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15 March 2023 Over-coupled Helmholtz-like optical resonator for broadband surface enhanced infrared absorption (SEIRA) spectroscopy
Laura Paggi, Alice Fabas, Hasnaa El Ouazzani, Jean-Paul Hugonin, Nathalie Bardou, Christophe Dupuis, Jean-Jacques Greffet, Patrick Bouchon
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Proceedings Volume 12430, Quantum Sensing and Nano Electronics and Photonics XIX; 1243013 (2023) https://doi.org/10.1117/12.2649643
Event: SPIE OPTO, 2023, San Francisco, California, United States
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Abstract
Many sub-wavelength structures have been used to enhance the infrared fingerprint of molecules in order to develop sensitive and versatile infrared spectroscopy molecular detection tools. Helmholtz-like optical resonators have the ability to strongly enhance electric fields in relatively large volumes and show good angular stability while their fabrication process is well mastered, what makes them interesting for an application to surface enhanced infrared absorption (SEIRA) spectroscopy. The overcoupled configuration shows new advantages compared to other coupling regimes: it can enhance the signature of vibrational modes of poly(methyl methacrylate) (PMMA) up to 70% over 5 μm wide wavelength range with a unique resonator. This study presents the behaviour of this promising structure compared to the original Helmholtz optical resonator and the application of different coupling regimes to SEIRA spectroscopy of PMMA, underlining the advantages of the overcoupling regime previously demonstrated.
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Laura Paggi, Alice Fabas, Hasnaa El Ouazzani, Jean-Paul Hugonin, Nathalie Bardou, Christophe Dupuis, Jean-Jacques Greffet, and Patrick Bouchon "Over-coupled Helmholtz-like optical resonator for broadband surface enhanced infrared absorption (SEIRA) spectroscopy", Proc. SPIE 12430, Quantum Sensing and Nano Electronics and Photonics XIX, 1243013 (15 March 2023); https://doi.org/10.1117/12.2649643
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KEYWORDS
Optical resonators
Infrared spectroscopy
Light absorption
Absorption spectroscopy
Spectroscopy
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