Flat Optics with Metasurfaces
Federico Capasso (Harvard University, Cambridge MA)
The design of fundamental optical components such as lenses, gratings, and holograms has remained essentially unchanged for at least fifty years, relying on textbook refractive and diffractive optics.
Subwavelength structured surfaces known as metasurfaces are leading to a fundamental reassessment of such designs with the emergence of optical components that circumvent the limitations of standard
ones and with entirely new functions. Our recent formulation of the generalized laws of reflection and refraction for metasurfaces has led us recently to demonstrate high quality ultrathin dielectric metalenses with diffraction limited performance1-3. Finally I will give examples of how this approach can be used to create complex vector beams.
1. M. Khorasaninejad et al. Science 352, 1190 (2016)
2. F. Aieta et al. Science 347, 1342 (2015)
3. N. Yu et al. Science 334, 333 (2011)