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Enhancing the quality factor of grating coupled plasmon resonance in optical recording media

Chakraborty, K and Kumawat, N and Sultana, Sabiha and Varma, MM (2016) Enhancing the quality factor of grating coupled plasmon resonance in optical recording media. In: SENSORS AND ACTUATORS A-PHYSICAL, 244 . pp. 50-55.

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Official URL: http://dx.doi.org/10.1016/j.sna.2016.04.025


Optical recording media such as Digital Video Discs (DVDs) or Blu-ray discs provide a readily available source for high quality 1D diffractive structures at the sub-wavelength scale in the visible spectrum. These are useful for several optical sensing methodologies such as Surface Plasmon Resonance (SPR) where the grating couples incident light into plasmon modes supported by the structure. The gratings available in these off-the-shelf devices are not optimized for SPR based sensing. Here we describe a simple method to improve the quality factor, an important performance metric of SPR based sensors, of optical recording media based plasmonic sensors. We reduced the linewidth of SPR response from a DVD based SPR sensor by an order of magnitude using a 100 nm thick polyelectrolyte multilayer film deposited using sequential layer by layer assembly from solutions. Numerical modeling and Atomic Force Microscopy studies established the origin of quality factor improvement from the change in the topography of the grating due to a polymer assembly. We demonstrate a limit of detection (LoD) of 7 x 10(-6) RIU using the modified DVD based grating coupled SPR sensor. (C) 2016 Elsevier B.V. All rights reserved.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the ELSEVIER SCIENCE SA, PO BOX 564, 1001 LAUSANNE, SWITZERLAND
Keywords: Grating coupled surface plasmon sensors; Optical recording media; Quality factor; Layer-by-layer assembly
Department/Centre: Division of Electrical Sciences > Electrical Communication Engineering
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 05 Jul 2016 06:20
Last Modified: 05 Jul 2016 06:20
URI: http://eprints.iisc.ac.in/id/eprint/54129

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