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2016 ; 6
(ä): 23149
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Plasmofluidic Disk Resonators
#MMPMID26979929
Kwon MS
; Ku B
; Kim Y
Sci Rep
2016[Mar]; 6
(ä): 23149
PMID26979929
show ga
Waveguide-coupled silicon ring or disk resonators have been used for optical
signal processing and sensing. Large-scale integration of optical devices demands
continuous reduction in their footprints, and ultimately they need to be replaced
by silicon-based plasmonic resonators. However, few waveguide-coupled
silicon-based plasmonic resonators have been realized until now. Moreover, fluid
cannot interact effectively with them since their resonance modes are strongly
confined in solid regions. To solve this problem, this paper reports realized
plasmofluidic disk resonators (PDRs). The PDR consists of a submicrometer radius
silicon disk and metal laterally surrounding the disk with a 30-nm-wide channel
in between. The channel is filled with fluid, and the resonance mode of the PDR
is strongly confined in the fluid. The PDR coupled to a
metal-insulator-silicon-insulator-metal waveguide is implemented by using
standard complementary metal oxide semiconductor technology. If the refractive
index of the fluid increases by 0.141, the transmission spectrum of the waveguide
coupled to the PDR of radius 0.9 ?m red-shifts by 30 nm. The PDR can be used as a
refractive index sensor requiring a very small amount of analyte. Plus, the PDR
filled with liquid crystal may be an ultracompact intensity modulator which is
effectively controlled by small driving voltage.