Abstract
The realization of advanced materials with strong, low-loss, and pure magnetic responses to radiation fields both in linear and nonlinear regimes is an important and long-standing goal for fundamental physics and practical applications. Here, we propose a physical scheme for obtaining such responses by using a metamaterial constructed by an array of unit cells consisting of two coupled varactor-loaded split-ring resonators working under the condition of plasmon-induced transparency (PIT). We show that the PIT in such metamaterial not only significantly suppresses radiation absorption but also greatly enhances magnetic Kerr nonlinearity, which may be many orders of magnitude larger than that obtained by conventional magnetic materials reported up to now. Based on such a nonlinear metamaterial, we further show that stable magnetic solitons with ultraslow propagation velocity and very low generation power can be created. Our research opens a route for designing novel metamaterial devices with strong, low-loss, pure, and actively tunable magnetic responses and for obtaining stable and low-power nonlinear magnetic pulses, which are promising for applications in information processing and transmission.
- Received 14 February 2020
- Accepted 12 May 2020
DOI:https://doi.org/10.1103/PhysRevA.101.053859
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