Tingting Tang

Loss enhanced spin Hall effect of transmitted light through anisotropic epsilon- and mu-near-zero metamaterial slab

Spin Hall effect of light (SHEL) is prosperous in precision metrology and quantum information processing. In normal situations, the inevitable loss of material will greatly weaken SHEL, which is a major constraint to its potential applications. We first report the loss enhanced SHEL through epsilon and mu-near-zero (EMNZ) metamaterial slab by anisotropic configuration of epsilon and mu tensors. It is verified that the loss of EMNZ metamaterial can effectively enlarge the splitting between right-circularly polarized (RCP) and left-circularly polarized light (LCP) components of linear polarized light even when the incident angle is much larger than critical angle. Calculation results show that when the imaginary part of permeabilitys vertical component is equal to 0.1, a flat-top transverse shift peak can be observed which remains unchanged for different vertical component of permeability and thickness of EMNZ metamaterial. In this case the maximum transverse shift of left-circularly polarized light can be increased to 24.676 micrometers by EMNZ metamaterial loss without any amplification method. Meanwhile, the transverse shifts of RCP (LCP) light can be modulated flexibly by EMNZ metamaterial loss. Therefore the loss enhanced SHEL makes quantum devices applicable which paves the way towards on-chip and inter-chip optical circuitry.

Imbert-Fedorov Effect in Kretschmann Configuration with Anisotropic Metamaterial

We study the Imbert-Fedorov (IF) effect in Kretschmann configuration with anisotropic metamaterial to explore a flexible method to enhance and modulate IF shift. The physical mechanism for large IF shifts in an anisotropic waveguide based on spin-orbit angular momentum coupling is explained. The influences of metamaterial thickness, anisotropy, and loss on IF shift are systematically discussed. This provides a theoretical prediction of IF shift in a Kretschmann configuration which is verified by simulation results in semiconductor metamaterial waveguide. The simulation results show that both metamaterial anisotropy and loss contributes significantly to the IF shift. Thus, reducing the loss and enhancing the metamaterial anisotropy are necessary and important measures to realize enhanced IF effect in the proposed Kretschmann configuration.

Spin Hall Effect Enhancement of Transmitted Light Through an Anisotropic Metamaterial Slab

We study the spin Hall effect (SHE) enhancement of transmitted light through an anisotropic metamaterial slab. Physical mechanism of large transverse shift is explained based on the coupling between spin angular momentum and orbit angular momentum. Theoretical analysis predicts large transverse shift of transmitted light can be realized by four possible combinations of real or imaginary z component of the wave vectors, which is verified by simulation results. The anisotropy of metamaterial brings greatly enhanced SHE of transmitted light but the metamaterial loss and dispersion will reduce the transverse shift significantly. A maximum transverse shift of 15.24 μm (12λ) can be achieved in an anisotropic metamaterial of ZnGaO/ZnO multilayer without any amplification method.

Magneto-Optical Imbert–Fedorov Effect in Prism Coupling Configuration

We study the Imbert–Fedorov (IF) effect in prism coupling configuration with magneto-optical (MO) material, which is called MOIF effect. An effective refractive index method MO waveguide is obtained based on the solution of Maxwells equations. The expressions for IF and MOIF shifts are also derived. As left-handed circularly polarized (LHCP) and right-handed circularly polarized (RHCP) light beams have different effective refractive indices in MO waveguide when polar or longitudinal MO Kerr effects are taken into account, their IF shifts are asymmetric which are different from symmetric IF shifts in isotropic waveguides. By applying opposite magnetic field, a maximum MOIF shift close to 400 μm can be obtained with special waveguide configuration. MO effect will provide a new method to enhance and modulate the transverse shifts of LHCP and RHCP lights, which has not been considered up to now.