Volume 126, Number 1, April 2019
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|Published online||06 May 2019|
Reduction of the Casimir force in Al due to oxidation
Instituto de Física, Universidad Nacional Autónoma de México - Apdo. Postal 20-364, CDMX 01000, México
Received: 27 December 2018
Accepted: 5 April 2019
The modification of the Casimir force due to the oxidation of an aluminum layer is calculated as a function of the oxidation fraction of the surface. Aluminum has a large plasma frequency, and thus a large Casimir force is expected. As the surface oxidizes, it forms a thin oxide layer that is passivated. The effect of this layer is to decrease the force significantly, even though the oxide layer is only 5 nm thick. To understand the large effect on the force, we calculate the reflectograms in real-frequency space and show the degradation of the evanescent modes due to the growth of the oxide layer.
PACS: 68.65.Ac – Multilayers / 78.20.-e – Optical properties of bulk materials and thin films
© EPLA, 2019
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