Near orthogonal launch of SPR modes in Au films
John Canning, Akib Karim, Nikki Tzoumis, Yanzhen Tan, Rodolfo Patyk,, Brant C. Gibson
TL;DR
This paper demonstrates a novel method for exciting surface plasmon resonance modes in gold films near the orthogonal axis, using a scattering mechanism to enable coupling and localization, with potential applications in sensing.
Contribution
It introduces a new approach for near orthogonal SPR mode excitation in gold films through scattering, expanding the capabilities of plasmonic sensing techniques.
Findings
Successful spectroscopic measurement of SPR shifts with different liquids.
Identification of scattering as the mechanism enabling SPR coupling.
Observation of plasmon localization near the orthogonal axis.
Abstract
We report the excitation of a surface plasmon resonance (SPR) close to the orthogonal axis of a gold (Au) film on borosilicate glass. Direct spectroscopic measurement of SPR shifts using different liquids are made at ~5{\deg} incidence within a reflection spectrophotometer. Scattering of light that is able to penetrate across the film at the interfaces is the proposed mechanism by which coupling, and plasmon localization, is established.
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