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Mid-infrared direct coupling of surface-plasmon polaritons

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Abstract

We demonstrate a compact device for surface plasmon polariton (SPP) generation. A SPP mode is directly excited on a metal/air interface using a mid-infrared quantum cascade laser (QCL) with a dry etched facet. We demonstrate the SSP generation and propagation via mid-infrared imaging, using a metallic diffraction grating and a micro bolometer imaging camera to probe the SPP propagation. We also use an aperture-less near-field scanning microscope (a-SNOM) to directly observe the generated SPP.

© 2010 Optical Society of America

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