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Optics Letters

Optics Letters


  • Vol. 36, Iss. 17 — Sep. 1, 2011
  • pp: 3350–3352

Nanofiltering via integrated liquid core waveguides

Nimi Gopalakrishnan, Mads Brøkner Christiansen, and Anders Kristensen  »View Author Affiliations

Optics Letters, Vol. 36, Issue 17, pp. 3350-3352 (2011)

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We demonstrate and describe how nanoporous liquid core waveguides can exclude scattering particles, making them an ideal integrated platform for analysis of turbid solutions. Milk with 0.5% fat showed an optical propagation loss of 0.05 dB / mm at 633 nm in nanoporous waveguides compared to the 10.6 dB / mm loss in standard cuvette measurements. To examine the nanofiltering effect, waveguides were infiltrated with solutions containing Rhodamine B molecules ( 1 nm ) and 22 nm red fluorescing polystyrene beads. With fluorescence spectroscopy we show that 22 nm beads are excluded, while Rhodamine B molecules penetrate the waveguides. This is further confirmed by fluorescence microscopy, also revealing a homogenous distribution of Rhodamine in the waveguide volume.

© 2011 Optical Society of America

OCIS Codes
(230.3120) Optical devices : Integrated optics devices
(250.5460) Optoelectronics : Polymer waveguides
(280.1415) Remote sensing and sensors : Biological sensing and sensors
(220.4241) Optical design and fabrication : Nanostructure fabrication

ToC Category:
Optical Devices

Original Manuscript: May 11, 2011
Revised Manuscript: July 1, 2011
Manuscript Accepted: August 2, 2011
Published: August 22, 2011

Nimi Gopalakrishnan, Mads Brøkner Christiansen, and Anders Kristensen, "Nanofiltering via integrated liquid core waveguides," Opt. Lett. 36, 3350-3352 (2011)

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