Reflectance-based two-dimensional TiO_2 photonic crystal liquid sensors | Zendy

Yujian Huang | Zendy; G. Pandraud | Zendy; P.M. Sarro | Zendy

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Reflectance-based two-dimensional TiO_2 photonic crystal liquid sensors

Author(s) -

Yujian Huang,

G. Pandraud,

P.M. Sarro

Publication year - 2012

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.37.003162

Subject(s) - nanopillar , materials science , optics , reflectivity , refractive index , wavelength , photonic crystal , optoelectronics , signal (programming language) , photonics , nanotechnology , physics , nanostructure , computer science , programming language

We propose and experimentally demonstrate a reflectance-based photonic crystal (PC) liquid sensor. The PC is made of two-dimensional TiO2 nanopillar arrays. Such a reflectance-based structure with large functional area not only simplifies the optical guiding but also enhances the sensor signal. A linear shift of reflectance peaks is found for liquids with refractive indices varying from 1.333 to 1.390 at wavelength near 1.5 μm. Excellent agreement between measured values and the generated reflectance model at a fixed wavelength is obtained, indicating the high potential of these PC-based liquid sensors for biological and environmental applications.

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