Chalcogenide glass planar MIR couplers for future chip based Bracewell interferometers

H. D. Kenchington Goldsmith, N. Cvetojevic, M. Ireland, P. Ma, P. Tuthill, B. Eggleton, J. S. Lawrence, S. Debbarma, B. Luther-Davies, S. J. Madden

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    9 Citations (Scopus)


    Photonic integrated circuits are established as the technique of choice for a number of astronomical processing functions due to their compactness, high level of integration, low losses, and stability. Temperature control, mechanical vibration and acoustic noise become controllable for such a device enabling much more complex processing than can realistically be considered with bulk optics. To date the benefits have mainly been at wavelengths around 1550 nm but in the important Mid-Infrared region, standard photonic chips absorb light strongly. Chalcogenide glasses are well known for their transparency to beyond 10000 nm, and the first results from coupler devices intended for use in an interferometric nuller for exoplanetary observation in the Mid-Infrared L' band (3800-4200 nm) are presented here showing that suitable performance can be obtained both theoretically and experimentally for the first fabricated devices operating at 4000 nm.

    Original languageEnglish
    Title of host publicationOptical and Infrared Interferometry and Imaging V
    EditorsMichelle J. Creech-Eakman, Fabien Malbet, Peter G. Tuthill
    ISBN (Electronic)9781510601932
    Publication statusPublished - 2016
    EventOptical and Infrared Interferometry and Imaging V - Edinburgh, United Kingdom
    Duration: 27 Jun 20161 Jul 2016

    Publication series

    NameProceedings of SPIE - The International Society for Optical Engineering
    ISSN (Print)0277-786X
    ISSN (Electronic)1996-756X


    ConferenceOptical and Infrared Interferometry and Imaging V
    Country/TerritoryUnited Kingdom


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