Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators
Large optical chirality in the vicinity of achiral high-index dielectric nanostructures has been recently demonstrated as useful means of enhancing molecular circular dichroism. We theoretically study the spatial dependence of optical chirality enhancement in the vicinity of high-index dielectric na...
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| Format: | Article |
| Language: | English |
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De Gruyter
2022-08-01
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| Series: | Nanophotonics |
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| Online Access: | https://doi.org/10.1515/nanoph-2022-0293 |
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| author | Czajkowski Krzysztof M. Antosiewicz Tomasz J. |
| author_facet | Czajkowski Krzysztof M. Antosiewicz Tomasz J. |
| author_sort | Czajkowski Krzysztof M. |
| collection | DOAJ |
| description | Large optical chirality in the vicinity of achiral high-index dielectric nanostructures has been recently demonstrated as useful means of enhancing molecular circular dichroism. We theoretically study the spatial dependence of optical chirality enhancement in the vicinity of high-index dielectric nanodisks and highlight its importance for the design of nanophotonic platforms for circular dichroism enhancement. Using a T-matrix framework, we demonstrate that, depending on the disk aspect ratio, chirality is enhanced preferentially along different directions. We employ various statistical procedures, including surface, volume and orientation averaging, to predict enhancement of chiroptical effects and show that optimal properties of a nanostructure depend substantially on whether spatial maximum or average chirality enhancement is sought after. The results indicate that at times it is beneficial to sacrifice helicity preservation for a larger field enhancement. Similarly, the optimal choice of the nanostructure is influenced by presence of a substrate, which limits the space available to be occupied by analyte molecules and impacts the optical chirality in the vicinity of the nanostructure. |
| format | Article |
| id | doaj-art-7c0fbd697dfa4e5fb800fe3d53dac8f5 |
| institution | OA Journals |
| issn | 2192-8614 |
| language | English |
| publishDate | 2022-08-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj-art-7c0fbd697dfa4e5fb800fe3d53dac8f52025-08-20T02:23:35ZengDe GruyterNanophotonics2192-86142022-08-0111184287429710.1515/nanoph-2022-0293Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonatorsCzajkowski Krzysztof M.0Antosiewicz Tomasz J.1Faculty of Physics, University of Warsaw, Pasteura 5, PL-02-093Warsaw, PolandFaculty of Physics, University of Warsaw, Pasteura 5, PL-02-093Warsaw, PolandLarge optical chirality in the vicinity of achiral high-index dielectric nanostructures has been recently demonstrated as useful means of enhancing molecular circular dichroism. We theoretically study the spatial dependence of optical chirality enhancement in the vicinity of high-index dielectric nanodisks and highlight its importance for the design of nanophotonic platforms for circular dichroism enhancement. Using a T-matrix framework, we demonstrate that, depending on the disk aspect ratio, chirality is enhanced preferentially along different directions. We employ various statistical procedures, including surface, volume and orientation averaging, to predict enhancement of chiroptical effects and show that optimal properties of a nanostructure depend substantially on whether spatial maximum or average chirality enhancement is sought after. The results indicate that at times it is beneficial to sacrifice helicity preservation for a larger field enhancement. Similarly, the optimal choice of the nanostructure is influenced by presence of a substrate, which limits the space available to be occupied by analyte molecules and impacts the optical chirality in the vicinity of the nanostructure.https://doi.org/10.1515/nanoph-2022-0293all-dielectric nanoresonatorscircular dichroismoptical chiralityt-matrix method |
| spellingShingle | Czajkowski Krzysztof M. Antosiewicz Tomasz J. Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators Nanophotonics all-dielectric nanoresonators circular dichroism optical chirality t-matrix method |
| title | Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators |
| title_full | Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators |
| title_fullStr | Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators |
| title_full_unstemmed | Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators |
| title_short | Local versus bulk circular dichroism enhancement by achiral all-dielectric nanoresonators |
| title_sort | local versus bulk circular dichroism enhancement by achiral all dielectric nanoresonators |
| topic | all-dielectric nanoresonators circular dichroism optical chirality t-matrix method |
| url | https://doi.org/10.1515/nanoph-2022-0293 |
| work_keys_str_mv | AT czajkowskikrzysztofm localversusbulkcirculardichroismenhancementbyachiralalldielectricnanoresonators AT antosiewicztomaszj localversusbulkcirculardichroismenhancementbyachiralalldielectricnanoresonators |