Negative Refractive Index Metasurfaces for Enhanced Biosensing
#MMPMID28879974
Jak?i? Z
; Vukovi? S
; Matovic J
; Tanaskovi? D
Materials (Basel)
2010[Dec]; 4
(1
): 1-36
PMID28879974
show ga
In this paper we review some metasurfaces with negative values of effective
refractive index, as scaffolds for a new generation of surface plasmon
polariton-based biological or chemical sensors. The electromagnetic properties of
a metasurface may be tuned by its full immersion into analyte, or by the
adsorption of a thin layer on it, both of which change its properties as a
plasmonic guide. We consider various simple forms of plasmonic crystals suitable
for this purpose. We start with the basic case of a freestanding,
electromagnetically symmetrical plasmonic slab and analyze different ultrathin,
multilayer structures, to finally consider some two-dimensional "wallpaper"
geometries like split ring resonator arrays and fishnet structures. A part of the
text is dedicated to the possibility of multifunctionalization where a
metasurface structure is simultaneously utilized both for sensing and for
selectivity enhancement. Finally we give an overview of surface-bound intrinsic
electromagnetic noise phenomena that limits the ultimate performance of a
metasurfaces sensor.
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