Optical Vortex and Ferrocell: A Comparative Study, presented at MMM2020
Optical Vortex and Ferrocell: A Comparative Study
Alberto Tufaile, T. A. Vanderelli, M. Snyder, Adriana Pedrosa Biscaia Tufaile
We are presenting some results of our experiments of image formation using a device in which light is scattered by a thin film of ferrofluid, the Ferrocell, subjected to an external magnetic field and comparing them with the effect of optical vortex 1-7. When the light passes through this thin layer of ferrofluid, we can observe directly, with the naked eye, the formation of interesting luminous patterns. In addition to this, we can also observe the effects of light polarization in this system using a polariscope. Some interesting applications of this type of device include optical switches, or the simulation of atmospheric optics known as jumping laser dogs, just to cite few of them. Another potential application is characterizing and controlling the quality of compound magnets observing the patterns formed in this type of Hele-Shaw cell filled with ferrofluids, known as Ferrocell. Using polarized light, the pattern formation curiously resembles the nodal lines of the transverse electric and magnetic modes observed in optical resonant cavities, associated with the hypergeometric polynomials 6, such as Hermite-Gauss, Laguerre-Gauss, and Ince-Gauss polynomials. In this analogy, the magnetic field has an equivalent role of the Gaussian irradiance distribution, and the light source is a very flat lamp normal to z, which nearly corresponds to a plane wave with constant flux set up to the z-axis, analogous to a standing wave in the optical cavity. In this work, we are exploring the analogy between our experiment with the mode conversion in a laser cavity with our system, because mode convergion requires Hermite-Gaussian (HG) modes, which can easily be made inside the laser cavity and in our experiment using polarized light.
References:
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2) A. Tufaile, T. A. Vanderelli, A. P. B. Tufaile, Advances in Condensed Matter Physics 2017, Article ID 2583717 (2017).
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5) A.P.B Tufaile, T.A. Vanderelli, R. Amorim, A. Tufaile, Proceedings of the 12th Conference on Light and Color in Nature, 24–25 (2016).
6) A. Tufaile, T. A. Vanderelli, M. Snyder, A. P. B. Tufaile, Condens. Matter 2019, 4, 35.
7) A. Tufaile, T. A. Vanderelli, M. Snyder, A. P. B. Tufaile, Controlling Light Diffraction with Magnetic Nanostructures; TechConnect Briefs: Boston, MA, USA; ISBN 978-009988782-8-7, (2019).