Off resonant Fano enhanced single molecule resolution imaging with a CW source
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914210945957888 |
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| author | Ovali, Rasim Volga Aytas, Taner Tarik Sahin, Ramazan Tasgin, Mehmet Emre |
| author_facet | Ovali, Rasim Volga Aytas, Taner Tarik Sahin, Ramazan Tasgin, Mehmet Emre |
| contents | Apertureless scanning near-field optical microscopy (a-SNOM) is typically limited to ~10 nm resolution by the tip apex size. We demonstrate that ~1-nm resolution can be achieved under continuous-wave (CW) illumination by exploiting Fano path interference. A defect center that naturally forms at the apex of a metal-coated AFM tip acts as a quantum object and induces Fano interference, forcing a stronger but normally off-resonant plasmonic mode (597 nm) to operate effectively on resonance at the driving wavelength (520 nm). Because this interference occurs only beneath the defect, a ~1-nm-wide, strongly enhanced near-field hotspot is created. Using this off-resonant Fano-enhanced field, we achieve single-molecule-resolution imaging based on exact three-dimensional Maxwell simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_15936 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Off resonant Fano enhanced single molecule resolution imaging with a CW source Ovali, Rasim Volga Aytas, Taner Tarik Sahin, Ramazan Tasgin, Mehmet Emre Optics Apertureless scanning near-field optical microscopy (a-SNOM) is typically limited to ~10 nm resolution by the tip apex size. We demonstrate that ~1-nm resolution can be achieved under continuous-wave (CW) illumination by exploiting Fano path interference. A defect center that naturally forms at the apex of a metal-coated AFM tip acts as a quantum object and induces Fano interference, forcing a stronger but normally off-resonant plasmonic mode (597 nm) to operate effectively on resonance at the driving wavelength (520 nm). Because this interference occurs only beneath the defect, a ~1-nm-wide, strongly enhanced near-field hotspot is created. Using this off-resonant Fano-enhanced field, we achieve single-molecule-resolution imaging based on exact three-dimensional Maxwell simulations. |
| title | Off resonant Fano enhanced single molecule resolution imaging with a CW source |
| topic | Optics |
| url | https://arxiv.org/abs/2512.15936 |