Broad band electromagnetic wave absorbers designed with nano-metal films
Article first published online: 24 NOV 2009
Copyright © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Annalen der Physik
Volume 19, Issue 1-2, pages 53–59, February 2010
How to Cite
Nimtz, G. and Panten, U. (2010), Broad band electromagnetic wave absorbers designed with nano-metal films. Ann. Phys., 19: 53–59. doi: 10.1002/andp.200910389
- Issue published online: 27 JAN 2010
- Article first published online: 24 NOV 2009
- Manuscript Revised: 23 OCT 2009
- Manuscript Accepted: 23 OCT 2009
- Manuscript Received: 16 JUL 2009
- Electromagnetic waves;
- nano-metal films;
- electromagnetic absorber.
In the thirties of the last century it was shown that nano-metal films have a frequency independent absorption in the far infrared regime and below. Moreover, the absorption A of these films is 0.5 and at the same time both reflection R and transmission T are 0.25, complying with the relation A + R + T = 1 at a sheet resistance Z□of 60 πΩ. The latter property of nano-metal films was shown by Woltersdorff in 1934. Multiple reflections between such films allow the design of low reflecting large scale absorbers for the wave length range from far infrared to low frequency radio waves. Experimental data of the novel absorber device measured in the GHz frequency range are presented. The electrical nano-metal film properties are also useful for applications in IR-photonics and IR-communication systems. The article presents a brief review of the historical studies on free carrier electromagnetic wave absorption and on novel applications.