Abstract
We investigate the dispersion relation and extinction properties of surface plasmons in an array of gold nanoparticle chains under s-polarized plane wave excitations, through experiment and simulation. Our results reveal that the dispersion and extinction properties of gold nanoparticle chains at an air/glass interface are significantly different from those in a uniform medium. Under total internal reflection, the dispersion is much larger than that above total internal reflection and 100% extinction can be reached. We show that the large dispersion under total internal reflection can be explained by dipole fields and coupling at the air/glass interface.
Highlights
Surface plasmons in periodic structures composed of noble metal nanoparticles are of great interest because of potential applications in communications and in optical sensing
We recently reported experimental measurements of the dispersion relations of surface plasmons in an array of gold nanoparticle chains at a air/glass interface using transmission spectroscopy with a range of incident angles [19]
Because transmission spectroscopy was employed, the experimental results only covered the portion of the dispersion relations above total internal reflection (TIR)
Summary
Surface plasmons in periodic structures composed of noble metal nanoparticles are of great interest because of potential applications in communications and in optical sensing. Theoretical and experimental studies have been reported on such coupling interactions and the resulting dispersion and loss properties of the coupled surface plasmon modes in a uniform dielectric medium [2,13,14,15,16]. We recently reported experimental measurements of the dispersion relations of surface plasmons in an array of gold nanoparticle chains at a air/glass interface using transmission spectroscopy with a range of incident angles [19]. We report experimentally obtained transmission and reflection characteristics of the s-polarized surface plasmon mode in an array of gold nanoparticle chains over a full range of incidence angles (0° ~ 90°). In the last part of the paper, we give a theoretical explanation of the dispersion behavior in terms of dipole fields and coupling along an air/glass interface
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