Accessible Nearfields by Nanoantennas on Nanopedestals for Ultrasensitive Vibrational Spectroscopy

A plasmonic nanoring antenna system on a nanopedestal, providing larger and more accessible local electromagnetic fields, enables higher surface-enhanced fluore­scence IR absorption (SEIRA) signals than conventional designs on dielectric substrates. Experimental results and finite difference time domain (FDTD) simulations demonstrate that such an improvement in the absorption signal of protein vibrational modes is directly proportional to the overlap between the optical fields and the biomolecules in the vicinity of the antenna. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.