@article{oai:repo.qst.go.jp:00080313,
 author = {SHIMIZU, YUHEI and Koshikawa, Hiroshi and IMBE, MASATOSHI and Yamaki, Tetsuya and AMEMIYA, KUNIAKI and Koshikawa, Hiroshi and Yamaki, Tetsuya},
 issue = {15},
 journal = {Optics Express},
 month = {Jul},
 note = {We present a large-area perfect blackbody sheet, which would offer a planar standard radiator for high-precision thermal imager calibration. Polydimethylsiloxane (PDMS) sheets with nano-precision surface micro-cavity structures achieve both ultra-low reflectance (ultra-high emissivity close to unity) over the thermal infrared wavelengths and high durability to mechanical contact. The investigation on the geometrical parameters of the conical micro-cavities, that is, radii and aspect ratios (ratio of height to radius), confirmed that the PDMS blackbody sheet with a micro-cavity radius of ~6 μm and an aspect ratio of ~4 exhibits the optimum hemispherical reflectance of less than 0.002 (emissivity of higher than 0.998) at the thermal wavelengths (6–15 μm). Furthermore, the large-area PDMS blackbody sheet of 100 mm × 80 mm maintained an excellent in-plane uniformity of the emissivity. This unprecedented large-area perfect blackbody conforms to the International Electrotechnical Commission (IEC) standard recommendation regarding thermal imager calibration for fever screening in terms of the emissivity performance.},
 pages = {22606--22616},
 title = {Large-area perfect blackbody sheets having aperiodic array of surface micro-cavities for high-precision thermal imager calibration},
 volume = {28},
 year = {2020}
}