Ultrafast spatiotemporal chiroptical response of dielectric and plasmonic nanospheres
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arXiv
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| Format: | Preprint |
| Published: |
2023
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| _version_ | 1866909337772883968 |
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| author | Singh, Ankit Kumar Huang, Jer-Shing |
| author_facet | Singh, Ankit Kumar Huang, Jer-Shing |
| contents | We theoretically examine the spatiotemporal evolution of enhanced near-field optical chirality (OC) in both plasmonic and dielectric nanospheres when excited by ultrashort optical pulses. We demonstrate distinct spatiotemporal variations in near-field OC arising from the differing natures of plasmonic and dielectric resonators. The electric dipole resonant plasmonic nanosphere generates instantaneous near-field OC that relies on the interference between incident and scattered (induced) fields. Conversely, a resonant dielectric nanosphere sustains long-lasting OC even after the incident field diminishes due to the scattered field from resonant electric and magnetic dipole modes. We further demonstrate the control over the near-field OC using vector beams. Our work opens up opportunities for spatiotemporal control of nanostructure-enhanced chiral-light matter interactions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2310_14371 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Ultrafast spatiotemporal chiroptical response of dielectric and plasmonic nanospheres Singh, Ankit Kumar Huang, Jer-Shing Optics We theoretically examine the spatiotemporal evolution of enhanced near-field optical chirality (OC) in both plasmonic and dielectric nanospheres when excited by ultrashort optical pulses. We demonstrate distinct spatiotemporal variations in near-field OC arising from the differing natures of plasmonic and dielectric resonators. The electric dipole resonant plasmonic nanosphere generates instantaneous near-field OC that relies on the interference between incident and scattered (induced) fields. Conversely, a resonant dielectric nanosphere sustains long-lasting OC even after the incident field diminishes due to the scattered field from resonant electric and magnetic dipole modes. We further demonstrate the control over the near-field OC using vector beams. Our work opens up opportunities for spatiotemporal control of nanostructure-enhanced chiral-light matter interactions. |
| title | Ultrafast spatiotemporal chiroptical response of dielectric and plasmonic nanospheres |
| topic | Optics |
| url | https://arxiv.org/abs/2310.14371 |