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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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A charge distribution has cylindrical symmetry if the charge density depends only upon the distance from the axis of the cylinder and does not vary along the axis or with the direction about the axis. In other words, if a system varies if it is rotated around the axis or shifted along the axis, it does not have cylindrical symmetry. In real systems, we do not have infinite cylinders; however, if the cylindrical object is considerably longer than the radius from it that we are interested in,...
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Self-Swerving Optical Force by Chiral Inhomogeneity.

Yuzhi Shi1,2,3,4, Chengxing Lai1,2,3,4, Fei Hu5

  • 1Shanghai Eye Disease Prevention & Treatment Center/Shanghai Eye Hospital, Institute of Precision Optical Engineering, School of Medicine, School of Physics Science and Engineering, Tongji University, Shanghai, China.

Advanced Materials (Deerfield Beach, Fla.)
|January 2, 2026
PubMed
Summary
This summary is machine-generated.

Chiral inhomogeneity in materials induces a reversible optical force, causing chiral spheres to self-swerve under linear polarized light. This discovery opens new avenues for optical manipulation and chiral detection.

Keywords:
chiral inhomogeneitychiral particlechiral‐light interactionoptical manipulationself‐swerving effect

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Soft Matter Physics

Background:

  • Light exerts optical forces, enabling particle manipulation in various scientific fields.
  • Particle motion is typically controlled by altering light properties like polarization.
  • Chiral inhomogeneity offers a novel mechanism for optical force manipulation.

Purpose of the Study:

  • To investigate the self-swerving behavior of chiral spheres under linearly polarized light.
  • To explore the role of chiral inhomogeneity in inducing reversible optical forces.
  • To understand the fundamental physics of chiral light-matter interactions.

Main Methods:

  • Experimental observation of chiral particles (nanometer to micrometer scale) in water.
  • Utilizing a linearly polarized light wave to induce optical forces.
  • Analyzing the relationship between chirality gradient and optical force direction.

Main Results:

  • Observed self-swerving motion in chiral spheres due to reversible optical forces.
  • Demonstrated that optical force direction reverses with changes in chirality gradient.
  • Confirmed self-swerving behavior across a range of chiral particle sizes.

Conclusions:

  • Chiral inhomogeneity provides a novel mechanism for controlling particle locomotion via optical forces.
  • The study advances the understanding of chiral-light interactions and optical forces in inhomogeneous media.
  • Potential applications include chiral detection, advanced optical manipulation, and micro-robotics.