28 June 2013 Study of photonic crystal cavity sensor integrated with microfluidic channel in the visible region
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Abstract
In this work, we present the optical characterization of a two-dimensional (2D) L3 photonic crystal (PhC) cavity biosensor in visible region by using 3D Finite Difference Time Domain (FDTD) method. The sensor is based on GaN material and integrated with a microfluidic channel. Sensing is performed by measuring the wavelength shift of the PhC cavity resonant peak, whose spectral position is sensitive to refractive index changes of dielectric material inside microfluidic channel. We simulate the PhC cavity with water (n=1.33) and two immersion oils (n=1.48 and n=1.518) overlaid. Spectral peak width was found to be 9.8nm around 650nm. A spectral shift of peak wavelength with index change of 35nm/RIU was observed. Measured peak shift (Δλ = 6.5nm) corresponds to a detectable index change Δn = 0.188.
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Lei Zhang, Tun Cao, Zhi Gang Li, Kai Rong Qin, Wei Ping Yan, "Study of photonic crystal cavity sensor integrated with microfluidic channel in the visible region", Proc. SPIE 8561, Advanced Sensor Systems and Applications V, 85610A (28 June 2013); doi: 10.1117/12.999548; https://doi.org/10.1117/12.999548
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