A microfluidic refractive index sensor based on an integrated three-dimensional photonic crystal

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Title: A microfluidic refractive index sensor based on an integrated three-dimensional photonic crystal
Author(s): Wu, Jing; Day, Daniel; Gu, Min
Abstract: We present the concept of using three-dimensional photonic crystals for refractive index sensing in a microfluidic channel. The sensors are based on a three-dimensional void channel photonic crystal fabricated by femtosecond laser writing in a polymer substrate. It is demonstrated that a change in the refractive index of the fluid in the microchannel results in a shift in the band gap or band gap defect position of the photonic crystal. According to Fourier transform infared spectroscopy of the photonic crystal sensor, a change of 6×10−3 in the refractive index of the fluid can be detected.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics
Source: Applied Physics Letters, Vol. 92, no. 7 (2008), Article 071108
Publication year: 2008
Keyword(s): Fourier transform spectra; High-speed optical techniques; Infrared spectra; Integrated optics; Microfluidics; Microsensors; Photonic band gap; Photonic crystals; Refractive index
Publisher: American Institute of Physics
ISSN: 0003-6951
Publisher URL: http://dx.doi.org/10.1063/1.2840700
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