Optical Torques on Dielectric Spheres in a Spin‐Gradient Light Field DOI
Haiyang Huang, Pin Chieh Wu, Zeyong Wei

et al.

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: April 15, 2025

Abstract Light carries spin angular momentum, which can be imparted to the particle, generating an optical torque (OT). For decades, it has been widely understood that this spin‐induced OT only occurs on anisotropic (e.g., dumbbell and rod) particles or absorbing gold) spheres. In contrast previous interpretations, herein a nontrivial mechanism is presented for measuring spin‐determined OTs non‐absorbing This counterintuitive emerges from gradient of imposes non‐uniformly distributed force/energy vectors particle. The opposite force both sides beam induce extraordinary spin‐gradient whose sign depends particle's permittivity rather than its position. negative more readily observable dielectric due elimination predominant positive OT. Experimentally, exquisitely measured using polystyrene sphere delicately labeled with tiny tail, showcasing strong correlation light polarization. study enriches fundamental understanding OT, offering marvelous applications circumvent heating effects in physical biomedical sciences.

Language: Английский

High-Speed Sorting of Sub-20 nm Chiral Particles via Toroidal-Enhanced Separated Potential Wells DOI
Jingyao Zhang, Tao He, Chengfeng Li

et al.

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: March 31, 2025

Enantioselective sorting at the nanoscale is highly significant in fields such as medical research, material science, and drug development. However, previous studies mainly focus on static chiral particle separation, hindering practical applications. Here, we utilize synergy between enantioselective potential wells flow to sort nanoparticle enantiomers a high velocity of 800 μm/s. An enhanced field induced by mirror-enhanced toroidal dipole employed amplify gradient force, creating separated for opposite chirality. By regulating force fluidic drag achieve 20 200 nm particles with separation distances larger than 32 48 μm area 70.96 × μm2, respectively. Furthermore, efficient also demonstrated their wells. Our work holds tremendous biotechnology, nanotechnology, pharmacology.

Language: Английский

Citations

0
Optical Torques on Dielectric Spheres in a Spin‐Gradient Light Field DOI
Haiyang Huang, Pin Chieh Wu, Zeyong Wei

et al.

Laser & Photonics Review, Journal Year: 2025, Volume and Issue: unknown

Published: April 15, 2025

Abstract Light carries spin angular momentum, which can be imparted to the particle, generating an optical torque (OT). For decades, it has been widely understood that this spin‐induced OT only occurs on anisotropic (e.g., dumbbell and rod) particles or absorbing gold) spheres. In contrast previous interpretations, herein a nontrivial mechanism is presented for measuring spin‐determined OTs non‐absorbing This counterintuitive emerges from gradient of imposes non‐uniformly distributed force/energy vectors particle. The opposite force both sides beam induce extraordinary spin‐gradient whose sign depends particle's permittivity rather than its position. negative more readily observable dielectric due elimination predominant positive OT. Experimentally, exquisitely measured using polystyrene sphere delicately labeled with tiny tail, showcasing strong correlation light polarization. study enriches fundamental understanding OT, offering marvelous applications circumvent heating effects in physical biomedical sciences.

Language: Английский

Citations

0