Abstract

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

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