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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 9 — Apr. 26, 2010
  • pp: 9561–9569

A multi-functional plasmonic biosensor

Yun-Tzu Chang, Yueh-Chun Lai, Chung-Tien Li, Cheng-Kuang Chen, and Ta-Jen Yen  »View Author Affiliations

Optics Express, Vol. 18, Issue 9, pp. 9561-9569 (2010)

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We present a coupler-free, multi-mode refractive index sensor based on nanostructured split ring resonators (SRRs). The fabricated SRR structures exhibit multiple reflectance peaks, whose spectral positions are sensitive to local dielectric environment and can be quantitatively described by our standing-wave plasmonic resonance model, providing a design rule for this multi-mode refractive-index (MMRI) sensor. We further manifest that the lower-order modes possess greater sensitivity associated with stronger localized electromagnetic field leading to shorter detection lengths within five hundreds nanometers, while the higher-order modes present mediate sensitivity with micron-scale detection lengths to allow intracellular bio-events detection. These unique merits enable the SRR-based sensor a multi-functional biosensor and a potential label-free imaging device.

© 2010 OSA

OCIS Codes
(130.6010) Integrated optics : Sensors
(260.5740) Physical optics : Resonance
(160.3918) Materials : Metamaterials

ToC Category:

Original Manuscript: March 19, 2010
Revised Manuscript: April 14, 2010
Manuscript Accepted: April 14, 2010
Published: April 22, 2010

Virtual Issues
Vol. 5, Iss. 9 Virtual Journal for Biomedical Optics

Yun-Tzu Chang, Yueh-Chun Lai, Chung-Tien Li, Cheng-Kuang Chen, and Ta-Jen Yen, "A multi-functional plasmonic biosensor," Opt. Express 18, 9561-9569 (2010)

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