Journal
OPTICS EXPRESS
Volume 18, Issue 15, Pages 15732-15740Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.015732
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- New Energy and Industrial Technology Development Organization, Japan (NEDO)
- Ministry of Education, Culture, Sports, Science and Technology, Japan (MEXT)
- Japan Society for the Promotion of Science (JSPS)
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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. (C) 2010 Optical Society of America
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