Journal
OPTICS EXPRESS
Volume 20, Issue 15, Pages 16880-16891Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.20.016880
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- Saint Gobain Recherche
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We study the quality factor variation of three-dimensional Metal-Insulator-Metal nanoresonators when their volume is shrunk from the diffraction limit (lambda/2n)(3) down to a deep subwavelength scale (lambda/50)(3). In addition to rigorous fully-vectorial calculations, we provide a semi-analytical 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. (C) 2012 Optical Society of America
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