Microsphere-chain waveguides: Focusing and transport properties

Kenneth W. Allen, Arash Darafsheh, Farzaneh Abolmaali, Neda Mojaverian, Nicholaos I. Limberopoulos, Anatole Lupu, Vasily N. Astratov

Research output: Contribution to journalArticlepeer-review

44 Scopus citations


It is shown that the focusing properties of polystyrene microsphere-chain waveguides (MCWs) formed by sufficiently large spheres (D≥ 20λ, where D is the sphere diameter and λ is the wavelength of light) scale with the sphere diameter as predicted by geometrical optics. However, this scaling behavior does not hold for mesoscale MCWs with D ≤ 10λ resulting in a periodical focusing with gradually reducing beam waists and in extremely small propagation losses. The observed effects are related to properties of nanojet-induced and periodically focused modes in such structures. The results can be used for developing focusing microprobes, laser scalpels, and polarization filters.

Original languageEnglish
Article number021112
JournalApplied Physics Letters
Issue number2
StatePublished - Jul 14 2014


Dive into the research topics of 'Microsphere-chain waveguides: Focusing and transport properties'. Together they form a unique fingerprint.

Cite this