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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 47, Iss. 22 — Aug. 1, 2008
  • pp: 3999–4003

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

E. Theocharous, C. Engtrakul, A. C. Dillon, and J. Lehman  »View Author Affiliations


Applied Optics, Vol. 47, Issue 22, pp. 3999-4003 (2008)
http://dx.doi.org/10.1364/AO.47.003999


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Abstract

The performance of a 10 mm diameter pyroelectric detector coated with a single-wall carbon nanotube (SWCNT) was evaluated in the 0.8 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 performance of the detector in terms of noise equivalent power and detectivity in wavelength regions of high coating absorptivity was comparable with gold-black-coated pyroelectric detectors based on 50 μm thick Li Ta O 3 crystals. The response of this detector was shown to be nonlinear for DC equivalent photocurrents > 10 9 A , and its spatial uniformity of response was comparable with other pyroelectric detectors utilizing gold-black coatings. The nonuniform spectral responsivity exhibited by the SWCNT-coated detector is expected to severely restrict the use of SWCNTs as black coatings for thermal detectors. However, the deposition of SWCNT coatings on a pyroelectric crystal followed by the study of the prominence of the spectral features in the relative spectral responsivity of the resultant pyroelectric detectors is shown to provide an effective method for quantifying the impurity content in SWCNT samples.

OCIS Codes
(040.3060) Detectors : Infrared
(160.4236) Materials : Nanomaterials

ToC Category:
Detectors

History
Original Manuscript: June 6, 2008
Manuscript Accepted: June 19, 2008
Published: July 22, 2008

Citation
E. Theocharous, C. Engtrakul, A. C. Dillon, and J. Lehman, "Infrared responsivity of a pyroelectric detector with a single-wall carbon nanotube coating," Appl. Opt. 47, 3999-4003 (2008)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-47-22-3999

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