Photonic spin Hall effect in hyperbolic metamaterials at visible wavelengths

Abstract

Photonic spin Hall effect in transmission is a transverse beam shift of the out-coming beam depending on polarization of the in-coming beam.The effect can be significantly enhanced by materials with high anisotropy. We report the first experimental demonstration of the photonic spin Hall effect in a multilayer hyperbolic metamaterial at visible wavelengths (wavelengths of 520 nm and 633 nm). The metamaterial is composed of alternating layers of gold and alumina with deeplysubwavelength thicknesses, exhibiting extremely large anisotropy. The angle resolved polarimetric measurements showed the shift of 165 µm for the metamaterial of 176 nm in thickness. Additionally the transverse beam shift is extremely sensitive to the variations of the incident angle changing theoretically by 270 µm with one milli-radian (0.057 • ). These features can lead to minituarized spin Hall switches and filters with high angular resolution.

Hyperbolic Metamaterial with Quantum Dots for Enhanced Emission and Collection Efficiencies

“…[8] Recently, hyperbolic metamaterials (HMM) structures, made of sub-wavelength thick alternate planar metal and dielectric layers, have been proposed to provide broadband enhancement to the spontaneous emission of various solid-state emitters based on QDs as well as nanodiamonds. [19][20][21][22][23][24][25][26] These HMM structures have a highly anisotropic permittivity tensor with metallic properties along some and dielectric properties in the other directions. This anisotropy provides the HMM a hyperbolic dispersion with the high-k modes having unbounded momentum values along specific directions in the ideal and lossless case.…”

Ultrathin and Ultrasmooth Gold Films on Monolayer MoS2

“…Ultrathin gold films (thickness < 10 nm) have recently attracted a great deal of interest both for the development of flexible transparent electrodes for optoelectronic devices including thin‐film solar cells, displays and touchscreens, photodetector and light emitting diodes, and for studying quantum‐size effects in metal films . Certainly, high‐quality ultrathin films are also the key element of plasmonic waveguides and hyperbolic metamaterials …”

Optics with hyperbolic materials [Invited]

“…9. Conceptual illustration of photonic spin Hall effect through (a) a planar [14] and (b) hemi-cyrindrical multilayer hyperbolic metamaterial (hyperlens) [101]. The transverse beam shift along the y-axis is denoted as < Y >.…”

“…So HMMa as materials with extreme anisotropy can be employed to facilitate the PSHE. The spin Hall effect in HMMs has been theoretically [101,[103][104][105] and experimentally [14,50] studied recently. First experimental observation of the spin Hall effect in HMMs was reported for microwave frequencies, where directional surface waves on HMM were steered by input polarization states [50].…”

“…Typically, HMMs contain alternating deeply-subwavelength metal and dielectric features. Among basic HMMs configurations there are multilayer stacks with thin films of subwavelength thicknesses [10][11][12][13][14][15][16], shallow [17,18] and deep nanotrenches structures [19][20][21], and arrays of metal nanowires [22][23][24][25][26][27][28] as illustrated in Fig. 1.…”