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Proceedings Paper

On the effect of broadband, multi-angular excitation and detection in guided-mode resonance biosensors
Author(s): Daniela Threm; Sabrina Jahns; Yousef Nazirizadeh; Martin Ziegler; Mirko Hansen; Hermann Kohlstedt; Jost Adam; Martina Gerken
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Paper Abstract

Guided mode resonance biosensors are of emerging interest as they allow integration on chip with fabrication on mass scale. The guided mode resonances (GMRs), observed in the transmission or reflection spectrum, are sensitive to refractive index changes in the vicinity of the photonic crystal (PhC) surface. Standard measurement setups utilize a collecting lens, focusing the extracted light intensity onto a single-point photo detector. In order to achieve highly miniaturized devices, we consider the integration of planar emitting and detector structures, such as organic light emitting diodes (OLEDs) and organic photo detectors (OPDs), together with the PhC based biosensors, on a single chip. This approach, however, consequently leads to a broadband, multi-angular light excitation as well as to a broadband and multi-angular contribution to the OPD photon count. While GMR effects in PhC slabs with directional light sources have been widely studied, this lens-less scenario requires a deep understanding regarding the broadband and the angular influence of both incident and reflected or transmitted light. We performed finite-difference time-domain (FDTD) calculations for GMR effects in two-dimensional (2D) PhC slabs. We study the effects for broadband emission in the visible spectrum, together with an angular incident beam divergence of up to 80°. We verified the simulated results by performing angle-resolved spectral measurements with a light emitting diode (LED) in a macroscopic, lens-less setup. We further utilize this numerical setup to provide a deeper understanding of the modal behaviour of our proposed OLED and OPD-based integrated biosensor concept.

Paper Details

Date Published: 2 May 2014
PDF: 7 pages
Proc. SPIE 9127, Photonic Crystal Materials and Devices XI, 91270X (2 May 2014); doi: 10.1117/12.2051907
Show Author Affiliations
Daniela Threm, Christian-Albrechts-Univ. zu Kiel (Germany)
Sabrina Jahns, Christian-Albrechts-Univ. zu Kiel (Germany)
Yousef Nazirizadeh, Christian-Albrechts-Univ. zu Kiel (Germany)
Martin Ziegler, Christian-Albrechts-Univ. zu Kiel (Germany)
Mirko Hansen, Christian-Albrechts-Univ. zu Kiel (Germany)
Hermann Kohlstedt, Christian-Albrechts-Univ. zu Kiel (Germany)
Jost Adam, Christian-Albrechts-Univ. zu Kiel (Germany)
Martina Gerken, Christian-Albrechts-Univ. zu Kiel (Germany)

Published in SPIE Proceedings Vol. 9127:
Photonic Crystal Materials and Devices XI
Sergei G. Romanov; Gabriel Lozano; Dario Gerace; Christelle Monat; Hernán Ruy Míguez, Editor(s)

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