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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 47: Electrical, Dielectrical and Optical Properties of Thin Films II
CPP 47.3: Talk
Wednesday, March 14, 2018, 12:30–12:45, C 230
Ultra-sensitive guided-mode resonance refractive index sensor — •Swagato Sarkar1, Tobias A. F. König2,3, Andreas Fery2,3,4, and Joby Joseph1 — 1Dept. of Physics, Indian Institute of Technology Delhi, New Delhi, India-110016 — 2Leibniz-Institut für Polymerforschung Dresden e.V., Institute of Physical Chemistry and Polymer Physics, Hohe Str. 6, 01069 Dresden, Germany — 3Cluster of Excellence Centre for Advancing Electronics Dresden, Technische Universität Dresden, 01062 Dresden, Germany — 4Department of Physical Chemistry of Polymeric Materials, Technische Universität Dresden, Hohe Str. 6, 01069 Dresden, Germany
In this work, an extremely sensitive refractive index (RI) sensor employing phase detection in a guided mode resonance (GMR) structure is presented where the GMR structure is introduced to one of the arms of a Mach-Zehnder Interferometer to detect RI change through phase measurement via fringe shift. The sensitivity comes out to be 0.608π phase shift per 10−4 RI change in water medium which is more than 100 times higher than the other reported GMR based phase detection method. Using the experimental set up, a minimum phase shift of (1.94 x 10−3) π can be measured that corresponds to a RI change of 3.43 x 10−7, outperforming the sensitivity of any of the reported optical sensors. Finally, an alternative lithography free approach is considered using directed self-assembly method. Due to the high optical quality of the novel metal building blocks and the up-scalability of the self-assembly method, an outlook towards fabrication of cost efficient GMR ultra-sensitive refractive index sensor will be discussed.