| タイトル | Fundamental Limits on the Imaging and Polarisation Properties of Far-Infrared Detectors |
| 本文（外部サイト） | http://hdl.handle.net/2060/20090043011 |
| 著者（英） | Wollack, Edward J.; Thomas, Christopher N.; Moseley, S. Harvey; Withington, Stafford; Chuss, David T. |
| 著者所属（英） | NASA Goddard Space Flight Center |
| 発行日 | 2009-01-01 |
| 言語 | eng |
| 内容記述 | Far-infrared bolometric detectors are used extensively in ground-based and space-borne astronomy, and thus it is important to understand their optical behaviour precisely. We have studied the intensity and polarisation response of free-space bolometers, and shown that when the size of the absorber is reduced below a wavelength, the response changes from being that of a classical optical detector to that of a few-mode antenna. We have calculated the modal content of the reception patterns, and found that for any volumetric detector having a side length of less than a wavelength, three magnetic and three electric dipoles characterize the behaviour. The size of the absorber merely determines the relative strengths of the contributions. The same formalism can be applied to thin-film absorbers, where the induced current is forced to flow in a plane. In this case, one magnetic and two electric dipoles characterize the behaviour. The ability to model easily the intensity, polarisation, and straylight characteristics of electrically-small detectors will be of great value when designing high-performance polarimetric imaging arrays. |
| NASA分類 | Instrumentation and Photography |
| 権利 | Copyright, Distribution as joint owner in the copyright |
|
