High performance 3D waveguide architecture for astronomical pupil-remapping interferometry

Simon Gross, Barnaby R. Norris, Nick Cvetojevic, Nemanja Jovanovic, Alexander Arriola, Paul N. Stewart, Jon S. Lawrence, Michael J. Withford, Peter G. Tuthill

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Here we demonstrate a new generation of photonic pupil-remapping devices which build upon the interferometric framework developed for the Dragonfly instrument: a high contrast waveguide-based device which recovers robust complex visibility observables. New generation Dragonfly devices overcome problems caused by interference from unguided light and low throughput, promising unprecedented on-sky performance. Closure phase measurement scatter of only similar to 0.2 degrees has been achieved, with waveguide throughputs of > 70%. This translates to a maximum contrast-ratio sensitivity (between the host star and its orbiting planet) at 1 lambda/D (1 sigma detection) of 5.3x10(-4) (when a conventional adaptive-optics (AO) system is used) or 1.8x10(-4) (for typical 'extreme-AO' performance), improving even further when random error is minimised by averaging over multiple exposures. This is an order of magnitude beyond conventional pupil-segmenting interferometry techniques (such as aperture masking), allowing a previously inaccessible part of the star to planet contrast-separation parameter space to be explored.

Original languageEnglish
Title of host publicationOptical and Infrared Interferometry IV
EditorsJK Rajagopal, MJ CreechEakman, F Malbet
Place of PublicationBellingham
Number of pages12
Publication statusPublished - 2014
EventConference on Optical and Infrared Interferometry IV - Montreal, Canada
Duration: 23 Jun 201427 Jun 2014

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


ConferenceConference on Optical and Infrared Interferometry IV


  • Interferometry
  • Pupil re-mapping
  • Direct exoplanet imaging
  • Waveguides
  • Photonics
  • VLT

Cite this

Gross, S., Norris, B. R., Cvetojevic, N., Jovanovic, N., Arriola, A., Stewart, P. N., Lawrence, J. S., Withford, M. J., & Tuthill, P. G. (2014). High performance 3D waveguide architecture for astronomical pupil-remapping interferometry. In JK. Rajagopal, MJ. CreechEakman, & F. Malbet (Eds.), Optical and Infrared Interferometry IV [91461B] (Proceedings of SPIE; Vol. 9146). SPIE. https://doi.org/10.1117/12.2057282