title: Refractive index sensing with Fano resonances in silicon oligomers.
abstract: We demonstrate experimentally refractive index sensing with localized Fano resonances in silicon oligomers, consisting of six disks surrounding a central one of slightly different diameter. Owing to the low absorption and narrow Fano-resonant spectral features appearing as a result of the interference of the modes of the outer and the central disks, we demonstrate refractive index sensitivity of more than 150 nm RIU-1with a figure of merit of 3.8.This article is part of the themed issue 'New horizons for nanophotonics'.
authors.affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.
authors.forename: Katie E
authors.initials: KE
authors.lastname: Chong
authors.affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.
authors.forename: Henry W
authors.initials: HW
authors.lastname: Orton
authors.affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.|Institute of Applied Physics, Abbe Center of Photonics, Friedrich Schiller University Jena, 07745 Jena, Germany.
authors.forename: Isabelle
authors.identifier: http://orcid.org/0000-0001-8021-572X
authors.initials: I
authors.lastname: Staude
authors.affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.
authors.forename: Manuel
authors.initials: M
authors.lastname: Decker
authors.affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.
authors.forename: Andrey E
authors.initials: AE
authors.lastname: Miroshnichenko
authors.affiliation: Center for Integrated Nanotechnologies, Sandia National Laboratories, Albuquerque, NM 87185, USA.
authors.forename: Igal
authors.initials: I
authors.lastname: Brener
authors.affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia.
authors.forename: Yuri S
authors.initials: YS
authors.lastname: Kivshar
authors.affiliation: Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 2601, Australia dragomir.neshev@anu.edu.au.
authors.forename: Dragomir N
authors.identifier: http://orcid.org/0000-0002-4508-8646
authors.initials: DN
authors.lastname: Neshev
keywords: Fano resonances; nanophotonic structures; oligomer; sensing