8 February 2018 Electromagnetic response of dielectric nanostructures in liquid crystals
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Abstract
Sub-wavelength periodic metallic nanostructures give rise to very interesting optical phenomena like effective refractive index, perfect absorption, cloaking, etc. However, such metallic structures result in high dissipative losses and hence dielectric nanostructures are being considered increasingly to be an efficient alternative to plasmonic materials. High refractive index (RI) dielectric nanostructures exhibit magnetic and electric resonances simultaneously giving rise to interesting properties like perfect magnetic mirrors, etc. In the present work, we study light-matter interaction of cubic dielectric structures made of very high refractive index material Te in air. We observe a distinct band-like structure in both transmission and reflection spectra resulting from the interaction between magnetic and electric dipolar modes. FDTD simulations using CST software are performed to analyse the different modes excited at the band frequencies. The medium when replaced with liquid crystal gives rise to asymmetry in the band structure emphasizing one of the dominant magnetic modes at resonance frequencies. This will help in achieving a greater control on the excitation of the predominant magnetic dipolar modes at resonance frequencies with applications as perfect magnetic mirrors.
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S. Amanaganti, S. Amanaganti, D. R. Chowdhury, D. R. Chowdhury, M. Ravnik, M. Ravnik, J. Dontabhaktuni, J. Dontabhaktuni, } "Electromagnetic response of dielectric nanostructures in liquid crystals", Proc. SPIE 10555, Emerging Liquid Crystal Technologies XIII, 105551F (8 February 2018); doi: 10.1117/12.2289415; https://doi.org/10.1117/12.2289415
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