On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopy
Abstract Photonic nanojet (PNJ) of subwavelength spot-size originating at shadow side of a microsphere is projected as an imperative optical tool for micro-nano optics applications. Lack of a free hold PNJ source limits its vast potential. A state-of-the-art PNJ is introduced on a chemically etched...
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| Format: | Article |
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Nature Portfolio
2025-03-01
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| Series: | Communications Physics |
| Online Access: | https://doi.org/10.1038/s42005-025-02007-2 |
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| author | Kaushal Vairagi Jasleen Kaur Pooja Gupta Stefan Enoch Samir K. Mondal |
| author_facet | Kaushal Vairagi Jasleen Kaur Pooja Gupta Stefan Enoch Samir K. Mondal |
| author_sort | Kaushal Vairagi |
| collection | DOAJ |
| description | Abstract Photonic nanojet (PNJ) of subwavelength spot-size originating at shadow side of a microsphere is projected as an imperative optical tool for micro-nano optics applications. Lack of a free hold PNJ source limits its vast potential. A state-of-the-art PNJ is introduced on a chemically etched encaved optical fiber nanoprobe holding a microsphere. Nanoprobe generating optical beam of spot-size ~2 μm, is focused on the microsphere resulting in PNJ of varying spot-size, 0.8λ to 0.5λ, over its’ length ~13λ at 660 nm wavelength. A PNJ centered around 840 nm wavelength combined with an effective numerical aperture ~2 results in an en-face optical coherence tomography (OCT) image of lateral resolution ~247 nm and phase map with optical thickness, ~70 nm for a standard DVD. Further, the PNJ based backscattered nanoscopy of silver nano-particles is exhibited with resolution ~40 nm. This commercially viable PNJ head can be an ideal platform for various microscopies and other applications. |
| format | Article |
| id | doaj-art-870e0f5d8e4b4e1badb88cf296459d4c |
| institution | OA Journals |
| issn | 2399-3650 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Communications Physics |
| spelling | doaj-art-870e0f5d8e4b4e1badb88cf296459d4c2025-08-20T01:57:52ZengNature PortfolioCommunications Physics2399-36502025-03-01811710.1038/s42005-025-02007-2On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopyKaushal Vairagi0Jasleen Kaur1Pooja Gupta2Stefan Enoch3Samir K. Mondal4CSIR- Central Scientific Instruments OrganisationCSIR- Central Scientific Instruments OrganisationCSIR- Central Scientific Instruments OrganisationAix Marseille Univ, CNRS, Centrale Marseille, Institut FresnelCSIR- Central Scientific Instruments OrganisationAbstract Photonic nanojet (PNJ) of subwavelength spot-size originating at shadow side of a microsphere is projected as an imperative optical tool for micro-nano optics applications. Lack of a free hold PNJ source limits its vast potential. A state-of-the-art PNJ is introduced on a chemically etched encaved optical fiber nanoprobe holding a microsphere. Nanoprobe generating optical beam of spot-size ~2 μm, is focused on the microsphere resulting in PNJ of varying spot-size, 0.8λ to 0.5λ, over its’ length ~13λ at 660 nm wavelength. A PNJ centered around 840 nm wavelength combined with an effective numerical aperture ~2 results in an en-face optical coherence tomography (OCT) image of lateral resolution ~247 nm and phase map with optical thickness, ~70 nm for a standard DVD. Further, the PNJ based backscattered nanoscopy of silver nano-particles is exhibited with resolution ~40 nm. This commercially viable PNJ head can be an ideal platform for various microscopies and other applications.https://doi.org/10.1038/s42005-025-02007-2 |
| spellingShingle | Kaushal Vairagi Jasleen Kaur Pooja Gupta Stefan Enoch Samir K. Mondal On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopy Communications Physics |
| title | On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopy |
| title_full | On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopy |
| title_fullStr | On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopy |
| title_full_unstemmed | On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopy |
| title_short | On-fiber photonic nanojet enables super-resolution in en face optical coherence tomography and scattering nanoscopy |
| title_sort | on fiber photonic nanojet enables super resolution in en face optical coherence tomography and scattering nanoscopy |
| url | https://doi.org/10.1038/s42005-025-02007-2 |
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