Boosting the figure-of-merit of LSPR-based refractive index sensing by phase-sensitive measurements

Nano Letters
Kristof LodewijksPol Van Dorpe

Abstract

Localized surface plasmon resonances possess very interesting properties for a wide variety of sensing applications. In many of the existing applications, only the intensity of the reflected or transmitted signals is taken into account, while the phase information is ignored. At the center frequency of a (localized) surface plasmon resonance, the electron cloud makes the transition between in- and out-of-phase oscillation with respect to the incident wave. Here we show that this information can experimentally be extracted by performing phase-sensitive measurements, which result in linewidths that are almost 1 order of magnitude smaller than those for intensity based measurements. As this phase change is an intrinsic property of a plasmon resonance, this opens up many possibilities for boosting the figure-of-merit (FOM) of refractive index sensing by taking into account the phase of the plasmon resonance. We experimentally investigated this for two model systems: randomly distributed gold nanodisks and gold nanorings on top of a continuous gold layer and a dielectric spacer and observed FOM values up to 8.3 and 16.5 for the respective nanoparticles.

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Citations

Dec 18, 2013·Analytica Chimica Acta·M-Carmen EstevezLaura M Lechuga
Jul 20, 2012·ACS Nano·Mikael Svedendahl, Mikael Käll
May 8, 2014·Sensors·Lianming TongHongxing Xu
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Aug 16, 2015·Biosensors & Bioelectronics·Antonio García MarínJose Luis Pau
Dec 22, 2015·Chemical Communications : Chem Comm·Yizhuo HeYiping Zhao
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May 15, 2015·Applied Optics·Kwang-Hyon KimMyong-Chol Bae
May 15, 2015·Optics Express·Guozhen LiChongjun Jin
Dec 17, 2019·Nanotechnology·Gavin E DonnellyFumin Huang
Jul 19, 2012·Chemical Communications : Chem Comm·Sabine Szunerits, Rabah Boukherroub
Feb 13, 2015·Nanoscale·Lauren M OttoNathan C Lindquist
Jan 16, 2020·Materials·Nuno M FigueiredoAlbano Cavaleiro
Oct 26, 2013·Nanophotonics·Andreas B DahlinSang-Hyun Oh
Apr 29, 2015·Nano Letters·Irina ZubritskayaAlexandre Dmitriev
Sep 27, 2019·Nano Letters·Sumant SarkarJohn G Gibbs
Dec 8, 2020··Nikolay A. GippiusSergey A. Dyakov

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