Descharmes, NicolasDharanipathy, Ulagalandha PerumalDiao, ZhaoluTonin, MarioHoudre, Romuald2013-05-132013-05-132013-05-13201310.1103/PhysRevLett.110.123601https://infoscience.epfl.ch/handle/20.500.14299/92175WOS:000316411100007The optomechanical coupling between a resonant optical field and a nanoparticle through trapping forces is demonstrated. Resonant optical trapping, when achieved in a hollow photonic crystal cavity is accompanied by cavity backaction effects that result from two mechanisms. First, the effect of the particle on the resonant field is measured as a shift in the cavity eigenfrequency. Second, the effect of the resonant field on the particle is shown as a wavelength-dependent trapping strength. The existence of two distinct trapping regimes, intrinsically particle specific, is also revealed. Long optical trapping (> 10 min) of 500 nm dielectric particles is achieved with very low intracavity powers (< 120 mu W). DOI: 10.1103/PhysRevLett.110.123601text::journal::journal article::research article