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Control of optical spin Hall shift in phase-discontinuity metasurface by weak value measurement post-selection.

Lee YU, Wu JW - Sci Rep (2015)

Bottom Line: Spin Hall effect of light is a spin-dependent transverse shift of optical beam propagating along a curved trajectory, where the refractive index gradient plays a role of the electric field in spin Hall effect of solid-state systems.Here, we identify that the relative optical spin Hall shift depends on incidence angle at PMS, and demonstrate a control of optical spin Hall shift by constructing weak value measurement with a variable phase retardance in the post-selection.Capability of optical spin Hall shift control permits a tunable precision metrology applicable to nanoscale photonics such as angular momentum transfer and sensing.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul, 03760, Korea.

ABSTRACT
Spin Hall effect of light is a spin-dependent transverse shift of optical beam propagating along a curved trajectory, where the refractive index gradient plays a role of the electric field in spin Hall effect of solid-state systems. In order to observe optical spin Hall shift in a refraction taking place at air-glass interface, an amplification technique was necessary such as quantum weak measurement. In phase-discontinuity metasurface (PMS) a rapid phase-change along metasurface takes place over subwavelength distance, which leads to a large refractive index gradient for refraction beam enabling a direct detection of optical spin Hall shift without amplification. Here, we identify that the relative optical spin Hall shift depends on incidence angle at PMS, and demonstrate a control of optical spin Hall shift by constructing weak value measurement with a variable phase retardance in the post-selection. Capability of optical spin Hall shift control permits a tunable precision metrology applicable to nanoscale photonics such as angular momentum transfer and sensing.

No MeSH data available.


Images of spin-dependent optical spin Hall shifts.(a) Relative transverse shifts are measured as a function of retardance Γ in cross-polarized polarizer/analyzer setup (blue solid circles) and in parallel-polarized polarizer/analyzer setup (red solid circles). Images of spin-dependent optical spin Hall shifts at Γ = 1/4 (vertical gray straight line in (a)) are obtained by processing each pixel signals in InGaAs-based NIR camera for (b) cross-polarized polarizer/analyzer setup, P1 = (1, 0)T and P2 = (0, 1), and (c) parallel-polarized polarizer/analyzer setup, P1 = (0, 1)T and P2 = (0, 1).
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f5: Images of spin-dependent optical spin Hall shifts.(a) Relative transverse shifts are measured as a function of retardance Γ in cross-polarized polarizer/analyzer setup (blue solid circles) and in parallel-polarized polarizer/analyzer setup (red solid circles). Images of spin-dependent optical spin Hall shifts at Γ = 1/4 (vertical gray straight line in (a)) are obtained by processing each pixel signals in InGaAs-based NIR camera for (b) cross-polarized polarizer/analyzer setup, P1 = (1, 0)T and P2 = (0, 1), and (c) parallel-polarized polarizer/analyzer setup, P1 = (0, 1)T and P2 = (0, 1).

Mentions: In order to obtain images of spin-dependent optical spin Hall shifts we employed InGaAs-based NIR camera. After two separate measurements of and , we calculated from each pixel signals. We examined how optical spin Hall shift behaves for s-polarization (y-polarization) and p-polarization (x-polarization) of extraordinary refraction beam. In Fig. 5(a) blue and red solid circles correspond to s-polarization (y-polarization) and p-polarization (x-polarization), respectively. As shown in Fig. 5(b,c), the relative transverse shifts show a sign reversal with the same magnitude, which is different from those observed in air-glass interface.


Control of optical spin Hall shift in phase-discontinuity metasurface by weak value measurement post-selection.

Lee YU, Wu JW - Sci Rep (2015)

Images of spin-dependent optical spin Hall shifts.(a) Relative transverse shifts are measured as a function of retardance Γ in cross-polarized polarizer/analyzer setup (blue solid circles) and in parallel-polarized polarizer/analyzer setup (red solid circles). Images of spin-dependent optical spin Hall shifts at Γ = 1/4 (vertical gray straight line in (a)) are obtained by processing each pixel signals in InGaAs-based NIR camera for (b) cross-polarized polarizer/analyzer setup, P1 = (1, 0)T and P2 = (0, 1), and (c) parallel-polarized polarizer/analyzer setup, P1 = (0, 1)T and P2 = (0, 1).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4564808&req=5

f5: Images of spin-dependent optical spin Hall shifts.(a) Relative transverse shifts are measured as a function of retardance Γ in cross-polarized polarizer/analyzer setup (blue solid circles) and in parallel-polarized polarizer/analyzer setup (red solid circles). Images of spin-dependent optical spin Hall shifts at Γ = 1/4 (vertical gray straight line in (a)) are obtained by processing each pixel signals in InGaAs-based NIR camera for (b) cross-polarized polarizer/analyzer setup, P1 = (1, 0)T and P2 = (0, 1), and (c) parallel-polarized polarizer/analyzer setup, P1 = (0, 1)T and P2 = (0, 1).
Mentions: In order to obtain images of spin-dependent optical spin Hall shifts we employed InGaAs-based NIR camera. After two separate measurements of and , we calculated from each pixel signals. We examined how optical spin Hall shift behaves for s-polarization (y-polarization) and p-polarization (x-polarization) of extraordinary refraction beam. In Fig. 5(a) blue and red solid circles correspond to s-polarization (y-polarization) and p-polarization (x-polarization), respectively. As shown in Fig. 5(b,c), the relative transverse shifts show a sign reversal with the same magnitude, which is different from those observed in air-glass interface.

Bottom Line: Spin Hall effect of light is a spin-dependent transverse shift of optical beam propagating along a curved trajectory, where the refractive index gradient plays a role of the electric field in spin Hall effect of solid-state systems.Here, we identify that the relative optical spin Hall shift depends on incidence angle at PMS, and demonstrate a control of optical spin Hall shift by constructing weak value measurement with a variable phase retardance in the post-selection.Capability of optical spin Hall shift control permits a tunable precision metrology applicable to nanoscale photonics such as angular momentum transfer and sensing.

View Article: PubMed Central - PubMed

Affiliation: Department of Physics and Quantum Metamaterials Research Center, Ewha Womans University, Seoul, 03760, Korea.

ABSTRACT
Spin Hall effect of light is a spin-dependent transverse shift of optical beam propagating along a curved trajectory, where the refractive index gradient plays a role of the electric field in spin Hall effect of solid-state systems. In order to observe optical spin Hall shift in a refraction taking place at air-glass interface, an amplification technique was necessary such as quantum weak measurement. In phase-discontinuity metasurface (PMS) a rapid phase-change along metasurface takes place over subwavelength distance, which leads to a large refractive index gradient for refraction beam enabling a direct detection of optical spin Hall shift without amplification. Here, we identify that the relative optical spin Hall shift depends on incidence angle at PMS, and demonstrate a control of optical spin Hall shift by constructing weak value measurement with a variable phase retardance in the post-selection. Capability of optical spin Hall shift control permits a tunable precision metrology applicable to nanoscale photonics such as angular momentum transfer and sensing.

No MeSH data available.