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Ultrasmall metal-insulator-metal nanoresonators: impact of slow-wave effects on the quality factor

Jianji Yang 1 Christophe Sauvan 2 Anthony Jouanin 1 Stéphane Collin 3 Jean-Luc Pelouard 3 Philippe Lalanne 2 
1 Laboratoire Charles Fabry / Naphel
LCF - Laboratoire Charles Fabry
2 lp2n-03,lp2n-13
LP2N - Laboratoire Photonique, Numérique et Nanosciences
Abstract : We study the quality factor variation of three dimensional Metal-Insulator-Metal nanoresonators when their volume is shrunk from the diffraction limit (λ /2n)3 down to a deep subwavelength scale (λ /50)3. In addition to rigorous fully-vectorial calculations, we provide a semianalytical expression of the quality factor Q obtained with a Fabry-Perot model. The latter quantitatively predicts the absorption and radiation losses of the nanoresonator and provides an in-depth understanding of the mode lifetime that cannot be obtained with brute-force computations. In particular, it highlights the impact of slow-wave effects on the Q-factor as the size of the resonator is decreased. The Fabry-Perot model also evidences that, unexpectedly, wave retardation effects are present in metallic nanoparticles, even for deep subwavelength dimensions in the quasi-static regime.
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Submitted on : Wednesday, April 10, 2013 - 7:15:44 PM
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  • HAL Id : hal-00811646, version 1



Jianji Yang, Christophe Sauvan, Anthony Jouanin, Stéphane Collin, Jean-Luc Pelouard, et al.. Ultrasmall metal-insulator-metal nanoresonators: impact of slow-wave effects on the quality factor. Optics Express, Optical Society of America - OSA Publishing, 2012, 20 (15), pp.16880-16891. ⟨hal-00811646⟩



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