICA.4.000809
    Other University of Auckland co-authors: Dominik Vogt
  • Yudasari, N., Anthony, J., & Leonhardt, R. (2014). Terahertz pulse propagation in 3D-printed waveguide with metal wires component. Optics Express, 22 (21), 26042-26054. 10.1364/OE.22.026042
  • Argyros, A., Leon-Saval, S. G., Lwin, R., Provo, R., Murdoch, S. G., Harvey, J. D., ... Kuhlmey, B. T. (2012). Polymer optical fibres: Conventional and microstructured fibres. Progress in Biomedical Optics and Imaging - Proceedings of SPIE. 10.1117/12.916068
    Other University of Auckland co-authors: Stuart Murdoch, John Harvey
  • Anthony, J., Leonhardt, R., Leon-Saval, S. G., & Argyros, A. (2011). THz propagation in kagome hollow-core microstructured fibers. OPTICS EXPRESS, 19 (19), 18470-18478. 10.1364/OE.19.018470
  • Xu, Y. Q., Murdoch, S. G., Leonhardt, R., & Harvey, J. D. (2008). Widely tunable photonic crystal fiber Fabry-Perot optical parametric oscillator. Optics Letters, 33 (12), 1351-1353. 10.1364/OL.33.001351
    Other University of Auckland co-authors: Ray Xu, Stuart Murdoch, John Harvey
  • Sadgrove, M., Wimberger, S., Parkins, S., & Leonhardt, R. (2008). Scaling law and stability for a noisy quantum system. Physical Review E, 78.10.1103/PhysRevE.78.025206
    Other University of Auckland co-authors: Scott Parkins
  • Lo, Y. H., & Leonhardt, R. (2008). Aspheric Lenses for Terahertz Imaging. Optics Express, 16 (20), 15991-15998. 10.1364/OE.16.015991

Contact details

Primary office location

Level 6, Room 619
New Zealand