Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/138743
Title: Controlling photonic spin Hall effect via exceptional points
Authors: Zhou, Xinxing
Lin, Xiao
Xiao, Zhicheng
Low, Tony
Alù, Andrea
Zhang, Baile
Sun, Handong
Keywords: Science::Physics::Optics and light
Issue Date: 2019
Source: Zhou, X., Lin, X., Xiao, Z., Low, T., Alù, A., Zhang, B., & Sun, H. (2019). Controlling photonic spin Hall effect via exceptional points. Physical Review B, 100(11), 115429-. doi:10.1103/PhysRevB.100.115429
Journal: Physical Review B
Abstract: The photonic spin Hall effect (SHE), featured by a spin-dependent transverse shift of an impinging optical beam driven by its polarization handedness, has many applications including precise metrology and spin-based nanophotonic devices. It is highly desirable to control and enhance the photonic SHE. However, such a goal remains elusive, due to the weak spin-orbit interaction of light, especially for systems with optical loss. Here we reveal a flexible way to modulate the photonic SHE via exceptional points, by exploiting the transverse shift in a parity-time (PT) symmetric system with balanced gain and loss. The underlying physics is associated with the near-zero value and abrupt phase jump of the reflection coefficients at exceptional points. We find that the transverse shift is zero at exceptional points, but it is largely enhanced in their vicinity. Moreover, the transverse shift switches its sign across the exceptional point, resulting from spontaneous PT-symmetry breaking. Due to the sensitivity of transverse shift at exceptional points, our work also indicates that the photonic SHE can enable a precise way to probe the location of exceptional point in photonic systems.
URI: https://hdl.handle.net/10356/138743
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.100.115429
Rights: © 2019 American Physical Society. All rights reserved. This paper was published in Physical Review B and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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