Polarization independent silicon grating antenna based on subwavelength metamaterials
Résumé
Optical antennas are key components of an optical phased array system, enabling light coupling between the chip and the free space. In such systems, surface gratings are commonly used as antenna elements, which however suffer from a strong polarization sensitivity of their scattering angle and efficiency. Here, we experimentally demonstrate a surface grating antenna with polarization insensitive behavior on the 500 nm silicon-on-insulator platform exploiting subwavelength metamaterials. The antenna successfully achieves the same diffraction angle of 10° for both TE and TM polarizations, an estimated scattering efficiency of -4 dB, and a difference in diffraction efficiency between the two polarizations smaller than 1 dB over a bandwidth of 31 nm. This antenna facilitates efficient light coupling into and out of photonic integrated circuits.
Origine : Fichiers produits par l'(les) auteur(s)
Licence : CC BY - Paternité
Licence : CC BY - Paternité