| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Directional Chiral Optical Emission by Electron-Beam-Excited Nano-Antenna |
| Xiang Xiong1, Zhao-Yuan Zeng1, Ruwen Peng1*, and Mu Wang1,2* |
1National Laboratory of Solid State Microstructures, School of Physics, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China
2American Physical Society, 100 Motor Parkway, Hauppauge, New York 11778, USA
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| Cite this article: |
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Xiang Xiong, Zhao-Yuan Zeng, Ruwen Peng et al 2023 Chin. Phys. Lett. 40 017801 |
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Abstract Manipulating directional chiral optical emissions on a nanometer scale is significant for material science research. The electron-beam-excited nanoantenna provides a favorable platform to tune optical emissions at the deep subwavelength scale. Here we present an L-shaped electron-beam-excited nanoantenna (LENA) with two identical orthogonal arms. By selecting different electron-beam impacting sites on the LENA, either the left-handed circularly polarized (LCP) or the right-handed circularly polarized (RCP) emission can be excited. The LCP and RCP emissions possess different emission directionality, and the emission wavelength depends on the arm length of the LENA. Further, we show a combined nanoantenna with two LENAs of different arm lengths. Induced by the electron beam, LCP and RCP lights emit simultaneously from the nanoantenna with different wavelengths to different directions. This approach is suggested to be informative for investigating electron-photon interaction and electron-beam spectroscopy in nanophotonics.
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Received: 19 October 2022
Editors' Suggestion
Published: 21 December 2022
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| PACS: |
78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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78.60.Hk
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(Cathodoluminescence, ionoluminescence)
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73.20.Mf
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(Collective excitations (including excitons, polarons, plasmons and other charge-density excitations))
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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