Abrupt modifications of the fields across an interface can be engineered by depositing an array of sub-wavelength resonators specifically tailored to address local amplitude, phase and polarization changes [1]. Physically,... [ view full abstract ]
Abrupt modifications of the fields across an interface can be engineered by depositing an array of sub-wavelength resonators specifically tailored to address local amplitude, phase and polarization changes [1]. Physically, ultrathin nanostructure arrays, called ‘‘metasurfaces’’, control light by engineering artificial boundary conditions of Maxwell’s equations. Metasurfaces have been implemented to obtain various sorts of optical functionalities, ranging from the basic control of the transmission and reflection of light, to the control of the radiation patterns for comprehensive wavefront engineering [2]. Here, we review the recent works in this field and explain which physical mechanisms are utilized for the design of efficient planar optical components. We will present our results on free-standing semiconductor metasurfaces and conclude with the concept of conformal boundary optics: an analytical method based on first-principle derivation to engineer transmission and reflection at free-form interfaces [3].
[1] Yu, Genevet,et al., Science 334,333 (2011)
[2] Genevet, et al. Optica 4 (1), 139-152 (2017)
[3] Han, Wong, Molardi & Genevet, PRA 94, 023820 (2016).
Acknowledgments: PG acknowledges support from ERC Grant agreement no. 639109.
