Wavelength-tuned transformation between photonic skyrmion and meron spin textures

Author:

Lin Min1ORCID,Liu Qing2,Duan Huigao234ORCID,Du Luping1ORCID,Yuan Xiaocong1ORCID

Affiliation:

1. Nanophotonics Research Centre, Institute of Microscale Optoelectronics & State Key Laboratory of Radio Frequency Heterogeneous Integration, Shenzhen University 1 , Shenzhen 518060, China

2. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University 2 , Changsha 410082, China

3. Advanced Manufacturing Laboratory of Micro-Nano Optical Devices, Shenzhen Research Institute, Hunan University 3 , Shenzhen 518000, China

4. Greater Bay Area Institute for Innovation, Hunan University 4 , Guangzhou 511300, China

Abstract

Topological spin textures, among which skyrmions and merons are typical examples, have with their swirling vectorial structures triggered enormous interest in physical systems including elementary particles and magnetic materials. Manipulating their symmetry and topology is important for understanding the mechanisms that underlie their topological phase transformation as well as offering tunable degrees of freedom to encode information, which has already been demonstrated in magnetic materials. Recently, the photonic counterparts of skyrmions and merons were constructed in a 2D wave system with deep-subwavelength features promising for optical sensing, imaging, and information decoding. However, their experimental realization relied on stringent excitation conditions that only support a single spin texture type on a specific structure. Here, we demonstrate for the first time the transformation between photonic skyrmion and meron spin lattices on the same metallic meta-surface having a well-designed structural period. We show experimentally the wavelength-tuned symmetry transformation of the photonic spin lattices, which are also found to be robust against disorder in the structure to a certain degree. This work provides new insights into controlling the electromagnetic field symmetry and topology, as well as in developing applications in spin optics and topological photonics.

Funder

Guangdong Major Project of Basic Research

National Natural Science Foundation of China

Natural Science Foundation of Guangdong Province

Science, Technology and Innovation Commission of Shenzhen Municipality

Publisher

AIP Publishing

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