Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 90: Sensing, Active Structures and other Applications
O 90.12: Talk
Thursday, March 19, 2015, 17:45–18:00, MA 144
Strip Gratings for Surface Enhanced Infrared Absorption Spectroscopy (SEIRAS) — •Tobias Maß1, Tao Wang1, Vu Hoa Nguyen2, Uwe Schnakenberg2, and Thomas Taubner2,3 — 1I. Institute of Physics (IA), RWTH Aachen University — 2Institute of Materials and Electrical Engineering I, RWTH Aachen University — 3Fraunhofer Institute for Laser Technology (ILT)
Metallic nanoantennas efficiently couple light into a region of subwavelength size. Antenna arrays designed for surface enhanced infrared absorption spectroscopy (SEIRA) enable the detection of molecular vibration with high sensitivity [1-3]. In a previous publication we demonstrated the spectral tuning of gold strip grating resonances by changing the period and demonstrated significant enhancement of a PMMA absorption band [4]. In this contribution, the spectral response as well as the local near field enhancement of the gratings are analysed via FTIR spectroscopy and FDTD simulations, respectively. Especially the dependence of local field enhancement on the strip width of the gratings as well as the influence of different incident angles is investigated.
[1] Adato et al. PNAS 2009 106(46), 19227-19232
[2] K. Chen et al. ACS Nano 2012 6, 7998-8006
[3] Neubrech et al. Phys. Rev. Lett. 2008 101, 157403
[4] Wang et al. Opt. Express 2013 21(7), 9005-9010