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Refractive Index Sensor Based on a 1D Photonic Crystal in a Microfluidic Channel
Department of Micro and Nanotechnology, Technical University of Denmark, DTU Nanotech, Building 345 East, DK-2800 Kongens Lyngby, Denmark
Department of Photonics Engineering, Technical University of Denmark, DTU Fotonik, Building 345 West, DK-2800 Kongens Lyngby, Denmark
* Author to whom correspondence should be addressed.
Received: 27 January 2010; in revised form: 10 February 2010 / Accepted: 5 March 2010 / Published: 22 March 2010
Abstract: A refractive index sensor has been fabricated in silicon oxynitride by standard UV lithography and dry etching processes. The refractive index sensor consists of a 1D photonic crystal (PhC) embedded in a microfluidic channel addressed by fiber-terminated planar waveguides. Experimental demonstrations performed with several ethanol solutions ranging from a purity of 96.00% (n = 1.36356) to 95.04% (n = 1.36377) yielded a sensitivity (Δλ/Δn) of 836 nm/RIU and a limit of detection (LOD) of 6 x 10-5 RIU, which is, however, still one order of magnitude higher than the theoretical lower limit of the limit of detection 1.3 x 10–6 RIU.
Keywords: 1D photonic crystal; refractive index sensor; integrated waveguides; electrochromatography
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MDPI and ACS Style
Nunes, P.S.; Mortensen, N.A.; Kutter, J.P.; Mogensen, K.B. Refractive Index Sensor Based on a 1D Photonic Crystal in a Microfluidic Channel. Sensors 2010, 10, 2348-2358.
Nunes PS, Mortensen NA, Kutter JP, Mogensen KB. Refractive Index Sensor Based on a 1D Photonic Crystal in a Microfluidic Channel. Sensors. 2010; 10(3):2348-2358.
Nunes, Pedro S.; Mortensen, Niels Asger; Kutter, Jörg P.; Mogensen, Klaus B. 2010. "Refractive Index Sensor Based on a 1D Photonic Crystal in a Microfluidic Channel." Sensors 10, no. 3: 2348-2358.