+++ONLINE KOLLOQUIUM+++ Exotic Interactions with Light and Sound in Metamaterials with Broken Symmetries (Prof. Dr. Andrea Alù)

  • Date: Jan 19, 2021
  • Time: 14:30
  • Speaker: Prof. Dr. Andrea Alù
  • City University of New York
  • Location: +++ONLINE KOLLOQUIUM+++
In this talk, I discuss our recent research findings in nano-optics, electromagnetics and acoustics, showing how suitably tailored meta-atoms and arrays of them enable new phenomena to manipulate light, radio-waves and sound. I discuss venues to largely break Lorentz reciprocity and realize isolation without the need of a magnetic bias, based on broken time-reversal symmetry induced by mechanical motion, spatio-temporal modulation and/or nonlinearities.

I also discuss how broken symmetries in space and space-time provide the opportunity to induce topological order in metamaterials. Another class of metamaterials based on broken symmetries are parity-time symmetric media, which are asymmetric in space, but symmetric upon parity and time inversion, and can enhance the exotic response of metamaterials beyond the limitations of passive systems. In the talk, I will discuss the impact of these concepts from basic science to technology, from classical waves to quantum phenomena.

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