Comparison of near-field light intensities: plasmon nanofocusing vs localized plasmon resonance
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866910889831038976 |
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| author | Li, Tongyao Schirato, Andrea Suwabe, Taku Zaccaria, Remo Proietti Verma, Prabhat Umakoshi, Takayuki |
| author_facet | Li, Tongyao Schirato, Andrea Suwabe, Taku Zaccaria, Remo Proietti Verma, Prabhat Umakoshi, Takayuki |
| contents | The localized surface plasmon resonance of metallic nanostructures produces strongly localized and enhanced near-field light, significantly contributing to nanophotonics research and applications. Plasmon nanofocusing represents another method for generating near-field light through the propagation and condensation of plasmons on tapered plasmonic structures. In both methods, the intensity of near-field light is a critical aspect for many applications. In this study, we numerically inspect and compare the intensities of near-field light generated by either localized plasmon resonance or plasmon nanofocusing. To account for the light-induced changes in the optical properties of plasmonic structures, which in turn influence the near-field light intensity, we couple electromagnetic and thermal calculations to consider in a fully self-consistent manner the effects of the incident light and the light-induced temperature rise within the metal. A gold nanorod and a cone were adopted for exciting the localized plasmon resonance and plasmon nanofocusing, respectively. We find that plasmon nanofocusing generates approximately 1.5 times as strong near-field light as localized plasmon resonance. Our research provides a necessary foundation for generating near-field light, which is crucial for advancing the applications of near-field optics. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_17960 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Comparison of near-field light intensities: plasmon nanofocusing vs localized plasmon resonance Li, Tongyao Schirato, Andrea Suwabe, Taku Zaccaria, Remo Proietti Verma, Prabhat Umakoshi, Takayuki Optics The localized surface plasmon resonance of metallic nanostructures produces strongly localized and enhanced near-field light, significantly contributing to nanophotonics research and applications. Plasmon nanofocusing represents another method for generating near-field light through the propagation and condensation of plasmons on tapered plasmonic structures. In both methods, the intensity of near-field light is a critical aspect for many applications. In this study, we numerically inspect and compare the intensities of near-field light generated by either localized plasmon resonance or plasmon nanofocusing. To account for the light-induced changes in the optical properties of plasmonic structures, which in turn influence the near-field light intensity, we couple electromagnetic and thermal calculations to consider in a fully self-consistent manner the effects of the incident light and the light-induced temperature rise within the metal. A gold nanorod and a cone were adopted for exciting the localized plasmon resonance and plasmon nanofocusing, respectively. We find that plasmon nanofocusing generates approximately 1.5 times as strong near-field light as localized plasmon resonance. Our research provides a necessary foundation for generating near-field light, which is crucial for advancing the applications of near-field optics. |
| title | Comparison of near-field light intensities: plasmon nanofocusing vs localized plasmon resonance |
| topic | Optics |
| url | https://arxiv.org/abs/2503.17960 |