Detection of colored nanomaterials using evanescent field-based waveguide sensors

被引：36

作者：

Fujimaki, Makoto ^{[1
]}

Nomura, Ken-ichi ^{[2
]}

Sato, Kazuki ^{[2
]}

Kato, Takafumi ^{[2
]}

Gopinath, Subash C. B. ^{[1
]}

Wang, Xiaomin ^{[1
,2
]}

Awazu, Koichi ^{[1
]}

Ohki, Yoshimichi ^{[2
]}

机构：

[1] Natl Inst Adv Ind Sci & Technol, Photon Res Inst, Tsukuba, Ibaraki 3058562, Japan

[2] Waseda Univ, Dept Elect Engn & Biosci, Shinjuku Ku, Tokyo 1698555, Japan

来源：

OPTICS EXPRESS | 2010年 / 18卷 / 15期

基金：

日本学术振兴会;

关键词：

SURFACE-PLASMON RESONANCE; X-RAY-DIFFRACTION; GAS-DETECTION; THIN-FILMS; SENSITIVITY; MICROSCOPE;

D O I：

10.1364/OE.18.015732

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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

引用

页码：15732 / 15740

页数：9

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