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Lehman JH, Lee B, Grossman EN. Far infrared thermal detectors for laser radiometry using a carbon nanotube array. Appl Opt. 2011;50(21):4099-104doi: 10.1364/AO.50.004099.
Lehman, J. H., Lee, B., & Grossman, E. N. (2011). Far infrared thermal detectors for laser radiometry using a carbon nanotube array. Applied optics, 50(21), 4099-104. https://doi.org/10.1364/AO.50.004099
Lehman, John H, et al. "Far infrared thermal detectors for laser radiometry using a carbon nanotube array." Applied optics vol. 50,21 (2011): 4099-104. doi: https://doi.org/10.1364/AO.50.004099
Lehman JH, Lee B, Grossman EN. Far infrared thermal detectors for laser radiometry using a carbon nanotube array. Appl Opt. 2011 Jul 20;50(21):4099-104. doi: 10.1364/AO.50.004099. PMID: 21772397.
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Appl Opt. 2011 Jul 20;50(21):4099-104. doi: 10.1364/AO.50.004099.

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

Applied optics

John H Lehman, Bob Lee, Erich N Grossman

Affiliations

  1. Physical Measurement Laboratory, National Institute of Standards and Technology, 325 Broadway, Boulder, Colorado 80305, USA. [email protected]

PMID: 21772397 DOI: 10.1364/AO.50.004099

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.

© 2011 Optical Society of America

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