Spin–orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopy
The study of spin–orbit coupling (SOC) of light is crucial to explore the light–matter interactions in sub-wavelength structures. By designing a plasmonic lattice with chiral configuration that provides parallel angular momentum and spin components, one can trigger the strength of the SOC phenomena...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2023-04-01
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| Series: | Nanophotonics |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/nanoph-2023-0065 |
| _version_ | 1797817377797177344 |
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| author | Taleb Masoud Samadi Mohsen Davoodi Fatemeh Black Maximilian Buhl Janek Lüder Hannes Gerken Martina Talebi Nahid |
| author_facet | Taleb Masoud Samadi Mohsen Davoodi Fatemeh Black Maximilian Buhl Janek Lüder Hannes Gerken Martina Talebi Nahid |
| author_sort | Taleb Masoud |
| collection | DOAJ |
| description | The study of spin–orbit coupling (SOC) of light is crucial to explore the light–matter interactions in sub-wavelength structures. By designing a plasmonic lattice with chiral configuration that provides parallel angular momentum and spin components, one can trigger the strength of the SOC phenomena in photonic or plasmonic crystals. Herein, we explore the SOC in a plasmonic crystal, both theoretically and experimentally. Cathodoluminescence (CL) spectroscopy combined with the numerically calculated photonic band structure reveals an energy band splitting that is ascribed to the peculiar spin–orbit interaction of light in the proposed plasmonic crystal. Moreover, we exploit angle-resolved CL and dark-field polarimetry to demonstrate circular-polarization-dependent scattering of surface plasmon waves interacting with the plasmonic crystal. This further confirms that the scattering direction of a given polarization is determined by the transverse spin angular momentum inherently carried by the SP wave, which is in turn locked to the direction of SP propagation. We further propose an interaction Hamiltonian based on axion electrodynamics that underpins the degeneracy breaking of the surface plasmons due to the spin–orbit interaction of light. Our study gives insight into the design of novel plasmonic devices with polarization-dependent directionality of the Bloch plasmons. We expect spin–orbit interactions in plasmonics will find much more scientific interests and potential applications with the continuous development of nanofabrication methodologies and uncovering new aspects of spin–orbit interactions. |
| first_indexed | 2024-03-13T08:52:33Z |
| format | Article |
| id | doaj.art-ba9662d074e74bbda0001f5f10bb5712 |
| institution | Directory Open Access Journal |
| issn | 2192-8614 |
| language | English |
| last_indexed | 2024-03-13T08:52:33Z |
| publishDate | 2023-04-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Nanophotonics |
| spelling | doaj.art-ba9662d074e74bbda0001f5f10bb57122023-05-29T09:46:24ZengDe GruyterNanophotonics2192-86142023-04-0112101877188910.1515/nanoph-2023-0065Spin–orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopyTaleb Masoud0Samadi Mohsen1Davoodi Fatemeh2Black Maximilian3Buhl Janek4Lüder Hannes5Gerken Martina6Talebi Nahid7Institute of Experimental and Applied Physics, Kiel University, 24098Kiel, GermanyInstitute of Experimental and Applied Physics, Kiel University, 24098Kiel, GermanyInstitute of Experimental and Applied Physics, Kiel University, 24098Kiel, GermanyInstitute of Experimental and Applied Physics, Kiel University, 24098Kiel, GermanyIntegrated Systems and Photonics, Faculty of Engineering, Kiel University, 24143Kiel, GermanyIntegrated Systems and Photonics, Faculty of Engineering, Kiel University, 24143Kiel, GermanyIntegrated Systems and Photonics, Faculty of Engineering, Kiel University, 24143Kiel, GermanyInstitute of Experimental and Applied Physics, Kiel University, 24098Kiel, GermanyThe study of spin–orbit coupling (SOC) of light is crucial to explore the light–matter interactions in sub-wavelength structures. By designing a plasmonic lattice with chiral configuration that provides parallel angular momentum and spin components, one can trigger the strength of the SOC phenomena in photonic or plasmonic crystals. Herein, we explore the SOC in a plasmonic crystal, both theoretically and experimentally. Cathodoluminescence (CL) spectroscopy combined with the numerically calculated photonic band structure reveals an energy band splitting that is ascribed to the peculiar spin–orbit interaction of light in the proposed plasmonic crystal. Moreover, we exploit angle-resolved CL and dark-field polarimetry to demonstrate circular-polarization-dependent scattering of surface plasmon waves interacting with the plasmonic crystal. This further confirms that the scattering direction of a given polarization is determined by the transverse spin angular momentum inherently carried by the SP wave, which is in turn locked to the direction of SP propagation. We further propose an interaction Hamiltonian based on axion electrodynamics that underpins the degeneracy breaking of the surface plasmons due to the spin–orbit interaction of light. Our study gives insight into the design of novel plasmonic devices with polarization-dependent directionality of the Bloch plasmons. We expect spin–orbit interactions in plasmonics will find much more scientific interests and potential applications with the continuous development of nanofabrication methodologies and uncovering new aspects of spin–orbit interactions.https://doi.org/10.1515/nanoph-2023-0065angular momentumcathodoluminescenceplasmonic crystalspin-orbit coupling |
| spellingShingle | Taleb Masoud Samadi Mohsen Davoodi Fatemeh Black Maximilian Buhl Janek Lüder Hannes Gerken Martina Talebi Nahid Spin–orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopy Nanophotonics angular momentum cathodoluminescence plasmonic crystal spin-orbit coupling |
| title | Spin–orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopy |
| title_full | Spin–orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopy |
| title_fullStr | Spin–orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopy |
| title_full_unstemmed | Spin–orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopy |
| title_short | Spin–orbit interactions in plasmonic crystals probed by site-selective cathodoluminescence spectroscopy |
| title_sort | spin orbit interactions in plasmonic crystals probed by site selective cathodoluminescence spectroscopy |
| topic | angular momentum cathodoluminescence plasmonic crystal spin-orbit coupling |
| url | https://doi.org/10.1515/nanoph-2023-0065 |
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