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Cavity-Enhanced Evanescent Waves Trap Microparticles

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Hank Hogan

Like surfers riding an ocean swell, micron-size particles respond to light and can be trapped and arranged in regular patterns. However, it has been difficult to produce a strong enough optical interaction to achieve this micromanipulation over large areas. Now scientists at the University of St. Andrews in the UK have demonstrated a potential solution, using a dielectric resonator and a prism coupler to create Fabry-Perot-like cavity modes that increase the force exerted by evanescent waves. Colloidal particles form an array of linear chains in response to counterpropagating evanescent...Read full article

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