Plasmonics

, Volume 11, Issue 6, pp 1427–1435

Substrate-Independent Lattice Plasmon Modes for High-Performance On-Chip Plasmonic Sensors

Article

DOI: 10.1007/s11468-016-0193-6

Cite this article as:
Lin, L. & Zheng, Y. Plasmonics (2016) 11: 1427. doi:10.1007/s11468-016-0193-6

Abstract

We systematically study the lattice plasmon resonance structures, which are known as core/shell SiO2/Au nanocylinder arrays (NCAs), for high-performance, on-chip plasmonic sensors using the substrate-independent lattice plasmon modes (LPMs). Our finite-difference time-domain simulations reveal that new modes of localized surface plasmon resonances (LSPRs) show up when the height-diameter aspect ratio of the NCAs is increased. The height-induced LSPRs couple with the superstrate diffraction orders to generate the substrate-independent LPMs. Moreover, we show that the high wavelength sensitivity and the narrow linewidth of the substrate-independent LPMs lead to the plasmonic sensors with high figure of merit (FOM) and high signal-to-noise ratio (SNR). In addition, the plasmonic sensors are robust in asymmetric environments for a wide range of working wavelengths. Our further study of both far- and near-field electromagnetic distribution in the NCAs confirms the height-enabled tunability of the plasmonic “hot spots” at the sub-nanoparticle resolution and the large field enhancement in the substrate-independent LPMs, which are responsible for the high FOM and SNR of the plasmonic sensors.

Keywords

Lattice plasmon modes Plasmonic sensors Spectral tunability Figure of merit Hot spots 

Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Department of Mechanical Engineering, Materials Science & Engineering Program, and Texas Materials InstituteThe University of Texas at AustinAustinUSA