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Published on: September 2, 2017
Dispersion and extinction of surface plasmons in an array of gold nanoparticle chains: influence of the air/glass
1School of Engineering and Applied Sciences, Harvard University, 33 Oxford Street, Maxwell Dworkin, Cambridge, Massachusetts 02138, USA. tianyang@deas.harvard.edu
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.
