Holding and amplifying electromagnetic waves with temporal non-Foster metastructures
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2023
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| _version_ | 1866912599749165056 |
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| author | Pacheco-Peña, Victor Kiasat, Yasaman Solís, Diego M. Edwards, Brian Engheta, Nader |
| author_facet | Pacheco-Peña, Victor Kiasat, Yasaman Solís, Diego M. Edwards, Brian Engheta, Nader |
| contents | We introduce a mechanism that can both hold and amplify electromagnetic waves by rapidly changing the permittivity of the medium during the wave travel from a positive to a dispersionless (i.e. non-Foster) negative value and then back again. The underlying physics behind this phenomenon is theoretically explored by considering a plane wave in an unbounded medium. Interestingly, we show that a rapid positive-to-negative temporal change of ε(t) causes the propagation of the wave to stop (observed by a frozen phase in time) while the amplitude of the frozen field exponentially grows. Stepping the permittivity back to the original (or a new) positive value will cause the wave to thaw and resume propagation with the original (or the new) frequency, respectively. We numerically study the case of dipole radiation in such time-varying non-Foster structures. As a possible implementation, we propose a parallel plate waveguide platform loaded with time-dependent media emulating parallel lumped non-Foster negative capacitors. Such non-Foster time-varying structures may open new venues in controlling and manipulating wave-matter interaction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2304_03861 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Holding and amplifying electromagnetic waves with temporal non-Foster metastructures Pacheco-Peña, Victor Kiasat, Yasaman Solís, Diego M. Edwards, Brian Engheta, Nader Optics Applied Physics We introduce a mechanism that can both hold and amplify electromagnetic waves by rapidly changing the permittivity of the medium during the wave travel from a positive to a dispersionless (i.e. non-Foster) negative value and then back again. The underlying physics behind this phenomenon is theoretically explored by considering a plane wave in an unbounded medium. Interestingly, we show that a rapid positive-to-negative temporal change of ε(t) causes the propagation of the wave to stop (observed by a frozen phase in time) while the amplitude of the frozen field exponentially grows. Stepping the permittivity back to the original (or a new) positive value will cause the wave to thaw and resume propagation with the original (or the new) frequency, respectively. We numerically study the case of dipole radiation in such time-varying non-Foster structures. As a possible implementation, we propose a parallel plate waveguide platform loaded with time-dependent media emulating parallel lumped non-Foster negative capacitors. Such non-Foster time-varying structures may open new venues in controlling and manipulating wave-matter interaction. |
| title | Holding and amplifying electromagnetic waves with temporal non-Foster metastructures |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2304.03861 |