Abstract
We present a design for tunable directional beaming through a subwavelength
metallic double slit surrounded by dielectric surface-relief gratings. On-axis and
off-axis beaming can be switched by controlling the incident angle to asymmetrically
excite surface plasmon polaritons (SPPs) that are subsequently coupled out to
propagating beams by the two gratings on the left and the right sides of the double
slit. Furthermore, the division of optical power into two off-axis beaming
directions can be tuned smoothly by varying the incident angle while keeping the
total power almost unchanged. The mechanism of this effect is analyzed theoretically
and verified using rigorous numerical simulations.
© 2012 Chinese Optics Letters
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