Tunable Tamm plasmon cavity as a scalable biosensing platform for surface enhanced resonance Raman spectroscopy

Kandammathe Valiyaveedu Sreekanth (), Jayakumar Perumal, U. S. Dinish, Patinharekandy Prabhathan, Yuanda Liu, Ranjan Singh (), Malini Olivo () and Jinghua Teng ()
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Kandammathe Valiyaveedu Sreekanth: Technology and Research (A*STAR)
Jayakumar Perumal: Technology and Research (A*STAR)
U. S. Dinish: Technology and Research (A*STAR)
Patinharekandy Prabhathan: Nanyang Technological University
Yuanda Liu: Technology and Research (A*STAR)
Ranjan Singh: Nanyang Technological University
Malini Olivo: Technology and Research (A*STAR)
Jinghua Teng: Technology and Research (A*STAR)

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract Surface enhanced Resonance Raman spectroscopy (SERRS) is a powerful technique for enhancing Raman spectra by matching the laser excitation wavelength with the plasmonic resonance and the absorption peak of biomolecules. Here, we propose a tunable Tamm plasmon polariton (TPP) cavity based on a metal on distributed Bragg reflector (DBR) as a scalable sensing platform for SERRS. We develop a gold film-coated ultralow-loss phase change material (Sb2S3) based DBR, which exhibits continuously tunable TPP resonances in the optical wavelengths. We demonstrate SERRS by matching the TPP resonance with the absorption peak of the chromophore molecule at 785 nm wavelength. We use this platform to detect cardiac Troponin I protein (cTnI), a biomarker for early diagnosis of cardiovascular disease, achieving a detection limit of 380 fM. This scalable substrate shows great promise as a next-generation tunable biosensing platform for detecting disease biomarkers in body fluids for routine real-time clinical diagnosis.

Date: 2023
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DOI: 10.1038/s41467-023-42854-7

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