An experimental optical physicist who coauthored a single-beam gradient-force optical trap for dielectric particles. A tightly focused laser creates a restoring force toward the high-intensity region, allowing a small particle to be held without mechanical contact. The work helped establish optical manipulation as a practical way to control microscopic objects.[ref]
Observation of a single-beam gradient force optical trap for dielectric particles by Arthur Ashkin and others. Original report: single focused beam and dielectric-particle trapping
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