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Infrared responsivity of a pyroelectric detector with a single wall carbon nanotube coating.

Theocharous, E; Engtrakul, C*; Dillon, A C*; Lehman, J* (2008) Infrared responsivity of a pyroelectric detector with a single wall carbon nanotube coating. Appl. Opt., 47 (22). pp. 3999-4003.

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Abstract

The performance of a 10 mm diameter pyroelectric detector coated with a single wall carbon nanotube (SWCNT) coating was evaluated in the 0.8 µm to 20 µm wavelength range. The relative spectral responsivity of this detector exhibits significant fluctuations over the wavelength range examined. This is consistent with independent absorbance measurements which show that SWCNTs exhibit selective absorption bands in the visible and near infrared. The non-uniform spectral responsivity is expected to severely restrict the use of SWCNTs as black coatings for thermal detectors. The performance of the detector in terms of noise equivalent power (NEP) and detectivity (D*) in wavelength regions of high coating absorptivity was comparable to goldblack-coated pyroelectric detectors based on 50 µm thick LiTaO3 crystals. The response of this detector was shown to be non-linear for DC equivalent photocurrents greater than about 10-9 A, and its spatial uniformity of response was comparable to other pyroelectric detectors utilising goldblack coatings.

Item Type: Article
Subjects: Optical Radiation and Photonics
Optical Radiation and Photonics > Radiometry and Detectors
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4250

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