Invisibility Cloaking Scheme by Evanescent Fields Distortion on Composite Plasmonic Waveguides with Si Nano-Spacer

Abstract

A new, composite plasmonic waveguide based electromagnetic cloaking scheme is proposed with Si nano-spacer. Here we show, that the scattering fields of an object located on the cloak do not interact with the evanescent field, resulting in object’s invisibility. Finite difference time domain (FDTD) numerical calculations were performed to extract the modal distributions and surface intensities on a composite plasmonic waveguide with a metasurface overlayer. Spatially varying effective permittivity was analytically calculated using transformation optics. Cloaking was demonstrated for a cylindrical object with diameter of 70% from the waveguide width on a high index ridge waveguide structure with silicon nitride guiding layer on silica substrate. Our results open the door to new integrated photonic devices, harnessing from evanescent fields distortion on composite plasmonic waveguides and dielectric nano-spacers for the variety of applications from on-chip optical devices to all-optical processing.

On-chip nanophotonics and future challenges

“…One of the interesting implementations of metamaterials is an invisibility cloaking effect. Galutin et al showed that the invisibility cloaking effect can be demonstrated with waveguides when the metasurface overlayer affects the scattering fields of an object located on the cloak so they do not interact with the evanescent field, resulting in an object's invisibility [6]. The modal distribution and surface intensity in a channel photonic waveguide with a cloaking metasurface overlayer was studied for which the composite plasmonic waveguide structure is shown in Figure 8a.…”

“…On-chip nanophotonics is the emerging and rapidly growing branch of On-chip photonics in which the waveguides are either of nanoscale dimensions such as summarized in Ref. [2] or hybrid waveguides (composite waveguides) which are classical waveguides with nanoscale overlayers of slab film [3], nanoantennas [4,5] or metamaterial overlayers [6][7][8][9]. In addition, On-chip nanophotonics allows for the design, fabrication, and integration of several nanophotonic components on a common substrate utilizing guided-wave optics principles.…”

“…Incorporation of metamaterials into on-chip photonic devices can tune the performance of a waveguide, such as reducing waveguide facet reflection losses with antireflective structures [23,24], engineering the waveguide effective index to convert the propagating modes [25], and 'hiding carpet' cloaking an object on a chip [6]. Here, we overview the phenomena associated with the propagation and manipulation of light in dielectric waveguides, waveguides with plasmonic overlayer or metamaterials on waveguides.…”

Enhanced absorption in all-dielectric metasurfaces due to magnetic dipole excitation

“…In addition, dielectric materials are in high demand due to their possibility to concentrate the electric field without Joule losses 28,29 . The opportunity to control the light scattering can be widely applied to develop optical nanoantennas 30–33 , radiation sources 34–37 , antireflective coatings 38,39 , cloaking techniques 40 , to improve MRI devices 41,42 , sensors 29 and many others. The multipole decomposition approach 43,44 is one of the widely-used methods to analyse the optical properties of dielectric metamaterials 12,45–49 .…”

Broadband forward scattering from dielectric cubic nanoantenna in lossless media

“…Nanoparticles scatter light and support the excitation of the geometrical (Mie) electric and magnetic multipolar resonances [2][3][4][5][6][7][8] which in turn enhance light-matter interaction. Despite the fact that the influence of nanoparticles size, geometry, and material on their optical properties is being extensively explored 3,9,10 for cloaking 11 and spectroscopy 12 , the influence of media in which the nanoparticles are embedded is still obscured. Here, therefore, we bridge this gap in knowledge by exploring the optical properties of high-index nanoparticles depending on the optical properties of a surrounding medium.…”