Abstract
Novel fabrication, detection and analysis approaches were employed to experimentally demonstrate scattering reduction by a plasmonic nanostructure operating at 1550 nm. The nanostructure consisted of a silicon nanorod surrounded by a plasmonic metamaterial cover comprised of eight gold nanowires and was fabricated by a combination of electron beam lithography, focused ion beam milling and dry and wet etching. The optical standing wave pattern of the device in the near-field was obtained using heterodyne near-field scanning optical microscopy. It was found that the spatial curvature of the interference fringes of the optical standing wave pattern was directly related to the scattering reduction of the device. The experiments were in excellent agreement with the theoretical predictions and suggested that the device reduced the scattering by 9.5 dB when compared to a bare silicon nanorod of diameter 240 nm and by 6 dB when compared to a bare silicon nanorod of diameter 160 nm.
Highlights
Recent advances in artificially structured materials and nanofabrication techniques have helped the scientific community realize a variety of invisibility cloaking devices designed using different techniques such as conformal mapping [1,2], quasi-conformal mapping [3,4,5,6], scattering cancellation [7,8], transmission line networks [9,10] and anomalous resonances [11,12]
If the scattering is dominated by the dipole component and the plasmonic cover is designed in such a way that the induced dipole moment exactly cancels that of dielectric core, there will be no scattering of light, rendering the object invisible to external observers
We present an experimental demonstration of scattering reduction by use of plasmonic cover at optical frequencies
Summary
Recent advances in artificially structured materials and nanofabrication techniques have helped the scientific community realize a variety of invisibility cloaking devices designed using different techniques such as conformal mapping [1,2], quasi-conformal mapping [3,4,5,6], scattering cancellation [7,8], transmission line networks [9,10] and anomalous resonances [11,12]. If the scattering is dominated by the dipole component and the plasmonic cover is designed in such a way that the induced dipole moment exactly cancels that of dielectric core, there will be no scattering of light, rendering the object invisible to external observers. In this regard, the plasmonic cover may be called an invisibility cloak, in this scheme the cloak design is highly dependent on the shape and dielectric properties of the object to be cloaked. The condition that the scattering is dominated by dipole moment requires that the entire structure is small compared to the wavelength
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