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Researchers have demonstrated stable three-dimensional trapping of silicon nanoparticles within the intensity minima of optical standing waves, a capability previously unattainable with standard materials like silica. This breakthrough leverages unique Mie resonances in silicon to manipulate microscopic objects without physical contact, significantly expanding the toolkit for precision sensing and advanced cooling techniques in quantum systems.

Source coveringQuantum Zeitgeist

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Researchers Trap Particles in Light’s Darkest Spots

Quantum ZeitgeistSeptember 18, 20265 min read

Silicon nanoparticles were stably held suspended within darkness, at an intensity minimum of light, a feat previously impossible with common materials like silica. This contrasts sharply with existing methods relying on pushing particles toward brighter areas, opening new possibilities for manipulating microscopic objects without disruption. Achieving stable three-dimensional control at these dark points extends the toolkit for precision sensing and advanced cooling techniques.

Silicon nanoparticles are now stably trapped within the intensity minima of an optical standing wave, unlike silica particles which cannot be held in this way. The technique utilises resonant meta-atoms, particles exhibiting strong Mie resonances, to manipulate microscopic objects using light. These resonances occur when particle size is approximately a few hundred nanometers, enabling stronger and more tunable optical forces than previously possible. Bin Lu and colleagues have achieved stable three-dimensional trapping of silicon nanoparticles within areas of low light intensity using an optical standing wave; conventional…

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