Microsphere-chain waveguides: Focusing and transport properties

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

doi:10.1063/1.4890595

Microsphere-chain waveguides: Focusing and transport properties

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

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45 Scopus citations

Abstract

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 language	English
Article number	021112
Journal	Applied Physics Letters
Volume	105
Issue number	2
DOIs	https://doi.org/10.1063/1.4890595
State	Published - Jul 14 2014

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title = "Microsphere-chain waveguides: Focusing and transport properties",

abstract = "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.",

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T2 - Focusing and transport properties

AU - Allen, Kenneth W.

AU - Darafsheh, Arash

AU - Abolmaali, Farzaneh

AU - Mojaverian, Neda

AU - Limberopoulos, Nicholaos I.

AU - Lupu, Anatole

AU - Astratov, Vasily N.

PY - 2014/7/14

Y1 - 2014/7/14

N2 - 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.

AB - 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.

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VL - 105

JO - Applied Physics Letters

JF - Applied Physics Letters

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Microsphere-chain waveguides: Focusing and transport properties

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