Spin‐Manipulated Photonic Skyrmion‐Pair for Pico‐Metric Displacement Sensing. Issue 12 (25th February 2023)

• Record Type: Journal Article
• Authors: Yang, Aiping; Lei, Xinrui; Shi, Peng; Meng, Fanfei; Lin, Min; Du, Luping; Yuan, Xiaocong
• Is Part Of: Advanced science. Volume 10:Issue 12(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-02-25
• Subjects: photonic skyrmions -- pico‐metric displacement sensing -- spin angular momentum -- surface plasmon polaritons; Science -- Periodicals; 505
• DOI: 10.1002/advs.202205249
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Photonic spin skyrmions with deep‐subwavelength features have aroused considerable interest in recent years. However, the manipulation of spin structure in the skyrmions in a desired manner is still a challenge, while this is crucial for developing the skyrmion‐based applications. Here, an approach of optical spin manipulation by utilizing the spin‐momentum equation is proposed to investigate the spin texture in a photonic skyrmion‐pair. With the benefit of the proposed approach, a unique spin texture with spin angular momentum varying linearly along the line connecting the two skyrmion centers is theoretically designed and experimentally verified. The optimized spin texture is then applied in a displacement‐sensing system, which is capable of attaining pico‐metric sensitivity. Compared with the conventional polarization and phase schemes, the spin‐based manipulation mechanism provides a new pathway for optical modulation, which is of great value in nanophotonics from both fundamental and application. Abstract : A robust, Angstrom‐scaled displacement‐sensing technique is proposed based on the structured spin texture in a photonic skyrmion‐pair, where the interaction between the skyrmions induces a linear change in spin texture within its central region over distances of hundred‐nanometers.