Three-dimensional subwavelength confinement of light with dielectric microspheres.
Dielectric microspheres are shown to be capable of confining light in a three-dimensional region of subwavelength dimensions when they are illuminated by tightly focused Gaussian beams. We show that a simple configuration, not involving resonances, permits one to reach an effective volume as small as 0.6 (lambda/n)(3). It is shown that this three-dimensional confinement arises from interferences between the field scattered by the sphere and the incident Gaussian beam containing high angular components.
Devilez
Alexis
A
Institut Fresnel, Aix-Marseille Université, CNRS, 13397 Marseille, France.
Bonod
Nicolas
N
Wenger
Jérôme
J
Gérard
Davy
D
Stout
Brian
B
Rigneault
Hervé
H
Popov
Evgeny
E
D003198:Computer Simulation; D008027:Light; D008863:Microspheres; D015233:Models, Statistical; D009391:Nephelometry and Turbidimetry / Q000379:methods*; D016011:Normal Distribution; D012031:Refractometry / Q000379:methods*; D012542:Scattering, Radiation