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

Yi-Fan Ku | Zendy; Hsun-Yuan Li | Zendy; WenHsin Hsieh | Zendy; LaiKwan Chau | Zendy; GuoEn Chang | Zendy

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

Author(s) -

Yi-Fan Ku,

Hsun-Yuan Li,

WenHsin Hsieh,

LaiKwan Chau,

GuoEn Chang

Publication year - 2015

Publication title -

optics express

Language(s) - Uncategorized

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.014850

Subject(s) - materials science , sensitivity (control systems) , refractive index , layer (electronics) , optics , optoelectronics , resonance (particle physics) , guided mode resonance , biosensor , substrate (aquarium) , waveguide , electronic engineering , composite material , nanotechnology , wavelength , oceanography , physics , particle physics , geology , engineering , diffraction grating

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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