Multiresonant metasurface for Raman spectroscopy beyond single molecule detection level
Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University in Torun, ul. Grudziadzka 5, 87–100 Torun, Poland
2 Deutsches Elektronen-Synchrotron DESY, Notkestr. 85, 22607 Hamburg, Germany
3 Physics Department, Universität Hamburg UHH, Luruper Chaussee 149, 22761 Hamburg, Germany
* e-mail: firstname.lastname@example.org
Accepted: 7 March 2022
Published online: 17 June 2022
A metasurface in the metal-insulator-grating configuration is designed and optimised to support enhancement of coherent Raman signal of selected molecules orders of magnitude above the single-molecule detection threshold. The tunability is demonstrated by adjusting the structure to match selected Raman peaks of rhodamine, however, its spectral response is broad enough to cover a range of Raman shifts. Finally, the grating allows switching between distinct values of Raman shift with a single metasurface illuminated at different angles.
Key words: metasurface / coherent anti-stokes Raman scattering / surface plasmon / plasmonic grating / molecular spectroscopy
© S. Izadshenas et al., Published by EDP Sciences, 2022
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