Enhanced sensitivity in injection-molded guided-mode-resonance sensors via low-index cavity layers

We present an investigation on the use of low-index cavity layers to enhance the sensitivity of injection-molded guided-mode resonance (GMR) sensors. By adjusting the sputtering parameters, a low-index cavity layer is created at the interface between the waveguide layer and the substrate. Refractive...

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Bibliographic Details
Published inOptics express Vol. 23; no. 11; pp. 14850 - 14859
Main Authors Ku, Yi-Fan, Li, Hsun-Yuan, Hsieh, Wen-Hsin, Chau, Lai-Kwan, Chang, Guo-En
Format Journal Article
LanguageEnglish
Published United States 01.06.2015
Subjects
Biosensing Techniques - instrumentation
Computer Simulation
Microscopy, Electron, Scanning
Numerical Analysis, Computer-Assisted
Optics and Photonics - instrumentation
Titanium - chemistry
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Summary:We present an investigation on the use of low-index cavity layers to enhance the sensitivity of injection-molded guided-mode resonance (GMR) sensors. By adjusting the sputtering parameters, a low-index cavity layer is created at the interface between the waveguide layer and the substrate. Refractive index measurements show that a sensitivity enhancement of up to 220% is achieved with a cavity layer, in comparison to a reference GMR sensor without a cavity layer. Finite-element-method simulations were performed, and the results indicate that the cavities significantly redistribute the resonance mode profile and thus enhances the sensitivity. The present investigation demonstrates a new method for enhancing the sensitivity of injection-molded GMR sensors for high-sensitivity label-free biosensing.
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content type line 23
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.23.014850