Tailoring Polarization Conversion in Achiral All-Dielectric Metasurfaces by Using Quasi-Bound States in the Continuum

Tailoring Polarization Conversion in Achiral All-Dielectric Metasurfaces by Using Quasi-Bound States in the Continuum

Blog Article

Quasi-bound states in the continuum (quasi-BICs) supported in Leather Cafe Racer Jacket all-dielectric metasurfaces (MTS) are known for their confinement in real space and the notably high values of the quality factor Q.Recently, the properties of quasi-BICs have been employed to achieve polarization conversion with all-dielectric MTS.However, one of the main disadvantages of the current approaches is the dependence on the chirality of either the meta-atoms or their disposition.We present the possibility of achieving polarization conversion by using all-dielectric MTS with square and rectangular lattices of nano-disks.The precise tuning of the lattice and disks parameters allows to transform linearly polarized light into circularly polarized light with near unity polarization rates while maintaining the high Q values of quasi-BICs.

Moreover, by using double accidental BICs it is possible to obtain right and left circularly polarized light on Sensor Bracket demand just by varying the angle of incidence.