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Observation of spin Hall effect in photon tunneling via weak measurements.

Zhou X, Ling X, Zhang Z, Luo H, Wen S - Sci Rep (2014)

Bottom Line: Photonic spin Hall effect (SHE) manifesting itself as spin-dependent splitting escapes detection in previous photon tunneling experiments due to the fact that the induced beam centroid shift is restricted to a fraction of wavelength.This photonic SHE is attributed to spin-redirection Berry phase which can be described as a consequence of the spin-orbit coupling.These findings provide new insight into photon tunneling effect and thereby offer the possibility of developing spin-based nanophotonic applications.

View Article: PubMed Central - PubMed

Affiliation: Laboratory for Spin Photonics, School of Physics and Electronics, Hunan University, Changsha 410082, China.

ABSTRACT
Photonic spin Hall effect (SHE) manifesting itself as spin-dependent splitting escapes detection in previous photon tunneling experiments due to the fact that the induced beam centroid shift is restricted to a fraction of wavelength. In this work, we report on the first observation of this tiny effect in photon tunneling via weak measurements based on preselection and postselection technique on the spin states. We find that the spin-dependent splitting is even larger than the potential barrier thickness when spin-polarized photons tunneling through a potential barrier. This photonic SHE is attributed to spin-redirection Berry phase which can be described as a consequence of the spin-orbit coupling. These findings provide new insight into photon tunneling effect and thereby offer the possibility of developing spin-based nanophotonic applications.

No MeSH data available.


(a) Schematic of the photonic SHE phenomenon in tunneling. A linearly polarized beam transmits through the potential barrier structure composed of two BK7 prisms embed with an Au film and then splits into left- and right-handed circularly polarized components, respectively. Here, the incident angle θi is fixed to 45° (at the interface of metal film). (b) shows the potential diagram of photon tunneling. The total energy of the incident photon is . The central metal core is the tunnel barrier and its potential can be described as .
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f1: (a) Schematic of the photonic SHE phenomenon in tunneling. A linearly polarized beam transmits through the potential barrier structure composed of two BK7 prisms embed with an Au film and then splits into left- and right-handed circularly polarized components, respectively. Here, the incident angle θi is fixed to 45° (at the interface of metal film). (b) shows the potential diagram of photon tunneling. The total energy of the incident photon is . The central metal core is the tunnel barrier and its potential can be described as .

Mentions: Figure 1 illustrates the SHE of photons tunneling through a three-layer barrier structure. A metal film (Au) acting as a tunneling barrier is bounded by two identical semi-infinite medium (two right angle BK7 prisms) on either side and only permits evanescent wave transmission. When the photons tunnel through the barrier, the photonic SHE occurs and the transmitted beam splits by a fraction of wavelength into its two left- and right-handed circularly polarized components. Here, the incident angle θi is fixed to 45°. The photonic SHE is the photonic version of the SHE in electronic systems, in which the photons play the role of the spin charges, and a refractive index gradient plays the role of the electric potential gradient212223.


Observation of spin Hall effect in photon tunneling via weak measurements.

Zhou X, Ling X, Zhang Z, Luo H, Wen S - Sci Rep (2014)

(a) Schematic of the photonic SHE phenomenon in tunneling. A linearly polarized beam transmits through the potential barrier structure composed of two BK7 prisms embed with an Au film and then splits into left- and right-handed circularly polarized components, respectively. Here, the incident angle θi is fixed to 45° (at the interface of metal film). (b) shows the potential diagram of photon tunneling. The total energy of the incident photon is . The central metal core is the tunnel barrier and its potential can be described as .
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4260228&req=5

f1: (a) Schematic of the photonic SHE phenomenon in tunneling. A linearly polarized beam transmits through the potential barrier structure composed of two BK7 prisms embed with an Au film and then splits into left- and right-handed circularly polarized components, respectively. Here, the incident angle θi is fixed to 45° (at the interface of metal film). (b) shows the potential diagram of photon tunneling. The total energy of the incident photon is . The central metal core is the tunnel barrier and its potential can be described as .
Mentions: Figure 1 illustrates the SHE of photons tunneling through a three-layer barrier structure. A metal film (Au) acting as a tunneling barrier is bounded by two identical semi-infinite medium (two right angle BK7 prisms) on either side and only permits evanescent wave transmission. When the photons tunnel through the barrier, the photonic SHE occurs and the transmitted beam splits by a fraction of wavelength into its two left- and right-handed circularly polarized components. Here, the incident angle θi is fixed to 45°. The photonic SHE is the photonic version of the SHE in electronic systems, in which the photons play the role of the spin charges, and a refractive index gradient plays the role of the electric potential gradient212223.

Bottom Line: Photonic spin Hall effect (SHE) manifesting itself as spin-dependent splitting escapes detection in previous photon tunneling experiments due to the fact that the induced beam centroid shift is restricted to a fraction of wavelength.This photonic SHE is attributed to spin-redirection Berry phase which can be described as a consequence of the spin-orbit coupling.These findings provide new insight into photon tunneling effect and thereby offer the possibility of developing spin-based nanophotonic applications.

View Article: PubMed Central - PubMed

Affiliation: Laboratory for Spin Photonics, School of Physics and Electronics, Hunan University, Changsha 410082, China.

ABSTRACT
Photonic spin Hall effect (SHE) manifesting itself as spin-dependent splitting escapes detection in previous photon tunneling experiments due to the fact that the induced beam centroid shift is restricted to a fraction of wavelength. In this work, we report on the first observation of this tiny effect in photon tunneling via weak measurements based on preselection and postselection technique on the spin states. We find that the spin-dependent splitting is even larger than the potential barrier thickness when spin-polarized photons tunneling through a potential barrier. This photonic SHE is attributed to spin-redirection Berry phase which can be described as a consequence of the spin-orbit coupling. These findings provide new insight into photon tunneling effect and thereby offer the possibility of developing spin-based nanophotonic applications.

No MeSH data available.