تقرير
Lateral plasmonic superlattice in strongly dissipative regime
| العنوان: | Lateral plasmonic superlattice in strongly dissipative regime |
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| المؤلفون: | Gorbenko, I. V., Kachorovskii, V. Yu. |
| سنة النشر: | 2024 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Mesoscale and Nanoscale Physics |
| الوصف: | 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, $\gamma,$ is large compared to fundamental gate-tunable frequencies $\omega_{1,2}$ 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 $(\omega,\omega_2)$ for fixed $\omega_1$ is constructed. Most importantly, $\mathcal T$ sharply depends on the gate voltages and frequency. In particular, for $\omega_2 \ll \omega_1,$ $\mathcal T$ strongly varies on the very small frequency scale, $\delta \omega \ll \gamma,$ determined by the Maxwell relaxation, $\delta \omega \sim \omega_1^2/\gamma,$ so that the superlattice shows high responsivity within the frequency band $\delta \omega.$ Comment: 7 pages, 2 figures |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2405.06441 |
| رقم الأكسشن: | edsarx.2405.06441 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |