Photonic crystals in biology

Poster Session, Tuesday, June 15
Theme A1 - B702
The Interaction of Electromagnetic Waves from Single Sheet of Spherical Nano-Elements Meshed on
Spherical Shell
Taner Sengor
Department of Electronics and Communication Engineering, Yildiz Technical University, Istanbul 34349, Turkey
Abstract—Possibilities creating nano-structures providing unnatural electromagnetic characteristics are given. Co-rings in
nano-metric dimensions lying on different azimuth and/or equatorial planes are defined as nano-element providing such
possibilities. These nano-elements are meshed on spherical shells. The interaction of electromagnetic wave with both of
nano element and meshed spherical surface are studied. For an example, the necessary configurations for both of the
electromagnetically effective cloaking and the optically effective cloaking (invisibility) are given for this purpose.
The loops are used at meta-material applications,
frequently. The using of circular loop combinations on nonplanar
substrates is offered in this paper to consider in both of
artificial material studies and cloaking applications [1]. Two
basic combinations are used: i) Parallelly located circular loop
lying on latitude circles on a spherical core. We call this
element smooth ring ball. ii) Intersecting circular loop lying
on meridian circles on a spherical core. We call this element
cross ring ball. The circular loop is located on a spherical core
having the radius a, that is sufficiently small. The magnitudes
of the currents on the circular loops must be sufficiently large.
These necessary conditions give a chance to generate TM θ
waves, which we call principal wave. Additionally using of
materials having time independent permittivity and θ-
independent permeability brings the property of TE waves to
the previous TM θ waves. We call the last TM θ -TE waves
secondary wave. The arrangements at the circumstance of the
ring balls bring the property of TM r waves to the waves under
the discussion. The last property enforces to bring the
behavior of TE θ waves to the principal wave; therefore the
principal wave gains the property of TEM θ waves. The last
property enforces adding the behavior of TM waves to the
principal wave. So the wave under the discussion gains the
property of TEM waves. After all, the use of suitably built up
layers of almost zero epsilon material and/or perfectly
conducting material brings the behavior of TE r waves to the
waves under the discussion. The final wave is gained a
propagation characteristic fitting on the propagation
characteristics of TEM θ waves and almost TEM r waves.
The above said characteristic gives a way to produce
suitable objects with spherical shapes in nanometer scale;
those change the RCS of objects and therefore provide us to
built structures demonstrating effective electromagnetic
cloaking property. We call this structure effective
electromagnetic cloaking device.
In summary, several compositions of nano rings on
spherical substrates are studied. The necessary conditions for
both of the electromagnetically effective cloaking and the
optically effective cloaking are generated.
*Corresponding author: sengor@yildiz.edu.tr
[1] T. Sengor, " Properties of a non-planar metamaterial elements: ring
resonators on a spherical substrate, " The First International Congress on
Advanced Electromagnetic Materials in Microwaves and Optics, Italy,
Rome, Metamaterials 2007 Congress, 22-26 October 2007.
[2] T. Sengor, Metamaterials Congress, Aug 30th-Sept 4th 2009, London, UK
6th Nanoscience and Nanotechnology Conference, zmir, 2010 302