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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 38, Iss. 2 — Jan. 15, 2013
  • pp: 175–177

Carbon nanotube electrical-substitution cryogenic radiometer: initial results

N. A. Tomlin and J. H. Lehman  »View Author Affiliations

Optics Letters, Vol. 38, Issue 2, pp. 175-177 (2013)

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A carbon nanotube cryogenic radiometer (CNCR) has been fabricated for electrical-substitution optical power measurements. The CNCR employs vertically aligned multiwall carbon nanotube arrays (VANTAs) as the absorber, heater, and thermistor, with a micromachined silicon substrate as the weak thermal link. Compared to conventional cryogenic radiometers, the CNCR is simpler, more easily reproduced and disseminated, orders of magnitude faster, and can operate over a wide range of wavelengths without the need for a receiver cavity. We describe initial characterization results of the radiometer at 3.9 K, comparing electrical measurements and fiber-coupled optical measurements from 50 μW to 1.5 mW at the wavelength of 1550 nm. We find the response to input electrical and optical power is equivalent to within our measurement uncertainty, which is currently limited by the experimental setup (large temperature fluctuations of the cold stage) rather than the device itself. With improvements in the temperature stability, the performance of the CNCR should be limited only by our ability to measure the reflectance of the optical absorber VANTA.

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.4800) Instrumentation, measurement, and metrology : Optical standards and testing
(120.5630) Instrumentation, measurement, and metrology : Radiometry
(160.4236) Materials : Nanomaterials

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: November 14, 2012
Manuscript Accepted: November 28, 2012
Published: January 10, 2013

N. A. Tomlin and J. H. Lehman, "Carbon nanotube electrical-substitution cryogenic radiometer: initial results," Opt. Lett. 38, 175-177 (2013)

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