Light field control

PREIN develops novel approaches for controlling key properties of optical fields.

Polarization and coherence control

We exploit the recent developments in following:

  • the generation of 3D vector fields from strongly focused light
  • the generation of strong evanescent fields in nanostructured materials
  • the spectral/temporal transformation of light fields via nonlinear interactions

Our goals are to: 

  • control 3D focal fields in arbitrary and adaptive ways 
  • describe and harness the coherence of 3D vector fields 
  • control the coherence dynamics of broadband fields

Temporal and spectral control

Artificial photonic crystals and metamaterials have revolutionized photonics, changing our vision of how light can be manipulated. These concepts are currently limited to the spatial domain. Our goal is to expand these concepts to the temporal and spectral domains by: 

  • developing a framework to describe spacetime topology of light in optical waveguides 
  • designing and demonstrating dynamic time-varying optical waveguides 
  • developing a new toolbox based on machine learning for generating light fields with controllable temporal and spectral statistical properties

Nanoscale localization

Tailoring light-field localization is central to suppressing or enhancing emission from quantum emitters, enhancing nonlinear interactions, and shaping the radiation pattern of light sources. We aim at removing the present roadblocks in optimum localization by: 

  • providing a complete description of individual nanoparticles, epsilon-near-zero (ENZ) materials, and other complex nanostructures in terms of their eigenmodes 
  • tailoring the excitation field for efficient coupling of light into the modes of nanostructures 
  • engineering ENZ materials for control of radiative properties of quantum emitters