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Hollow carbon spheres in microwaves: Bio inspired absorbing coating

: Bychanok, Dmitry S.; Li, S.; Sanchez-Sanchez, A.; Gorokhov, G.; Kuzhir, Polina P.; Ogrin, Feodor Yu; Pasc, Andrea; Ballweg, Thomas; Mandel, Karl-Sebastian; Szczurek, Andrzej; Fierro, V.; Celzard, Alain


Applied Physics Letters 108 (2016), Nr.1, Art. 013701, 6 S.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
Fraunhofer ISC ()

The electromagnetic response of a heterostructure based on a monolayer of hollow glassy carbon spheres packed in 2D was experimentally surveyed with respect to its response to microwaves, namely, the Ka-band (26–37 GHz) frequency range. Such an ordered monolayer of spheres mimics the well-known “moth-eye”-like coating structures, which are widely used for designing anti-reflective surfaces, and was modelled with the long-wave approximation. Based on the experimental and modelling results, we demonstrate that carbon hollow spheres may be used for building an extremely lightweight, almost perfectly absorbing, coating for Ka-band applications.