Abstract
Polarization is a key property defining the state of light. It was discovered by Brewster, while studying light reflected from materials at different angles. This led to the first polarizers, based on Brewster's effect. Now, one of the trends in photonics is the study of miniaturized devices exhibiting similar, or improved, functionalities compared with bulk optical elements. In this work, it is theoretically predicted that a properly designed all-dielectric metasurface exhibits a generalized Brewster's effect potentially for any angle, wavelength and polarization of choice. The effect is experimentally demonstrated for an array of silicon nanodisks at visible wavelengths. The underlying physics is related to the suppressed scattering at certain angles due to the interference between the electric and magnetic dipole resonances excited in the nanoparticles. These findings open doors for Brewster phenomenon to new applications in photonics, which are not bonded to a specific polarization or angle of incidence.
Highlights
Polarization is a key property defining the state of light
In case of purely magnetic media, ma[1] and eE1, one can find a situation when the analogue to Brewster’s angle appears for s-polarized light, having the magnetic field vector parallel to the plane of incidence, which is orthogonal to the conventional Brewster effect in dielectric media
This section aims to show that the important phenomenology associated to the generalized Brewster effect
Summary
Polarization is a key property defining the state of light. It was discovered by Brewster, while studying light reflected from materials at different angles. Simultaneously have zero reflection for a given angle, except for the very particular case of e 1⁄4 m (impedance matched) at normal incidence[5] In this case, each polarizable portion of matter will have induced electric and magnetic dipoles having the same amplitude and phase leading to inhibition of backscattered radiation, that is, fulfilling the so-called first Kerker’s condition, originally derived for small magnetic particles[3]. In case of purely magnetic media, ma[1] and eE1, one can find a situation when the analogue to Brewster’s angle appears for s-polarized light, having the magnetic field vector parallel to the plane of incidence, which is orthogonal to the conventional Brewster effect in dielectric media All this findings remained a mere theoretical curiosity for almost 20 years, since for natural materials the magnetic response is typically very weak at optical frequencies (mE1). Polarization rotation in reflection from meta-films of bi-anisotropic split rings has been theoretically studied at microwave frequencies in connection to Brewster effect[11]
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