Dielectric Metasurfaces for beam forming and manipulation

During the last few years, much research efforts have been focused on designing flat metasurfaces facilitating subwavelength light control and flat optical components such as lenses, holograms and more. All-dielectric metamaterials exhibit low absorption losses in the infrared (IR) and visible spectral ranges. Such dielectric metasurfaces implement the Huygens surface principle, by utilizing an overlap of electric and magnetic Mie-type resonances of the constituent high refractive index elements to reduce significantly backscattering of the impinging light. Consequently, complete 2π phase shift coverage and very high transmission can be achieved over relatively broad wavelength range. Our Group is working on a new design approach for obtaining wide angle, highly efficient, all-dielectric metasurface beam deflectors based on a genetic optimization algorithm. Based on deflector optimization it is possible to design more complex phase masks which realize a variety of highly-efficient flat optical devices such as lenses, holograms, etc.

2

Comments are closed