Planar hyperblack absolute radiometer Article Swipe

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Responsivity Radiometer Optics Materials science Radiometry Noise-equivalent power Transmittance Thermistor Wavelength Optoelectronics Photodetector Physics Quantum mechanics

John H. Lehman , Andreas Steiger , Nathan A. Tomlin , M. G. White , M. Kehrt , Ivan Rýger , Michelle Stephens , C. Monte , I. Mueller , J. Hollandt , Marla L. Dowell ·

YOU? · · 2016 · Open Access · · DOI: https://doi.org/10.1364/oe.24.025911 · OA: W2546082815

The absolute responsivity of a planar cryogenic radiometer fabricated from micromachined silicon and having carbon nanotubes, as the absorber and thermistor were measured in the visible and far infrared (free-field terahertz) wavelength range by means of detector-based radiometry. The temperature coefficient of the thermistor near 4.8 K and noise equivalent power were evaluated along with independent characterization of the window transmittance and specular reflectance of the nanotube absorber. Measurements of absolute power by means of electrical substitution are compared to the German national standard and the uncertainty of the radiometer responsivity as a function of wavelength is summarized.