Isotropic magnetic metamaterials in the visible regime

Contacts:

Andrei Lavrinenko, DTU Fotonik, 4525-6392 (alav@fotonik.dtu.dk)

Radu Malureanu, DTU Fotonik, 4525-6377 (rmal@fotonik.dtu.dk)

”Magnetic colours” obtained using resonance metallic pads in the visible regime [1].

One of the main challenges in the fabrication of negative refraction index materials is due to the difficulty in designing and constructing magnetic resonators in the visible regime.

Attempts were made to create such structures and, some of them, had great success but all of them lack in isotropy and polarisation independence. Thus, the nowadays structures need to be improved in order to obtain the desired response.

In the same time, such structures can exhibit also electric resonance, usually at different wavelengths. In order to obtain both magnetic and electric resonances at the same (or close) wavelength thus having a frequency band where both the permittivity and permeability are negative one has to introduce additional structures that make the fabbrication of such devices tedious.

The aim of this project is, first of all to find a structure that can be used for obtaining isotropic (or at least polarisation insensitive) magnetic response in the visible range. As a further (more complex) task, this structure should be optimised so that the electric resonance takes place in the same frequency band thus eliminating the need for more complex structures.

In order to achieve the above mentioned goals, commercial simulation softwares are to be used thus, at the end of the project, the student will also aquire proficiency in using at least one package for FDTD simulations.

[1] Cai, Wenshan & al., “Metamagnetics with rainbow colors “, Optics Express, 15, 3333-3341, (2007)