Gouy Phase Induced Optical Skyrmion Transformation in Diffraction Limited Scale,Laser & Photonics Reviews

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Gouy Phase Induced Optical Skyrmion Transformation in Diffraction Limited Scale
Laser & Photonics Reviews ( IF 9.8 ) Pub Date : 2024-09-06 , DOI: 10.1002/lpor.202400327
Jian Chen _{1,

2} , Xi Shen ₁ , Qiwen Zhan _{1,

2} , Cheng‐Wei Qiu ₃

Affiliation

Optical skyrmions are topologically stable quasiparticles that can be constructed with electric field, spin angular momentum, polarization Stokes vector, pseudospin, etc. In this letter, both theoretical and experimental studies are carried out to reveal the role of Gouy phase in the topology transformation during the tight focusing of Stokes skyrmions. The Stokes skyrmionic beam can be constructed by superposing two orthogonally polarized components with orthogonal spatial modes. The Gouy phase produced in the focused field depends on the orbital angular momentum carried by the high order mode component of the incident Stokes skyrmionic beam. While the beam size of the focused field is diffraction limited, the variation of the Stokes vectors in the skyrmion topology is in the sub‐diffraction limited scale. The presented results shed light on the understanding of the topology transformation between the incident and the tightly focused fields, paving the way for engineering the optical skyrmions in micro‐nano scale and their applications in information processing, quantum technology, metrology, etc.

中文翻译：

有限衍射尺度下的古伊相诱导光学斯格明子变换

光学斯格明子是拓扑稳定的准粒子，可以用电场、自旋角动量、偏振斯托克斯矢量、赝自旋等构造。本文通过理论和实验研究揭示了古伊相在拓扑变换中的作用。斯托克斯斯格明子的紧密聚焦。斯托克斯斯格明子光束可以通过叠加具有正交空间模式的两个正交偏振分量来构造。聚焦场中产生的古伊相位取决于入射斯托克斯斯格明子束的高阶模式分量所携带的轨道角动量。虽然聚焦场的光束尺寸受到衍射限制，但斯格明子拓扑中斯托克斯矢量的变化处于次衍射限制范围内。所提出的结果有助于理解入射场和紧密聚焦场之间的拓扑变换，为微纳尺度的光学斯格明子工程及其在信息处理、量子技术、计量等方面的应用铺平了道路。

更新日期：2024-09-06

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