Comparison of Chiral Metamaterial Designs for Repulsive Casimir Force

TL;DR

This paper compares four chiral metamaterial designs to identify the most promising candidates for achieving repulsive Casimir forces, highlighting the importance of large chirality and optimal structure-to-wavelength ratios.

Contribution

It evaluates and compares four different chiral metamaterial designs to determine which are best suited for generating repulsive Casimir forces.

Findings

Four-U-SRRs and Conjugate-Swastikas are the most promising designs.

Large chirality and small structure-to-wavelength ratio are key factors.

These designs show potential for practical repulsive Casimir force applications.

Abstract

In our previous work [Phys. Rev. Lett. 103, 103602 (2009)], we found that repulsive Casimir forces could be realized by using chiral metamaterials if the chirality is strong enough. In this work, we check four different chiral metamaterial designs (i.e., Twisted-Rosettes, Twisted-Crosswires, Four-U-SRRs, and Conjugate-Swastikas) and find that the designs of Four-U-SRRs and Conjugate-Swastikas are the most promising candidates to realize repulsive Casimir force because of their large chirality and the small ratio of structure length scale to resonance wavelength.