Comprehensive analysis of photonic nanojets in 3D dielectric cuboids excited by surface plasmons
Fecha
2016Versión
Acceso abierto / Sarbide irekia
Tipo
Artículo / Artikulua
Versión
Versión aceptada / Onetsi den bertsioa
Impacto
|
10.1002/andp.201600098
Resumen
In this paper we study the excitation of photonic nanojets (PNJ) in 3D dielectric cuboids by surface plasmons at telecommunication wavelengths. The analysis is done using the effective refractive index approach. It is shown that the refractive index contrast between the regions with and without cuboid should be roughly less than 2 in order to generate jets at the output of the cuboid. The best pe ...
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In this paper we study the excitation of photonic nanojets (PNJ) in 3D dielectric cuboids by surface plasmons at telecommunication wavelengths. The analysis is done using the effective refractive index approach. It is shown that the refractive index contrast between the regions with and without cuboid should be roughly less than 2 in order to generate jets at the output of the cuboid. The best performance at λ0 = 1550 nm is obtained when the height of the cuboid is 160 nm producing a jet just at the output interface with a subwavelength resolution of 0.68λ0 and a high intensity enhancement (×5) at the focus. The multi‐wavelength response is also studied demonstrating that it is possible to use the proposed structure at different wavelengths. Finally, the backscattering enhancement is numerically evaluated by inserting a metal particle within the PNJ region, demonstrating a maximum value of ∼2.44 dB for a gold sphere of radius 0.1λ0. [--]
Materias
Photonic nanojets,
Telecom wavelengths,
Surface plasmons,
SPP
Editor
Wiley
Publicado en
Annalen der Physik, 2016, 528(9-10), 684-692
Departamento
Universidad Pública de Navarra/Nafarroako Unibertsitate Publikoa. Institute of Smart Cities - ISC
Versión del editor
Entidades Financiadoras
This work was supported by the Spanish Ministerio de Economía y Competitividad under contract TEC2014‐51902‐C2‐2‐R and partially was supported by the Mendeleev scientific fund of Tomsk State University № 8.2.48.2015. V.P.‐P. is sponsored by Spanish Ministerio de Educación, Cultura y Deporte under grant FPU AP‐2012‐3796. M.B. is sponsored by the Spanish Government via RYC‐2011‐08221.