All dielectric metasurfaces are attracting great attention for their potential to control light reflection and transmission at the nanoscale. Here, we make use of a coupled electric/magnetic dipole formulation for a periodic array of high-refractive-index cylinders to analytically explore the emergence of Fano resonances for both s- and p-polarized waves. Strong Fano resonances with large Q-factors are found in Si nanocylinder metasurfaces as a result of the lattice-induced interplay between electric and magnetic dipole resonances, where the narrow resonances are connected to bound states in the continuum supported by the lattice. The impact on the refractive index of the surrounding medium is analyzed, revealing that such simple all dielectric metasurfaces are suitable for refractive-index sensing devices with figures of merit of two orders of magnitude.
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14 May 2019
Research Article|
May 13 2019
Narrow Fano resonances in Si nanocylinder metasurfaces: Refractive index sensing
Special Collection:
Dielectric Nanoresonators and Metamaterials
Diego R. Abujetas
;
Diego R. Abujetas
a)
1
Instituto de Estructura de la Materia (IEM-CSIC), Consejo Superior de Investigaciones Científicas
, Serrano 121, 28006 Madrid, Spain
2
Donostia International Physics Center DIPC
, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
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Juan J. Sáenz
;
Juan J. Sáenz
b)
2
Donostia International Physics Center DIPC
, Paseo Manuel de Lardizabal 4, 20018 Donostia-San Sebastián, Spain
3
IKERBASQUE, Basque Foundation for Science
, 48013 Bilbao, Basque Country, Spain
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José A. Sánchez-Gil
José A. Sánchez-Gil
c)
1
Instituto de Estructura de la Materia (IEM-CSIC), Consejo Superior de Investigaciones Científicas
, Serrano 121, 28006 Madrid, Spain
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a)
Electronic mail: diego.romero@iem.cfmac.csic.es
b)
Electronic mail: juanjo.saenz@dipc.org
c)
Electronic mail: j.sanchez@csic.es
Note: This paper is part of the Special Topic on Dielectric Nanoresonators and Metamaterials.
J. Appl. Phys. 125, 183103 (2019)
Article history
Received:
March 01 2019
Accepted:
April 22 2019
Citation
Diego R. Abujetas, Juan J. Sáenz, José A. Sánchez-Gil; Narrow Fano resonances in Si nanocylinder metasurfaces: Refractive index sensing. J. Appl. Phys. 14 May 2019; 125 (18): 183103. https://doi.org/10.1063/1.5094417
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