Indium Plasmonic Thin Films as Substrates for Kretschmann Configuration-Based SPR Sensing and FDTD Analysis of Oxide-Enhanced UV-SERS.

Cole P Ebel, Daniel D Stuart, Santino N Valiulis, Westley Van Zant, Quan Cheng

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Article in ACS applied nano materials, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 authors.

Cole P EbelDepartment of Chemistry, University of California, Riverside, California, 92521, USA.ORCID 0000-0003-2664-9935

Daniel D StuartDepartment of Chemistry, University of California, Riverside, California, 92521, USA.ORCID 0000-0001-6282-9373

Santino N ValiulisDepartment of Chemistry, University of California, Riverside, California, 92521, USA.ORCID 0009-0005-8058-0184

Westley Van ZantDepartment of Chemistry, University of California, Riverside, California, 92521, USA.ORCID 0000-0002-4123-3551

Quan ChengDepartment of Chemistry, University of California, Riverside, California, 92521, USA.ORCID 0000-0003-0934-358X

Funding

Glycolipid biointerface to decipher disease-implicated ganglioside-protein interactionsR01GM148803 · NIGMS · UNIVERSITY OF CALIFORNIA RIVERSIDE · PI QUAN JASON CHENG · 2023 to 2026

$1.5M

NIGMS NIH HHS R01 GM148803

6 · The paper itself

Abstract

Fundamental studies of uncommon plasmonic materials expand their potential applications in nanoplasmonics. In this work, nanometers thin films of indium, a plasmonic yet rarely explored metal, were characterized for its surface plasmon polariton (SPP) properties and the performance in surface plasmon resonance (SPR) sensing and surface-enhanced Raman spectroscopy (SERS). Direct deposition of indium films on glass slides exhibited coalescence of discrete particles and generated no SPR response due to gaps disrupting SPP propagation. Addition of a 2-nm Cr base layer reduced the particle size and produced a resonance dip under the Kretschmann configuration. SPR sensing with a 2/40 nm Cr/In film was demonstrated for the first time and compared to the standard 2/50 nm Cr/Au film, revealing a sensitivity approximately 77% that of the gold film. The optical properties of the passivating In

Indexed as

finite-difference time-domainindium oxidationindium plasmonicsKretschmann configurationsurface enhanced Raman spectroscopysurface plasmon resonance

Identifiers

PMID42222604

DOI10.1021/acsanm.5c04612

PMCPMC13218660

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