Abstract
In this study, we demonstrate that periods of metallic gratings on elastomeric substrates can be tuned with external strain and hence are found to control the resonance condition of surface plasmon polaritons. We have excited the plasmon resonance on the elastomeric grating coated with gold and silver. The grating period is increased up to 25% by applying an external mechanical strain. The tunability of the elastomeric substrate provides the opportunity to use such gratings as efficient surface enhanced Raman spectroscopy substrates. It's been demonstrated that the Raman signal can be maximized by applying an external mechanical strain to the elastomeric grating.
Highlights
The surface plasmon resonance (SPR) phenomena observed on noble metal surfaces or nanoparticles has been a great interest in several fields of research such as nanoscale photonics and biological sensing [1]
The grating period is increased up to 25% by applying an external mechanical strain
We demonstrate that periods of metallic gratings on elastomeric substrates can be tuned with external strain and are found to control the resonance condition of surface plasmon polaritons
Summary
The surface plasmon resonance (SPR) phenomena observed on noble metal surfaces or nanoparticles has been a great interest in several fields of research such as nanoscale photonics and biological sensing [1]. A similar optimization is needed to be done for sensing applications of the presence of a particular biological molecule or a chemical reaction In this regard, the tunability of the SPR wavelength provides flexibility in many plasmonic sensing applications. Flexible designs utilizing electronic [8], ferroelectric [9] or thermal [10, 11] tuning mechanisms are reported in the literature Those methods are reversible and can be applied after the plasmonic structure is fabricated. The mechanical tunability of such gratings are used in several applications such as dry adhesives [16] with tunable surface roughness and adhesion, light scanners [17], spectrometry [18], and for possible application to stretchable electronics [19] Such elastomeric gratings are used for the excitation of SPP on flat metallic surfaces [20]
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