Noviembre 26, 2021
Bound States in the Continuum in Anisotropic Planar Structures
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Date
Noviembre 26, 2021
Featured speakers
Samyobrata Mukherjee
Postdoctoral researcher at ICFO
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Samyo studied for his B.Sc. at St. Stephen’s College of the University of Delhi. He then obtained a M.Sc. from the School of Physics of the University of Hyderabad in India, where he worked on transverse spin in surface plasmons for his Masters thesis. In October 2016, Samyo moved to Barcelona to pursue a PhD at ICFO in the group of Prof. Lluis Torner and Prof. David Artigas. His PhD research focused on studying the properties of bound states in the continuum in anisotropic structures and he defended his thesis in October 2021. He is currently a postdoctoral researcher at ICFO.
Bound states in the continuum (BICs) are radiationless modes embedded in the part of the spectrum associated with radiating modes. BICs are a general wave phenomenon and occur in quantum, acoustic and photonic systems. Among other photonic systems, anisotropic planar waveguides can support full-vector, hybrid BICs. We use the leaky mode formalism to study these structures and the anisotropy-induced BICs they support. I will introduce the concept of anisotropy-induced BICs and describe their properties in different geometries. The properties of the BIC modes allow us to define anisotropy-symmetry regimes. I shall then describe how the mechanism underlying anisotropy-induced BICs can be used to control the radiation from leaky modes in these geometries and obtain perfectly unidirectional radiation via unidirectional guided resonances. Finally, I will relate anisotropy-induced BICs to D’yakonov surface waves via the existence of surface BIC modes at an interface between two anisotropic materials with opposite birefringence.
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