Slow, Nanometer Light Confinement Observed in Atomically Thin TaS2
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arXiv
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2024
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| _version_ | 1866909695233490944 |
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| author | Do, Hue T. B. Zhao, Meng Li, Pengfei Soh, Yu Wei Rangaraj, Jagadesh Liu, Bingyan Jiang, Tianyu Zhang, Xinyue Lu, Jiong Song, Peng Teng, Jinghua Bosman, Michel |
| author_facet | Do, Hue T. B. Zhao, Meng Li, Pengfei Soh, Yu Wei Rangaraj, Jagadesh Liu, Bingyan Jiang, Tianyu Zhang, Xinyue Lu, Jiong Song, Peng Teng, Jinghua Bosman, Michel |
| contents | Extreme light confinement down to the atomic scale has been theoretically predicted for ultrathin, Ta-based transition metal dichalcogenides (TMDs). In this work, we experimentally demonstrate in 2H-TaS$_2$ monolayers and bilayers a lateral confinement ratio up to 300 at large wave vectors of $q = 0.15 \, Å^{-1}$, and slow light behaviour with a group velocity $\sim 10^{-4}c$. Quantitative momentum-resolved electron energy loss spectroscopy (q-EELS) with a momentum resolution of $0.0056 \, Å^{-1}$ was used as a platform for the nanoscale optical measurements. With it, momentum-dispersed, two-dimensional (2D) plasmon resonances were experimentally observed, showing a transition from 2D to 3D Coulomb interaction in the high-momentum regime, equivalent to light confinement volumes of $1\text{-}2 \, \text{nm}^3$. Remarkably, the resonant modes do not enter the electron-hole continuum, predicting even further enhanced optical field confinements for this material at cryogenic temperatures. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_07572 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Slow, Nanometer Light Confinement Observed in Atomically Thin TaS2 Do, Hue T. B. Zhao, Meng Li, Pengfei Soh, Yu Wei Rangaraj, Jagadesh Liu, Bingyan Jiang, Tianyu Zhang, Xinyue Lu, Jiong Song, Peng Teng, Jinghua Bosman, Michel Materials Science Mesoscale and Nanoscale Physics Extreme light confinement down to the atomic scale has been theoretically predicted for ultrathin, Ta-based transition metal dichalcogenides (TMDs). In this work, we experimentally demonstrate in 2H-TaS$_2$ monolayers and bilayers a lateral confinement ratio up to 300 at large wave vectors of $q = 0.15 \, Å^{-1}$, and slow light behaviour with a group velocity $\sim 10^{-4}c$. Quantitative momentum-resolved electron energy loss spectroscopy (q-EELS) with a momentum resolution of $0.0056 \, Å^{-1}$ was used as a platform for the nanoscale optical measurements. With it, momentum-dispersed, two-dimensional (2D) plasmon resonances were experimentally observed, showing a transition from 2D to 3D Coulomb interaction in the high-momentum regime, equivalent to light confinement volumes of $1\text{-}2 \, \text{nm}^3$. Remarkably, the resonant modes do not enter the electron-hole continuum, predicting even further enhanced optical field confinements for this material at cryogenic temperatures. |
| title | Slow, Nanometer Light Confinement Observed in Atomically Thin TaS2 |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2411.07572 |