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2015 ; 5
(ä): 10297
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Optical magnetic mirror metasurfaces using interference between Fabry-Pérot
cavity resonances in coaxial apertures
#MMPMID26020728
Rajasekharan R
; Roberts A
Sci Rep
2015[May]; 5
(ä): 10297
PMID26020728
show ga
Here we propose and computationally demonstrate a quasi-planar metasurface
consisting of arrays of pairs of concentric coaxial apertures in a metallic film.
The structure relies on destructive interference between Fabry-Pérot modes
excited in each aperture at resonance producing transmitted fields that interfere
destructively leading to suppressed transmission. Conversely, we show that in the
case of a perfect conductor, near-perfect, broadband reflection can be achieved
with zero phase change in the electric field and a variation of 2? on passing
through the coincident resonances. Extending the concept to shorter wavelengths,
we show that mirrors exhibiting close to a 2? phase excursion, albeit with a
reduction in the amplitude reflection coefficient at resonance and a lower Q, can
be also achieved. Structures such as these can be used to enhance light-matter
interactions at surfaces and act as high impedance ground planes for antenna
applications.