Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopy
Abstract In the nanoparticle-on-a-slit (NPoS) cavity, a variation of the nanoparticle-on-a-mirror geometry, a metallic nanoparticle is placed on a functionalized narrow slit created on a metal plate so that two nanometric-scale gaps enable extreme plasmonic localization. For many applications, it is...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2025-05-01
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| Series: | npj Nanophotonics |
| Online Access: | https://doi.org/10.1038/s44310-025-00064-7 |
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| author | Javier Redolat Daniel Arenas-Ortega Ángela Barreda Amadeu Griol Elena Pinilla-Cienfuegos Alejandro Martínez |
| author_facet | Javier Redolat Daniel Arenas-Ortega Ángela Barreda Amadeu Griol Elena Pinilla-Cienfuegos Alejandro Martínez |
| author_sort | Javier Redolat |
| collection | DOAJ |
| description | Abstract In the nanoparticle-on-a-slit (NPoS) cavity, a variation of the nanoparticle-on-a-mirror geometry, a metallic nanoparticle is placed on a functionalized narrow slit created on a metal plate so that two nanometric-scale gaps enable extreme plasmonic localization. For many applications, it is desirable to integrate such cavities on a chip and provide access to (and collection from) the hot spots via integrated waveguides. In this work, we propose, design, and experimentally demonstrate the efficient integration of NPoS cavities with dielectric waveguides on a silicon-based chip. We show that both the fundamental TE and TM modes of silicon-nitride slot waveguides can drive the cavity, making our device polarization-insensitive. We demonstrate our concept by performing surface-enhanced Raman spectroscopy of BPT molecules on a chip fabricated by standard silicon processes mixed with the deterministic positioning of gold nanospheres on the gap of a plasmonic dipole, which remarkably can also work as an infrared antenna. |
| format | Article |
| id | doaj-art-dbc9cc3ee86a42cbb7ddb814af51a791 |
| institution | OA Journals |
| issn | 2948-216X |
| language | English |
| publishDate | 2025-05-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | npj Nanophotonics |
| spelling | doaj-art-dbc9cc3ee86a42cbb7ddb814af51a7912025-08-20T01:51:28ZengNature Portfolionpj Nanophotonics2948-216X2025-05-012111010.1038/s44310-025-00064-7Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopyJavier Redolat0Daniel Arenas-Ortega1Ángela Barreda2Amadeu Griol3Elena Pinilla-Cienfuegos4Alejandro Martínez5Nanophotonics Technology Center, Universitat Politècnica de ValènciaNanophotonics Technology Center, Universitat Politècnica de ValènciaDepartment Electronic Technology, Carlos III University of MadridNanophotonics Technology Center, Universitat Politècnica de ValènciaNanophotonics Technology Center, Universitat Politècnica de ValènciaNanophotonics Technology Center, Universitat Politècnica de ValènciaAbstract In the nanoparticle-on-a-slit (NPoS) cavity, a variation of the nanoparticle-on-a-mirror geometry, a metallic nanoparticle is placed on a functionalized narrow slit created on a metal plate so that two nanometric-scale gaps enable extreme plasmonic localization. For many applications, it is desirable to integrate such cavities on a chip and provide access to (and collection from) the hot spots via integrated waveguides. In this work, we propose, design, and experimentally demonstrate the efficient integration of NPoS cavities with dielectric waveguides on a silicon-based chip. We show that both the fundamental TE and TM modes of silicon-nitride slot waveguides can drive the cavity, making our device polarization-insensitive. We demonstrate our concept by performing surface-enhanced Raman spectroscopy of BPT molecules on a chip fabricated by standard silicon processes mixed with the deterministic positioning of gold nanospheres on the gap of a plasmonic dipole, which remarkably can also work as an infrared antenna.https://doi.org/10.1038/s44310-025-00064-7 |
| spellingShingle | Javier Redolat Daniel Arenas-Ortega Ángela Barreda Amadeu Griol Elena Pinilla-Cienfuegos Alejandro Martínez Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopy npj Nanophotonics |
| title | Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopy |
| title_full | Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopy |
| title_fullStr | Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopy |
| title_full_unstemmed | Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopy |
| title_short | Polarization-insensitive integration of nanoparticle-on-a-slit cavities with dielectric waveguides for on-chip surface enhanced Raman spectroscopy |
| title_sort | polarization insensitive integration of nanoparticle on a slit cavities with dielectric waveguides for on chip surface enhanced raman spectroscopy |
| url | https://doi.org/10.1038/s44310-025-00064-7 |
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