19 / 53
Laser Optics & Photonics and Atomic & Plasma Science 2018
J u l y 1 6 - 1 7 , 2 0 1 8
P r a g u e , C z e c h R e p u b l i c
Page 81
American Journal of Computer Science and Information Technology
ISSN: 2349-3917
E u r o S c i C o n J o i n t E v e n t o n
Laser Optics & Photonics and
Atomic & Plasma Science
A
large fraction of biological molecules are chiral, the chemistry of life is built almost exclusively on left-handed amino acids and
right-handed sugars, a phenomenon that is known as the homo chirality of life. Despite the importance of chiral molecules,
the experimental determination of enantiometric excess, the fraction of left- versus right-handed molecules within a mixture of
chiral molecules remains a tremendous challenge. Nowadays, localized measuring of chirality of biological and artificial-material
structures is mainly a prerogative of optics. In optics, chiral discrimination for biosensing and chiral-material characterization is
represented in a larger variety of effective tools. For biomedical diagnostics and pathogen detection, special plasmonic structures
with left- and right-handed optical superchiral fields have been recently proposed. These structures effectively interact with
large biomolecules, in particular, and chiral materials in general. Microwave techniques are attractive for biological applications
because of their sensitivity to water and dielectric contrast. Due to the growing interaction between biological sciences and
electrical engineering disciplines, effective microwave sensing and monitoring of biological samples is an important subject. It
becomes sufficiently apparent that in microwaves, the problem of effective chirality characterization of chemical and biological
objects can be solved when one develops sensing devices with microwave chiral probing fields. Can one use the main ideas
and results of the optical subwavelength chiral-field photonics to create microwave structures with subwavelength chiral-field
confinement? Since resonance frequencies of electrostatic (plasmon) oscillations in small particles are very far from microwave
frequencies, an answer to this question should be negative. Nevertheless, there exists another type of microwave structures,
which show strong subwavelength localization of electromagnetic energy and unique field topology. There are small ferrite
particles with magnetostatic-magnon oscillations. Recent studies in Microwave Magnetic Laboratory, BGU show that near fields
originated from small ferrite-disk particles with such oscillations are microwave twisted fields. The obtained microwave chiral-
field structures can provide unique insights for biomedical diagnostics and pathogen detection.
kmntsk@bgu.ac.alTwisted optical and microwave near fields for
probing chirality of biological structures
E O Kamenetskii
Ben Gurion University of the Negev, Israel
Am J Compt Sci Inform Technol 2018, Volume 6
DOI: 10.21767/2349-3917-C1-003