Circularly polarized nanoring antenna for uniform overheating applications

A nanoring antenna is introduced for the first time in this article. This nantenna is made by etching a slot ring in a nanogold plate. The proposed nantenna can be easily tuned for operation at any wavelength of interest by varying the diameter of its ring. The proposed nantenna has a pair of hot-spots that are aligned opposite to each other along a line passing through the center of the nanoring. The electric field intensity enhancement at the hot-spots of the proposed nantenna is more than 2000 with a full-width at half-maximum of about 900 nm centered around 2500 nm wavelength. If excited with circularly polarized plane wave, the hot-spots pair is rotating with time. This unique feature of the new nanoring makes it very attractive for cancer tumor overheating, as it allows for more uniform distribution of the concentrated heat than any other nantenna with fixed hot-spot location. The proposed nantenna is thoroughly analyzed by means of two well-known 3D electromagnetic solvers that agree very well with each other. The effect of varying the substrate refractive index below the nantenna is also investigated. Copyright © 2012 Wiley Periodicals, Inc

Wideband nanocrescent plasmonic antenna with engineered spectral response

A novel nantenna is presented in this article. It is formed by locating a gold circular patch inside a circular aperture etched from a gold plate. The centers of the two objects are shifted from each other, which results in having a crescent-shaped aperture. Each of the circular patch and aperture has its own resonance wavelength whose location can be controlled by varying the corresponding diameter. It has been demonstrated that the working bands around these two resonances can be made slightly overlapping at their inner edges. This results in a remarkably wideband behavior characterized by a full-width half-maximum of more than 2000 nm centered around 2500 nm, which is equivalent to more than 80% fractional bandwidth. The proposed nantenna with 20-nm gap width is capable of providing maximum electric field intensity enhancement of about 3000. It can confine the incident radiation within a volume well below the diffraction limit. © 2012 Wiley Periodicals, Inc

Novel Integrated Antenna Array for Automotive Radars Operating at 77 GHz

[abstract not available

Surface-bulk micromachined on-chip monopole antenna for 77 GHz automotive radar applications

[abstract not available

Integral Equation Formulation for Planar Plasmonic Structures with Finite Thickness in Layered Media

A detailed Volume Integral Equation (VIE) formulation for planar plasmonic nano structures with finite thickness in flat multi-layers medium is presented. The boundary condition along the localized metallic objects is expressed in terms of the unknown polarization current flowing through these objects in the form of an integral equation, which is solved using the Method of Moments (MoM). The Green\u27s functions associated with a layered medium of practical importance are expressed in the spectral domain. The corresponding spatial domain Green\u27s functions are obtained using the Discrete Complex Images Method (DCIM). Special treatment for the spectral function\u27s asymptote at high spectral values is performed. The presented formulation is applied on different plasmonic structures immersed inside layered media. The structures include nano-rod and nano-patch excited by an incident plane wave. In addition, a simple band-stop filter based on quarter-wavelength stubs is considered. This filter is fed with a couple of plasmonic transmission lines. The obtained current distributions and S -parameters are compared with those obtained using a commercial full-wave electromagnetic simulator, namely CST Microwave Studio. A very good agreement is observed. The proposed integral equation formulation enjoys high degree of stability, numerical efficiency, and accuracy

Reconfigurable micromachined antenna with polarization diversity for mm-wave applications

[abstract not available

Integral Equation Formulation for Planar Plasmonic Nano Structures in Layered Media

[abstract not available]https://fount.aucegypt.edu/faculty_book_chapters/1353/thumbnail.jp