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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 3, Iss. 6 — Jun. 17, 2008

Direct imaging of photonic nanojets

Patrick Ferrand, Jérôme Wenger, Alexis Devilez, Martina Pianta, Brian Stout, Nicolas Bonod, Evgueni Popov , and Hervé Rigneault  »View Author Affiliations

Optics Express, Vol. 16, Issue 10, pp. 6930-6940 (2008)

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We report the direct experimental observation of photonic nanojets created by single latex microspheres illuminated by a plane wave at a wavelength of 520 nm. Measurements are performed with a fast scanning confocal microscope in detection mode, where the detection pinhole defines a diffraction-limited observation volume that is scanned in three dimensions over the microsphere vicinity. From the collected stack of images, we reconstruct the full 3 dimensional photonic nanojet beam. Observations are conducted for polystyrene spheres of 1, 3 and 5 µm diameter deposited on a glass substrate, the upper medium being air or water. Experimental results are compared to calculations performed using the Mie theory. We measure nanojet sizes as small as 270 nm FWHM for a 3 µm sphere at a wavelength λ of 520 nm. The beam keeps a subwavelength FWHM over a propagation distance of more than 3 λ, displaying all the specificities of a photonic nanojet.

© 2008 Optical Society of America

OCIS Codes
(180.0180) Microscopy : Microscopy
(230.3990) Optical devices : Micro-optical devices
(260.2110) Physical optics : Electromagnetic optics
(290.4020) Scattering : Mie theory

ToC Category:

Original Manuscript: December 20, 2007
Revised Manuscript: January 31, 2008
Manuscript Accepted: January 31, 2008
Published: May 1, 2008

Virtual Issues
Vol. 3, Iss. 6 Virtual Journal for Biomedical Optics

Patrick Ferrand, Jérôme Wenger, Alexis Devilez, Martina Pianta, Brian Stout, Nicolas Bonod, Evgueni Popov, and Hervé Rigneault, "Direct imaging of photonic nanojets," Opt. Express 16, 6930-6940 (2008)

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