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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 5, Iss. 12 — Sep. 30, 2010

Detection of colored nanomaterials using evanescent field-based waveguide sensors

Makoto Fujimaki, Ken-ichi Nomura, Kazuki Sato, Takafumi Kato, Subash C.B. Gopinath, Xiaomin Wang, Koichi Awazu, and Yoshimichi Ohki  »View Author Affiliations

Optics Express, Vol. 18, Issue 15, pp. 15732-15740 (2010)

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We have developed an optical system designed for detecting colored nanomaterials in aqueous solutions, using the concept of evanescent-field-coupled waveguide-mode sensors. In this study, we found that the waveguide modes induced in the sensor are intrinsically sensitive to a change in optical absorption, or a ‘change in color’. The system detects less than one gold nanoparticle (diameter: 20 nm) adsorbed per square micrometer. It is also demonstrated that significant signal enhancement due to adsorption of molecules is achieved using a dye. The developed sensor rarely suffers from a drawback of impurity adsorption. The system is expected to be applied as an effective sensing tool for metal colloids, nanoparticles, and colored biomolecules in solution.

© 2010 OSA

OCIS Codes
(120.4820) Instrumentation, measurement, and metrology : Optical systems
(230.7370) Optical devices : Waveguides
(310.2785) Thin films : Guided wave applications
(160.4236) Materials : Nanomaterials
(280.4788) Remote sensing and sensors : Optical sensing and sensors

ToC Category:

Original Manuscript: May 20, 2010
Revised Manuscript: June 12, 2010
Manuscript Accepted: June 13, 2010
Published: July 9, 2010

Virtual Issues
Vol. 5, Iss. 12 Virtual Journal for Biomedical Optics

Makoto Fujimaki, Ken-ichi Nomura, Kazuki Sato, Takafumi Kato, Subash C.B. Gopinath, Xiaomin Wang, Koichi Awazu, and Yoshimichi Ohki, "Detection of colored nanomaterials using evanescent field-based waveguide sensors," Opt. Express 18, 15732-15740 (2010)

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