X-shaped plasmonic antenna on a quantum cascade laser

Austin, D.; Mullin, N.; Luxmoore, I.; Sandall, I. C.; Cullis, A. G.; Bismuto, A.; Faist, J.; Hobbs, J. K.; Wilson, L. R.
April 2010
Applied Physics Letters;4/12/2010, Vol. 96 Issue 15, p151105
Academic Journal
We report an x-shaped plasmonic antenna design patterned onto the gold coated facet of a mid-infrared quantum cascade laser. Using apertureless scanning near-field optical microscopy we measure a single enhanced region in the optical near-field at the center of the x-antenna, with a full-width-at-half-maximum of ∼100 nm for the operating wavelength of ∼8.8 μm. This design provides complete suppression of near-field signal away from the center, with concomitant improvements in imaging contrast expected. Our experimental results are also in good agreement with finite difference time domain simulations, which show a full-width-at-half-maximum of ∼80 nm.


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