Journal
OPTICS EXPRESS
Volume 13, Issue 24, Pages 9652-9659Publisher
OPTICAL SOC AMER
DOI: 10.1364/OPEX.13.009652
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We discuss how light can be efficiently bent by nanoscale-width slit waveguides in metals. The discussion is based on accurate numerical solutions of Maxwell's equations. Our results, using a realistic model for silver at optical wavelengths, show that good right-angle bending transmission can be achieved for wavelengths lambda > 600 nm. An approximate stop-band at lower wavelengths also occurs, which can be partly understood in terms of a dispersion curve analysis. The bending efficiency is shown to correlate with a focusing effect at the inner bend corner. Finally, we show that good bending transmission can even arise out of U-turn structures. (c) 2005 Optical Society of America.
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