We investigate conditions for Casimir Force (CF) reversal between two parallel half-space metamaterial plates
separated by air or vacuum at ambient temperatures. Practically, the Casimir effect can lead to stiction in
nanoscale devices, degradation and decreased performance. While material realizations of repulsive CF has been
proposed for high dielectric host materials, so far the CF reversal with air/vacuum as intermediate medium
remain challenging. Here, we propose a two plate design based on artificial electromagnetic materials known
as metamaterials. This configuration allows a simple analytical treatment that accurately describes the large
and short distance asymptotics of CF and allows extraction of important parameters such as lower and upper
cutoff gap distances that define the repulsive force window. A parametric study has been performed in terms
of the plate's dielectric and magnetic plasma frequencies, plate separation distance and temperature. The
parametric domain for achieving CF reversal is identified. If successfully implemented the proposed design could
potentially result in frictionless bio-fluid transport devices, quantum levitation and coating for ultra-clean room
environment.
A study of a generic multishell cloaking system that conceals an object from incident electromagnetic radiation
regardless of the object shape and/or material (optical) properties is presented. Transparency conditions based
on zero permittivity materials for both cylindrically and spherically symmetric systems are derived. It has been
shown that zero permittivity material shells can be realized using noble metals. In addition, we proposed a zero-index
lowloss tunable shell design based on metal-dielectric composite material to realize the cloak. Our results
show that the proposed design can achieve cloaking across the entire optical spectral range and can decrease
the scattering-cross section by a factor of up to 103. Furthermore, a full wave analysis is performed showing the
independence of cloak performance on the object shape and material properties. The proposed approach toward
clocking does not require optical magnetism and underline the importance of zero index materials for achieving
electromagnetic invisibility.
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