Journal
OPTICS EXPRESS
Volume 18, Issue 13, Pages 13337-13344Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.013337
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Funding
- National Natural Science Foundation of China (NNSFC) [60736041, 10874238]
- National Key Basic Research Special Foundation of China [2006CB302901]
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Optical bistability at nanoscale is a promising way to realize optical switching, a key component of integrated nanophotonic devices. In this work we present an analytical model for optical bistability in a metal nano-antenna involving Kerr nonlinear medium based on detailed analysis of the correlation between the incident and extinction light intensity under surface plasmon resonance (SPR). The model allows one to construct a clear picture on how the threshold, contrast, and other characteristics of optical bistability are influenced by the nonlinear coefficient, incident light intensity, local field enhancement factor, SPR peak width, and other physical parameters of the nano-antenna. It shows that the key towards low threshold power and high contrast optical bistability in the nanosystem is to reduce the SPR peak width. This can be achieved by reducing the absorption of metal materials or introducing gain media into nanosystems. (C) 2010 Optical Society of America
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