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Nanometer scale light focusing with high cavity-enhanced output

Marianne Consonni 1, 2 Jérôme Hazart 1 Gilles Lerondel 2 Alexandre Vial 2
1 CEA-LETI - Commissariat à l'énergie atomique et aux énergies alternatives - Laboratoire d'Electronique et de Technologie de l'Information
2 LNIO - Laboratoire de Nanotechnologie et d'Instrumentation Optique
ICD - Institut Charles Delaunay
Abstract : Efficient nanoscale optical focusing is demonstrated in double-structured thin metallic films supporting both surface plasmons and cavity eigenmodes. Numerical simulations show that efficient mode coupling can dramatically enhance the transmission of a subwavelength slit. For a spot size of ∼λ/10, the cavity induced enhancement is about an order of magnitude, leading to a final structure output (transmitted power/incident power) of ∼30%. Results are discussed in terms of cavity-slit mode matching and photon trapping within the cavity.
Keywords : Electromagnetism Plasmons Microscopy Gratings Transition metals Fluid mechanics Electrodynamics Dielectric properties Thin films Optical interference
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Submitted on : Wednesday, December 11, 2019 - 4:08:44 PM
Last modification on : Wednesday, September 15, 2021 - 3:03:33 PM

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Marianne Consonni, Jérôme Hazart, Gilles Lerondel, Alexandre Vial. Nanometer scale light focusing with high cavity-enhanced output. Journal of Applied Physics, American Institute of Physics, 2009, 105 (8), pp.084308. ⟨10.1063/1.3112003⟩. ⟨hal-02405060⟩

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