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Light focusing by slot Fabry–Perot photonic crystal nanoresonator on scanning tip

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Abstract

We numerically investigate the propagation of light through the photonic crystal (PhC) waveguide on low refraction index material for near-field light focusing at the visible wavelength (635nm) by incorporating a center air slot and Fabry–Perot resonator on the scanning tip. Perturbations by water and substrate refraction index changes of the PhC are analyzed by the finite-difference time-domain method to show minimal impact on light confinement and throughput. Such a total dielectric probe tip design has great potential to complement the current widely used metal-coated optical-fiber-based light confinement probe.

© 2011 Optical Society of America

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