All-Dielectric Nanolaser with Subnanometer Field Confinement
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2020
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| _version_ | 1866914079774343168 |
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| author | Wu, Hao Xu, Peizhen Guo, Xin Wang, Pan Tong, Limin |
| author_facet | Wu, Hao Xu, Peizhen Guo, Xin Wang, Pan Tong, Limin |
| contents | The ability to generate a laser field with ultratight spatial confinement is important for pushing the limit of optical science and technology. Although plasmon lasers can offer sub-diffraction-confined laser fields, it is restricted by a trade-off between optical confinement and loss of free-electron oscillation in metals. We show here an all-dielectric nanolaser that can circumvent the confinement-loss trade-off, and offer a field confinement down to subnanometer level. The ultra-confined lasing field, supported by low-loss oscillation of polarized bound electrons surrounding a 1-nm-width slit in a coupled CdS nanowire pair, is manifested as the dominant peak of a TE0-like lasing mode around 520-nm wavelength, with a field confinement down to 0.23 nm and a peak-to-background ratio of ~32.7 dB. This laser may pave a way towards new regions for nanolasers and light-matter interaction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2012_03220 |
| institution | arXiv |
| publishDate | 2020 |
| record_format | arxiv |
| spellingShingle | All-Dielectric Nanolaser with Subnanometer Field Confinement Wu, Hao Xu, Peizhen Guo, Xin Wang, Pan Tong, Limin Optics The ability to generate a laser field with ultratight spatial confinement is important for pushing the limit of optical science and technology. Although plasmon lasers can offer sub-diffraction-confined laser fields, it is restricted by a trade-off between optical confinement and loss of free-electron oscillation in metals. We show here an all-dielectric nanolaser that can circumvent the confinement-loss trade-off, and offer a field confinement down to subnanometer level. The ultra-confined lasing field, supported by low-loss oscillation of polarized bound electrons surrounding a 1-nm-width slit in a coupled CdS nanowire pair, is manifested as the dominant peak of a TE0-like lasing mode around 520-nm wavelength, with a field confinement down to 0.23 nm and a peak-to-background ratio of ~32.7 dB. This laser may pave a way towards new regions for nanolasers and light-matter interaction. |
| title | All-Dielectric Nanolaser with Subnanometer Field Confinement |
| topic | Optics |
| url | https://arxiv.org/abs/2012.03220 |