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<p>Light–matter interactions are fundamental in materials fabrication and property control, with significant applications in broad fields. A notable phenomenon arises when optical forces are exerted among nanoparticles and microparticles, in which optical binding leads to the development of optical matters with a well-patterned structure. This work explores a dynamic optical matter of polystyrene microparticles (PS MPs) prepared at the air/solution interface under optical trapping, specifically focusing on the interactions between 1-µm and 20-µm PS MPs. We report the formation of an unprecedented three-dimensional (3D) bulky assembly where smaller particles form a necklace and belt assembly around the larger particle, created by multiple light scattering. The resulting assembly, which can exceed 50&#xa0;µm in diameter, elongates light–matter interaction lengths and exhibits reconfigurability tuning optical conditions, forming a unique dynamic optical matter with a random and disordered structure. As a result, we demonstrate amplified spontaneous emissions in the 3D bulky assembly thanks to the feature of randomness and multiple light scattering. These findings present a new approach to the study of reconfigurable and tunable optical matter, opening avenues for novel applications in disordered photonics and material science.</p> Graphical Abstract <p></p>

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Reconfigurable optical matter of polystyrene microparticles fabricated by optical trapping at solution surface

  • 期刊论文

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  • 发表日期：

    2025年5月8日

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  • Shuichi Toyouchi,
  • Hsuan-Yin Wang,
  • Tetsuhiro Kudo,
  • Hiroshi Masuhara

摘要

Light–matter interactions are fundamental in materials fabrication and property control, with significant applications in broad fields. A notable phenomenon arises when optical forces are exerted among nanoparticles and microparticles, in which optical binding leads to the development of optical matters with a well-patterned structure. This work explores a dynamic optical matter of polystyrene microparticles (PS MPs) prepared at the air/solution interface under optical trapping, specifically focusing on the interactions between 1-µm and 20-µm PS MPs. We report the formation of an unprecedented three-dimensional (3D) bulky assembly where smaller particles form a necklace and belt assembly around the larger particle, created by multiple light scattering. The resulting assembly, which can exceed 50 µm in diameter, elongates light–matter interaction lengths and exhibits reconfigurability tuning optical conditions, forming a unique dynamic optical matter with a random and disordered structure. As a result, we demonstrate amplified spontaneous emissions in the 3D bulky assembly thanks to the feature of randomness and multiple light scattering. These findings present a new approach to the study of reconfigurable and tunable optical matter, opening avenues for novel applications in disordered photonics and material science.

Graphical Abstract