Controlling photonic spin Hall effect via exceptional points
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...
| Main Authors: | , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/138743 |
| _version_ | 1811681046144483328 |
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| author | Zhou, Xinxing Lin, Xiao Xiao, Zhicheng Low, Tony Alù, Andrea Zhang, Baile Sun, Handong |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Zhou, Xinxing Lin, Xiao Xiao, Zhicheng Low, Tony Alù, Andrea Zhang, Baile Sun, Handong |
| author_sort | Zhou, Xinxing |
| collection | NTU |
| description | 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. |
| first_indexed | 2024-10-01T03:34:43Z |
| format | Journal Article |
| id | ntu-10356/138743 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:34:43Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1387432023-02-28T19:56:21Z Controlling photonic spin Hall effect via exceptional points Zhou, Xinxing Lin, Xiao Xiao, Zhicheng Low, Tony Alù, Andrea Zhang, Baile Sun, Handong School of Physical and Mathematical Sciences Centre for Disruptive Photonic Technologies (CDPT) MajuLab, CNRS-UCA-SU-NUS-NTU International Joint Research Unit Science::Physics::Optics and light Spin Hall Effect Photonic Systems 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. Published version 2020-05-12T05:55:10Z 2020-05-12T05:55:10Z 2019 Journal Article 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 2469-9950 https://hdl.handle.net/10356/138743 10.1103/PhysRevB.100.115429 2-s2.0-85072812391 11 100 en Physical Review B 10.21979/N9/TFZXPJ © 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. application/pdf |
| spellingShingle | Science::Physics::Optics and light Spin Hall Effect Photonic Systems Zhou, Xinxing Lin, Xiao Xiao, Zhicheng Low, Tony Alù, Andrea Zhang, Baile Sun, Handong Controlling photonic spin Hall effect via exceptional points |
| title | Controlling photonic spin Hall effect via exceptional points |
| title_full | Controlling photonic spin Hall effect via exceptional points |
| title_fullStr | Controlling photonic spin Hall effect via exceptional points |
| title_full_unstemmed | Controlling photonic spin Hall effect via exceptional points |
| title_short | Controlling photonic spin Hall effect via exceptional points |
| title_sort | controlling photonic spin hall effect via exceptional points |
| topic | Science::Physics::Optics and light Spin Hall Effect Photonic Systems |
| url | https://hdl.handle.net/10356/138743 |
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