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    Quasi-optical multiplexing using reflection phase gratings


    Lanigan, W. and Trappe, Neil and Murphy, J.Anthony and Colgan, R. and O'Sullivan, Créidhe and Withington, Stafford (2000) Quasi-optical multiplexing using reflection phase gratings. In: Proceedings : Eleventh International Symposium on Space Terahertz Technology. University of Michigan.

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    Abstract

    Heterodyne array receiver systems for both ground based and satellite telescope facilities are now becoming feasible for imaging in the submillimetre/terahertz regions of the EM spectrum. Phase gratings can be usefully employed as high efficiency passive multiplexing devices in the local oscillator (LO) injection chain of such receivers, ensuring that each element of the array is adequately biased and that the reflected LO power level at the array is minimised. For the wavelengths of interest both transmission and reflection gratings can be manufactured by milling an appropriate pattern of slots into the surface(s) of a suitable material. Thus, the required phase modulation is produced by the resulting pattern of varying optical path lengths suffered by the incident wave-front. We report on work we are undertaking to develop all reflection quasi-optical multiplexing systems so as to reduce reflection losses at the grating and minimise the number of surfaces that can contribute to standing wave effects in the optical system. As part of this endeavour we have also developed a quasi-optical technique for analysing the inevitable degradation due to multiple reflections on transmission grating design. This analysis is based on the Gaussian beam mode technique, and a further application of this technique allows one to assess tolerance limitations on the grating.

    Item Type: Book Section
    Keywords: Quasi-optical multiplexing; reflection phase gratings; Heterodyne array receiver systems;
    Academic Unit: Faculty of Science and Engineering > Experimental Physics
    Item ID: 9861
    Depositing User: Dr. Neil Trappe
    Date Deposited: 31 Aug 2018 15:31
    Publisher: University of Michigan
    Refereed: Yes
    Funders: Enterprise Ireland (EI)
    URI:

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