Sensitivity optimization of injection-molded photonic crystal slabs for biosensing applications

For label-free assays employing photonic crystal slabs (PCSs), the sensitivity is one of the most important properties influencing the detection limit. We investigate the bulk sensitivity and the surface sensitivity of 24 different PCSs fabricated by injection molding of PMMA and subsequent sputteri...

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Veröffentlicht in:Optical materials express 2013-05, Vol.3 (5), p.556-565
Hauptverfasser: Nazirizadeh, Yousef, von Oertzen, Florian, Plewa, Klaus, Barié, Nicole, Jakobs, Peter-Jürgen, Guttmann, Markus, Leiste, Harald, Gerken, Martina
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container_issue 5
container_start_page 556
container_title Optical materials express
container_volume 3
creator Nazirizadeh, Yousef
von Oertzen, Florian
Plewa, Klaus
Barié, Nicole
Jakobs, Peter-Jürgen
Guttmann, Markus
Leiste, Harald
Gerken, Martina
description For label-free assays employing photonic crystal slabs (PCSs), the sensitivity is one of the most important properties influencing the detection limit. We investigate the bulk sensitivity and the surface sensitivity of 24 different PCSs fabricated by injection molding of PMMA and subsequent sputtering of a Ta sub(2)O sub(5) high-index layer. The duty cycle of the linear grating is varied in steps of 0.1 between 0.2 and 0.7. Four different Ta sub(2)O sub(5) layer thicknesses (89 nm, 99 nm, 189 nm, 301 nm) are deposited. Both bulk and surface sensitivity are optimal for a Ta sub(2)O sub(5) layer thickness of99nm. The maximum bulk sensitivity of 138nm/RIU is achieved fora duty cycle of 0.7, while the maximum surface sensitivity of 47 nm/RIU is obtained fora duty cycle of 0.5. Good agreement between experimental results and finite-difference time-domain (FDTD) simulations is observed. The PCSs sensitivity is linked to the mode intensity distribution.
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title Sensitivity optimization of injection-molded photonic crystal slabs for biosensing applications
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