Lateral plasmonic superlattice in strongly dissipative regime
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866910442261053440 |
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| author | Gorbenko, I. V. Kachorovskii, V. Yu. |
| author_facet | Gorbenko, I. V. Kachorovskii, V. Yu. |
| contents | We calculate transmission coefficient, $\mathcal T,$ of terahertz radiation through lateral plasmonic superlattice with a unit cell consisting of two regions with different plasma wave velocities, $s_1$ and $s_2$ ($s_1 > s_2$). We generalize theory developed earlier for resonant case to the non-resonant regime, when the scattering rate, $γ,$ is large compared to fundamental gate-tunable frequencies $ω_{1,2}$ of plasma oscillations in both regions. We find that absorption, and consequently $\mathcal T$, strongly depends on density modulation amplitude and on the frequency of the incoming radiation. We describe evolution of the absorption with increasing of radiation frequency from the quasi-static regime of very low frequency to the high-frequency regime, identify several dissipation regimes and find analytical expression for absorption, and, accordingly, for $\mathcal T,$ in these regimes. A general phase diagram of non-resonant regime in the plane $(ω,ω_2)$ for fixed $ω_1$ is constructed. Most importantly, $\mathcal T$ sharply depends on the gate voltages and frequency. In particular, for $ω_2 \ll ω_1,$ $\mathcal T$ strongly varies on the very small frequency scale, $δω\ll γ,$ determined by the Maxwell relaxation, $δω\sim ω_1^2/γ,$ so that the superlattice shows high responsivity within the frequency band $δω.$ |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_06441 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Lateral plasmonic superlattice in strongly dissipative regime Gorbenko, I. V. Kachorovskii, V. Yu. Mesoscale and Nanoscale Physics We calculate transmission coefficient, $\mathcal T,$ of terahertz radiation through lateral plasmonic superlattice with a unit cell consisting of two regions with different plasma wave velocities, $s_1$ and $s_2$ ($s_1 > s_2$). We generalize theory developed earlier for resonant case to the non-resonant regime, when the scattering rate, $γ,$ is large compared to fundamental gate-tunable frequencies $ω_{1,2}$ of plasma oscillations in both regions. We find that absorption, and consequently $\mathcal T$, strongly depends on density modulation amplitude and on the frequency of the incoming radiation. We describe evolution of the absorption with increasing of radiation frequency from the quasi-static regime of very low frequency to the high-frequency regime, identify several dissipation regimes and find analytical expression for absorption, and, accordingly, for $\mathcal T,$ in these regimes. A general phase diagram of non-resonant regime in the plane $(ω,ω_2)$ for fixed $ω_1$ is constructed. Most importantly, $\mathcal T$ sharply depends on the gate voltages and frequency. In particular, for $ω_2 \ll ω_1,$ $\mathcal T$ strongly varies on the very small frequency scale, $δω\ll γ,$ determined by the Maxwell relaxation, $δω\sim ω_1^2/γ,$ so that the superlattice shows high responsivity within the frequency band $δω.$ |
| title | Lateral plasmonic superlattice in strongly dissipative regime |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2405.06441 |