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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 50, Iss. 21 — Jul. 20, 2011
  • pp: 4099–4104

Far infrared thermal detectors for laser radiometry using a carbon nanotube array

John H. Lehman, Bob Lee, and Erich N. Grossman  »View Author Affiliations


Applied Optics, Vol. 50, Issue 21, pp. 4099-4104 (2011)
http://dx.doi.org/10.1364/AO.50.004099


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Abstract

We present a description of a 1.5 mm long, vertically aligned carbon nanotube array (VANTA) on a thermopile and separately on a pyroelectric detector. Three VANTA samples, having average lengths of 40 μm , 150 μm , and 1.5 mm were evaluated with respect to reflectance at a laser wavelength of 394 μm ( 760 GHz ), and we found that the reflectance decreases substantially with increasing tube length, ranging from 0.38 to 0.23 to 0.01, respectively. The responsivity of the thermopile by electrical heating ( 98.4 mA / W ) was equal to that by optical heating ( 98.0 mA / W ) within the uncertainty of the measurement. We analyzed the frequency response and temporal response and found a thermal decay period of 500 ms , which is consistent with the specific heat of comparable VANTAs in the literature. The extremely low (0.01) reflectance of the 1.5 mm VANTAs and the fact that the array is readily transferable to the detector’s surface is, to our knowledge, unprecedented.

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(140.3070) Lasers and laser optics : Infrared and far-infrared lasers
(260.3090) Physical optics : Infrared, far
(040.2235) Detectors : Far infrared or terahertz

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: May 3, 2011
Revised Manuscript: June 24, 2011
Manuscript Accepted: June 28, 2011
Published: July 18, 2011

Citation
John H. Lehman, Bob Lee, and Erich N. Grossman, "Far infrared thermal detectors for laser radiometry using a carbon nanotube array," Appl. Opt. 50, 4099-4104 (2011)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-50-21-4099

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