Next generation of compact flat optics using waveguide scatterer optical metasurfaces

Optical device, Science & engineering

UNMET NEED

Optical devices have become ubiquitous around us, from our trusted smartphone camera to the advanced medical devices we rely on to improve diagnosis. Over the last two decades, optical metasurfaces have pioneered significant enhancements in efficiency and performance. These flat surfaces, precisely sculpted with long thin nanostructures, have shown potential to improve miniaturization and integration of optical components, and have demonstrated unprecedented ability to manipulate light.

Despite their capabilities, optical metasurfaces have yet to be widely adopted due to high losses and reduced bending angles in broadband applications, complex nanomanufacturing and material limitations, and challenging computational design.

TECHNOLOGY OVERVIEW

Pr. Kéna-Cohen and his research team are tackling these challenges. They have demonstrated a simple approach for the design of diffraction gratings that can be highly efficient for large deflection angles, while also offering additional functionality. Such gratings are composed of a unit cell comprising a vertically oriented asymmetric slot waveguide. In contrast to metasurface-based gratings with multiple resonant sub-elements, they feature a periodic arrangement of single non-resonant elements that allows for broadband operation and a strong tolerance for variations in angle of incidence. Each waveguide or set of waveguides present in the unit cell receives a part of the incident wavefront and radiates in a symmetric or asymmetric fashion, which could be engineered precisely. The overall desired wavefront is obtained as a result of interference among such waveguide-radiators. This novel architecture offers:

• Versatile design for large bending angle broadband optical components,
• Easier manufacturing of low aspect ratio dielectric structures compatible with current production facilities,
• Enhanced computational modelling efficiency.

 

COMPETITIVE ADVANTAGES

  • Efficient large angle bending
  • Low loss dielectric optics
  • Short aspect ratio structures

 

BUSINESS OPPORTUNITY

  • Partnering for technology maturation for commercial applications
  • Accessing financing for industry-university maturation programs
  • Licensing technology

 

MARKET APPLICATIONS

  • Spectrometer gratings
  • High NA lenses
  • Custom optical components

 

IP PROTECTION

  • US patent pending

CONTACTS

Stéphane Kéna-Cohen, Ph.D

PRINCIPAL INVESTIGATOR
Associate Professor, Department of Engineering Physics
Polytechnique Montréal

 

Andréa Arias

CONTACT
Business Development Lead
C 1-514-36003079 X 134
andrea.arias@axelys.ca