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Optics Letters

Optics Letters


  • Vol. 36, Iss. 17 — Sep. 1, 2011
  • pp: 3347–3349

Waveguide trapping of hollow glass spheres

Balpreet Singh Ahluwalia, Pål Løvhaugen, and Olav Gaute Hellesø  »View Author Affiliations

Optics Letters, Vol. 36, Issue 17, pp. 3347-3349 (2011)

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Microparticles can be trapped and propelled by the evanescent field of optical waveguides. As the evanescent field only stretches 100 200 nm from the surface of the waveguide, only the lower caps of the microparticles interact directly with the field. This is taken advantage of by trapping hollow glass spheres on waveguides in the same way as solid glass spheres. For the chosen waveguide, numerical simulations show that hollow microspheres with a shell thickness above 60 nm can be stably trapped, while spheres with thinner shells are repelled. The average refractive index of the sphere–field intersection volume is used to explain the result in a qualitative way.

© 2011 Optical Society of America

OCIS Codes
(130.0130) Integrated optics : Integrated optics
(170.4520) Medical optics and biotechnology : Optical confinement and manipulation
(240.6690) Optics at surfaces : Surface waves
(350.4855) Other areas of optics : Optical tweezers or optical manipulation

ToC Category:
Medical Optics and Biotechnology

Original Manuscript: April 19, 2011
Revised Manuscript: July 19, 2011
Manuscript Accepted: July 28, 2011
Published: August 22, 2011

Virtual Issues
October 18, 2011 Spotlight on Optics

Balpreet Singh Ahluwalia, Pål Løvhaugen, and Olav Gaute Hellesø, "Waveguide trapping of hollow glass spheres," Opt. Lett. 36, 3347-3349 (2011)

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