Colloquium

  • Optical chaos – a new kind of light with applications to optical sensing and computing

  • Speaker : Francois Amblard
    Affiliation : Ulsan National Institute of Science and Technology (UNIST)
    Date : November 13, 2019 4:00 PM
    Place : Bldg.110 Rm. N103
    Contact : hkpak@unist.ac.kr
    Host : 박혁규(Hyuk Kyu Pak)
  • Abstract

  • Understanding the mysteries of light is a fundamental research effort in Physics. It never stopped in the past 200 years, until the ground breaking inventions of today like quantum or optical computers. Three years ago, we started in IBS-UNIST a fundamental research project statistical optics with experiments and theory, and we discovered by chance new kind of light which opens a broad field of applications. I will first provide an introduction to the notions of wave, optical field, polarization and intereferences, and then describe how a new sort of light can be produced using simple home-made random optical cavities. Photons inside these cavities behave as gaz molecules with a statistically uniform density and isotropically distributed direction. However, due to maximal coherence, the cavity acts as a random resonator that produces a 3D complex intereference pattern with maximal local disorder. This new light led us to invent the concept of random interferometry, which can be used to explore various phenomena with an unprecedented sensitivity. Patentable applications arise in the field of optical sensors for light scattering, microfluidics, or vibration and acoustic detection. Finally, the optical chaos we produced is classical but it has interesting quantum-like and topological properties, like entanglement, that could be used for the emerging domain of classical optical computers.