Room-Temperature Surface Exciton Polaritons in Colloidal J-Aggregate Flakes
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866916849841602560 |
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| author | Estévez-Varela, Carla Gama, José Nuno Castillo, Miguel Miranda, Adelaide De Beule, Pieter Pérez-Juste, Jorge Lopez-Garcia, Martin Pastoriza-Santos, Isabel Núñez-Sánchez, Sara |
| author_facet | Estévez-Varela, Carla Gama, José Nuno Castillo, Miguel Miranda, Adelaide De Beule, Pieter Pérez-Juste, Jorge Lopez-Garcia, Martin Pastoriza-Santos, Isabel Núñez-Sánchez, Sara |
| contents | J-aggregates are promising organic materials for nanophotonic applications due to their excitonic properties and ability to support surface exciton polaritons at room temperature, providing a robust platform for nanoscale light manipulation. While thin films composed of J-aggregates have demonstrated these advantages, colloidal J-aggregate nanoparticles remain underexplored. Herein, we report the synthesis of colloidal J-aggregate flakes by electrostatic interaction of cyanine molecules (TDBC) and oppositely charged polyelectrolytes (polydiallyldimethylammonium chloride, PDDA). These flakes exhibit colloidal stability maintaining the J-aggregate conformation even in solvents that favoured their monomeric state. The characterization of the colloidal J-aggregate flakes reveals their capability to support surface exciton polaritons at room temperature. This was further confirmed at single-particle level by observing an angular-independent Reststrahlen band near the excitonic resonance. In addition, the colloidal flakes exhibit a strong scattering component that broadens the extinction band and redshifts the photoluminescence, indicating that the colloidal architecture influences the optical response. These findings introduce a versatile colloidal system for constructing excitonic nanostructures tailored for advanced photonic applications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_13784 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Room-Temperature Surface Exciton Polaritons in Colloidal J-Aggregate Flakes Estévez-Varela, Carla Gama, José Nuno Castillo, Miguel Miranda, Adelaide De Beule, Pieter Pérez-Juste, Jorge Lopez-Garcia, Martin Pastoriza-Santos, Isabel Núñez-Sánchez, Sara Optics Mesoscale and Nanoscale Physics J-aggregates are promising organic materials for nanophotonic applications due to their excitonic properties and ability to support surface exciton polaritons at room temperature, providing a robust platform for nanoscale light manipulation. While thin films composed of J-aggregates have demonstrated these advantages, colloidal J-aggregate nanoparticles remain underexplored. Herein, we report the synthesis of colloidal J-aggregate flakes by electrostatic interaction of cyanine molecules (TDBC) and oppositely charged polyelectrolytes (polydiallyldimethylammonium chloride, PDDA). These flakes exhibit colloidal stability maintaining the J-aggregate conformation even in solvents that favoured their monomeric state. The characterization of the colloidal J-aggregate flakes reveals their capability to support surface exciton polaritons at room temperature. This was further confirmed at single-particle level by observing an angular-independent Reststrahlen band near the excitonic resonance. In addition, the colloidal flakes exhibit a strong scattering component that broadens the extinction band and redshifts the photoluminescence, indicating that the colloidal architecture influences the optical response. These findings introduce a versatile colloidal system for constructing excitonic nanostructures tailored for advanced photonic applications. |
| title | Room-Temperature Surface Exciton Polaritons in Colloidal J-Aggregate Flakes |
| topic | Optics Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2507.13784 |