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The Casimir effect has received extensive theoretical and experimental research attention in recent years. It arises from the macroscopic manifestation of quantum vacuum fluctuations, and this Casimir interaction force can be an effective means of driving and controlling components in MEMS and NEMS. Since the photonic topological insulator has brought new possibilities for the design and application of photonic devices, in this work we investigate the Casimir force between the multilayer structure of non-reciprocal photonic topological insulators with broken time-reversal symmetry, and examines the influence of the dielectric tensor of the photonic topological insulator, the spatial structural parameters of the multilayer system, and the rotational degree of freedom on the Casimir force. We find that there exists Casimir repulsive force in such multilayer system, and the Casimir stable equilibrium and restoring force can be further realized and controlled. Continuous variation between anti-mirror-symmetric and mirror-symmetric configurations is examined. Both the Casimir attraction and repulsion can be generally enhanced through structural optimization by increasing layer number and individual layer thickness. Furthermore, we focus on a detailed analysis on how the optical axis angle difference within the photonic topological insulator layers can be used to adjust the Casimir force. The overall relative rotation of the multilayer system may tune the magnitude and the orientation of the Casimir force, and some inflection points can be found in the influence curve of the optical axis angle difference between internal layers of the multilayer on the Casimir force, allowing the rotational degree of freedom in the multilayer system to be used for fine-tuning the Casimir interaction. This work introduces enhanced degrees of freedom for probing and manipulating the interaction between small objects in micro/nano systems, enabling both the suppression of adverse Casimir forces and their effective utilization.
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Keywords:
- Photonic topological insulator /
- Casimir effect /
- repulsive Casimir force /
- multilayered system
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