KIP publications

year 2014
author(s) Christian Huck, Frank Neubrech, Jochen Vogt, Andrea Toma, David Gerbert, Julia Katzmann, Thomas Härtling, and Annemarie Pucci
title Surface-Enhanced Infrared Spectroscopy Using Nanometer-Sized Gaps
KIP-Nummer HD-KIP 14-15
KIP-Gruppe(n) F6
document type Paper
Keywords plasmonic, nanogaps, surface-enhanced infrared absorption, SEIRA, optical nanoantenna, infrared
source ACS Nano, Vol. 8, No. 5 (2014), pp 4908–4914
doi doi:10.1021/nn500903v
Abstract (en)

We report on the near-field coupling of individual gold nanoantennas arranged in tip-to-tip dimer configuration, leading to strong electromagnetic field enhancements in the infrared, which is of great interest for sensing applications such as surface-enhanced infrared spectroscopy. We quantitatively evaluated the enhancement of vibrational excitations of a 5 nm thick test layer of 4,4′-bis(N-carbazolyl)-1,1′-biphenyl as a function of different gap sizes. The dimers with the smallest gaps under investigation (~3 nm) lead to more than 1 order of magnitude higher signal enhancement with respect to gaps of 50 nm width. The comparison of experimental data and finite-difference time-domain simulations reveals a nonperfect filling of the gaps with sizes below 10 nm, which means that morphological information on the nanoscale is obtained additionally to chemical information.

  author   = {Huck, Christian and Neubrech, Frank and Vogt, Jochen and Toma, Andrea and Gerbert, David and Katzmann, Julia and H\"artling, Thomas and Pucci, Annemarie},
  title    = {Surface-Enhanced Infrared Spectroscopy Using Nanometer-Sized Gaps},
  journal  = {ACS Nano},
  year     = {2014},
  volume   = {8},
  number   = {5},
  pages    = {4908-4914},
  month    = {05},
  doi      = {10.1021/nn500903v},
  url      = {}
KIP - Bibliothek
Im Neuenheimer Feld 227
Raum 3.402
69120 Heidelberg