Generalized Conductivity Modeling and Selective Harmonic Amplification in Time-Modulated Graphene Cavities
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| Main Authors: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866914591225675776 |
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| author | Koutzoglou, Ioannis M. Amanatiadis, Stamatios Kantartzis, Nikolaos V. Karamanos, Theodosios D. |
| author_facet | Koutzoglou, Ioannis M. Amanatiadis, Stamatios Kantartzis, Nikolaos V. Karamanos, Theodosios D. |
| contents | The selective harmonic enhancement in cavities formed by stacks of time-modulated graphene sheets and a reflecting boundary is investigated. A semi-analytic framework based on an operator formulation and the transfer matrix method is developed and validated against a modified finite-difference time-domain algorithm. The temporal dispersion of graphene is treated through both a generalized Taylor-expanded conductivity model and a reduced high-bias approximation. By employing particle swarm optimization to tune the cavity gaps, selected Floquet harmonics are engineered under distinct modulation regimes. Numerical results show strong enhancement of first-order sidebands in the high-bias regime, controlled third-order harmonic generation beyond the linear regime with an explicit trade-off between target amplification and total non-target leakage, and symmetry-induced purely even harmonic generation under zero-centered modulation. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2605_23374 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Generalized Conductivity Modeling and Selective Harmonic Amplification in Time-Modulated Graphene Cavities Koutzoglou, Ioannis M. Amanatiadis, Stamatios Kantartzis, Nikolaos V. Karamanos, Theodosios D. Applied Physics Optics The selective harmonic enhancement in cavities formed by stacks of time-modulated graphene sheets and a reflecting boundary is investigated. A semi-analytic framework based on an operator formulation and the transfer matrix method is developed and validated against a modified finite-difference time-domain algorithm. The temporal dispersion of graphene is treated through both a generalized Taylor-expanded conductivity model and a reduced high-bias approximation. By employing particle swarm optimization to tune the cavity gaps, selected Floquet harmonics are engineered under distinct modulation regimes. Numerical results show strong enhancement of first-order sidebands in the high-bias regime, controlled third-order harmonic generation beyond the linear regime with an explicit trade-off between target amplification and total non-target leakage, and symmetry-induced purely even harmonic generation under zero-centered modulation. |
| title | Generalized Conductivity Modeling and Selective Harmonic Amplification in Time-Modulated Graphene Cavities |
| topic | Applied Physics Optics |
| url | https://arxiv.org/abs/2605.23374 |