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van Gulik, R.J.J. (author), de Boer, B.M. (author), Harmsma, P.J. (author)In this paper, we compare ring resonator and three-port Mach-Zehnder Interferometer (MZI) devices fabricated on silicon-on-insulator for the purpose of refractive index sensing. Their respective sensitivities and limits of detection (LOD) were determined with NaCl solutions. A sensitivity of 113.07 nm per refractive index unit (RIU) and LOD of 2...article 2017
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Ullien, D. (author), Harmsma, P.J. (author), Chakkalakkal Abdulla, S.M.C. (author), de Boer, B.M. (author), Bosma, D. (author), Sudhölter, E.J.R. (author), de Smet, L.C.P.M. (author), Jager, W.F. (author)Silicon optical microring resonators (MRRs) are sensitive devices that can be used for biosensing. We present a novel biosensing platform based on the application of polyelectrolyte (PE) layers on such MRRs. The top PE layer was covalently labeled with biotin to ensure binding sites for antibodies via a streptavidin-biotin binding scheme....article 2014
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Chakkalakkal Abdulla, S.M.C. (author), de Boer, B.M. (author), Pozo Torres, J.M. (author), van den Berg, J.H. (author), Abutan, A.E. (author), Hagen, R.A.J. (author), Lo Cascio, D.M.R. (author), Harmsma, P.J. (author)This article presents work on a Silicon-On-Insulator (SOI) compact sensing platform based on Micro Ring Resonators (MRRs). In order to enable correction for variations in environmental conditions (temperature, mechanical stress etc), a study has been performed on the performance of uncoated sensing MRRs, and of SU8- and SiO2-covered reference...conference paper 2014
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Doelman, N.J. (author), van den Braber, R. (author), Kasparek, W. (author), Erckmann, V. (author), Bongers, W. (author), Stober, J. (author), Fritz, E. (author), Dekker, B. (author), Krijger, B. (author), Hollmann, F. (author), Michel, G. (author), Noke, F. (author), Purps, F. (author), Maraschek, M. (author), Monaco, F. (author), Müller, S. (author), Schütz, H. (author), Wagner, D. (author)An adaptive mirror control strategy for tuning an optical resonator is described. The control approach is modelfree and uses a small-amplitude perturbation signal to enable real-time estimation of the cost function gradient. The strategy has similarities with the approaches of 'stochastic approximation' and 'extremum seeking control', which are...conference paper 2013
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Westerveld, W.J. (author), Harmsma, P.J. (author), Schmits, R. (author), Tabak, E. (author), Pozo Torres, J.M. (author), Urbach, H.P. (author), Yousefi, M. (author)Silicon-on-insulator (SOI) technology has become one of the focus platforms for photonic integrated circuits (PICs). The CMOS technology opens the possibility for reliable mass fabrication of cost-effective photonic circuits. Recently there has been a growing interest in direct optical sensing of, for example, temperature, pressure or strain,...conference paper 2011