Abstract
We propose the idea of a subwavelength-sized light guide represented by
a linear chain of spherical metal nanoparticles in which light is transmitted
by electrodynamic interparticle coupling. The light-transport properties of
this system are investigated by use of model calculations based on generalized
Mie theory. Considering Ag particles of 50-nm diameter, we find optimum guiding
conditions for an interparticle spacing of 25 nm, and a corresponding signal-damping length of 900 nm is evaluated. The
proposed principle of optical energy transport may be useful for subwavelength
transmission lines within integrated optics circuits and for near-field optical
microscopy.
© 1998 Optical Society of America
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