Materials and Structures

New materials and structures is crucial for the emergence or improvement of photonics technologies. Our emphasis is on the development of following:

Advanced optoelectronic alloys

Optoelectronic alloys form the basis for many photonic components, including laser diodes, LEDs, solar cells, and photodetectors. Our objective is to tailor the bandgap and structural properties of underexploited III-V material systems in order to expand their application area. Novel heterostructures to be addressed include: 

  • GaSbBi/GaSb compounds for the mid-infrared (mid-IR) range with type-I transition 
  • AlGaN structures for high-efficiency UV detection 
  • Low band-gap (0.7-1.1eV range) GaInNAsSb materials with lattice matching to GaAs

Nanomaterials, metamaterials and nanostructures

Tuning the material composition and structural design at the nanoscale opens up opportunities for devices with new functionalities or superior performances. Our objective is to develop structures for enhanced nonlinear light-matter interactions and for control of radiative processes by:

  • developing methods for engineering the optical properties of 2D materials (e.g., doping, functionalization, defect, strain, hetero-stacking) 
  • demonstrating plasmonic nanostructures and metamaterials with resonances in the unexplored near-IR and mid-IR spectral ranges 
  • designing ENZ nanostructures and nanomaterials with spatially extended modes

Photonics integration platforms

Photonic integrated circuits (PICs) are a key enabling technology for the next generations of computing, data storage, communication and sensing. PICs generally require hybrid platforms that can combine different types of materials and low-loss micro/nano-scale waveguides to enable on-chip functionalities. We target the following goals:

  • III-V/Si monolithic heterostructures for photonic device integration (light sources and components) 
  • micron-scale Si waveguides with losses <0.01 dB/cm 
  • low-loss nanoscale waveguides for the visible 
  • non-oxide waveguides for the mid-IR