Bowtie-shaped nanoaperture: a modal study | Zendy

Abdoulkader Ibrahim Idriss | Zendy; Mathieu Mivelle | Zendy; Thierry Grosjean | Zendy; J.-T. Allegre | Zendy; Geoffrey W. Burr | Zendy; Fadi Baida | Zendy

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Bowtie-shaped nanoaperture: a modal study

Author(s) -

Abdoulkader Ibrahim Idriss,

Mathieu Mivelle,

Thierry Grosjean,

J.-T. Allegre,

Geoffrey W. Burr,

Fadi Baida

Publication year - 2010

Publication title -

optics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.524

H-Index - 272

eISSN - 1071-2763

pISSN - 0146-9592

DOI - 10.1364/ol.35.002448

Subject(s) - optics , finite difference time domain method , resonance (particle physics) , guided mode resonance , aperture (computer memory) , nanophotonics , wavelength , surface plasmon resonance , plasmon , extraordinary optical transmission , physics , surface plasmon , materials science , surface plasmon polariton , diffraction grating , nanoparticle , nanotechnology , particle physics , acoustics

Using the N-order finite-difference time-domain (FDTD) method, we show that optical resonances of the bowtie nanoaperture (BNA) are due to the combination of a guided mode inside the aperture and Fabry-Perot modes along the metal thickness. The resonance of lower energy, which leads to the well-known light confinement in the gap zone, occurs at the cutoff wavelength of the fundamental guided mode. No plasmon resonance is directly involved in the generation of the light hot spot. We also define a straightforward relationship between the resonance wavelengths of the BNA and its geometrical parameters. This brings a simple tool for the optimization of the BNA design.

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