Bracken, Colm P. and Lightfoot, John and O'Sullivan, Créidhe and Murphy, J.Anthony and Donohoe, Anthony and Savini, Giorgio and Juanola-Parramon, Roser
(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).
ISSN 2329-4124
Abstract
In the absence of 50 m class space-based observatories, sub-arc-second astronomy spanning the full far-infrared
wavelength range will require space-based long-baseline interferometry. The long baselines of up to 10’s of meteres
are necessary to achieve sub arcsecond resolution demanded by the science goals. Also, practical observing times
command a field of view toward an arc minute 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 7th 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 analysed. It
is shown how such an interferometer, illuminated by a multimode detector can recover a large field of view at
sub-arcsecond 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 polarisations.
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 novel, more elegant solution to modelling far-infrared interferometers,
which holds promise for improving the computational efficiency of the simulations presented here.
Item Type: |
Article
|
Keywords: |
Far-infrared; FISICA; interferometry; double-Fourier; PyFIInS; Python Far-Infrared Instrument Simulator; optics; quasi-optics; physical optics; |
Academic Unit: |
Faculty of Science and Engineering > Experimental Physics |
Item ID: |
13063 |
Identification Number: |
https://doi.org/10.1117/1.JATIS.4.1.018004 |
Depositing User: |
Dr. Créidhe O'Sullivan
|
Date Deposited: |
18 Jun 2020 13:52 |
Journal or Publication Title: |
Journal of Astronomical Telescopes, Instruments, and Systems |
Publisher: |
Society of Photo-optical Instrumentation Engineers |
Refereed: |
Yes |
URI: |
|
Use Licence: |
This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available
here |
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