Bracken, CP;
Lightfoot, J;
O'Sullivan, C;
Murphy, JA;
Donohoe, A;
Savini, G;
Juanola-Parramon, R;
(2018)
Multimode simulations of a wide field of view double-Fourier far-infrared spatio-spectral interferometer.
Journal of Astronomical Telescopes, Instruments, and Systems
, 4
(1)
, Article 018004. 10.1117/1.JATIS.4.1.018004.
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Abstract
In the absence of 50-m class space-based observatories, subarcsecond astronomy spanning the full far-infrared wavelength range will require space-based long-baseline interferometry. The long baselines of up to tens of meters are necessary to achieve subarcsecond resolution demanded by science goals. Also, practical observing times command a field of view toward an arcminute (1′) or so, not achievable with a single on-axis coherent detector. This paper is concerned with an application of an end-to-end instrument simulator PyFIInS, developed as part of the FISICA project under funding from the European Commission’s seventh Framework Programme for Research and Technological Development (FP7). Predicted results of wide field of view spatio–spectral interferometry through simulations of a long-baseline, double-Fourier, far-infrared interferometer concept are presented and analyzed. It is shown how such an interferometer, illuminated by a multimode detector can recover a large field of view at subarcsecond angular resolution, resulting in similar image quality as that achieved by illuminating the system with an array of coherent detectors. Through careful analysis, the importance of accounting for the correct number of higher-order optical modes is demonstrated, as well as accounting for both orthogonal polarizations. Given that it is very difficult to manufacture waveguide and feed structures at sub-mm wavelengths, the larger multimode design is recommended over the array of smaller single mode detectors. A brief note is provided in the conclusion of this paper addressing a more elegant solution to modeling far-infrared interferometers, which holds promise for improving the computational efficiency of the simulations presented here.
| Type: | Article |
|---|---|
| Title: | Multimode simulations of a wide field of view double-Fourier far-infrared spatio-spectral interferometer |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1117/1.JATIS.4.1.018004 |
| Publisher version: | http://dx.doi.org/10.1117/1.JATIS.4.1.018004 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Far-infrared FISICA, interferometry double-Fourier PyFIInS (Python Far-Infrared Instrument Simulator) optics, quasi-optics, physical optics. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10047749 |
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