Magnetoelectric fields: Probing the material chirality

Journal of Lasers, Optics & Photonics

ISSN: 2469-410X

Open Access

Magnetoelectric fields: Probing the material chirality

5th International Conference and Exhibition on Lasers, Optics & Photonics

November 28-30, 2016 Atlanta, USA

Eugene Kamenetskii

Ben Gurion University of the Negev, Israel

Posters & Accepted Abstracts: J Laser Opt Photonics

Abstract :

Probing the material chirality is of a fundamental interest in biology, chemistry, and metamaterial studies. The chiral asymmetry, in the rate of excitation of a small molecule, is proportional to the product of the chirality of the matter and the chirality of the electromagnetic (EM) field. Currently chiral plasmon polaritons draw much attention for creation twisted photons with enhanced chirality in the near fields. While, in optics, plasmon polaritons are coupled states of light with an electric dipole-carrying excitation, magnon polaritons in microwaves are coupled states of EM field with a magnetic dipole-carrying excitation. The measured forms of chiroptical intensity are inversely proportional to the wavelength of the probing radiation. That is why use of microwave radiation to detect chirality was considered as a non-solvable problem. During last several years, in the Microwave Magnetic Lab, BGU, we have been studing the effects of interaction of EM fields with magnetic-dipolar-mode (MDM) oscillations- chiral magnon polaritons observed in small ferrite disk particles. Our microwave-spectroscopy technique determines the rotational energy levels of chiral molecules with the aim to be applied for localized measuring of different biological liquids and biological tissue. Newly developed capabilities in microwave sensing using magnetoelectric (ME) probing fields originated from MDM resonators, provide a potential for unprecedented measurements of chemical and biological objects. ME fields are characterized by the helicity parameter which is a pseudoscalar. So the fields interacting with chiral molecules are distinguished by the same topological property. The shown ME-field sensing is addressed to microwave biomedical diagnostics and pathogen detection and to deepen our understanding of microwavebiosystem interactions. It can be also important for an analysis and design of microwave chiral metamaterials.

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