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2017 ; 8
(ä): 15391
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Plasmonic computing of spatial differentiation
#MMPMID28524882
Zhu T
; Zhou Y
; Lou Y
; Ye H
; Qiu M
; Ruan Z
; Fan S
Nat Commun
2017[May]; 8
(ä): 15391
PMID28524882
show ga
Optical analog computing offers high-throughput low-power-consumption operation
for specialized computational tasks. Traditionally, optical analog computing in
the spatial domain uses a bulky system of lenses and filters. Recent developments
in metamaterials enable the miniaturization of such computing elements down to a
subwavelength scale. However, the required metamaterial consists of a complex
array of meta-atoms, and direct demonstration of image processing is challenging.
Here, we show that the interference effects associated with surface plasmon
excitations at a single metal-dielectric interface can perform spatial
differentiation. And we experimentally demonstrate edge detection of an image
without any Fourier lens. This work points to a simple yet powerful mechanism for
optical analog computing at the nanoscale.