title: Observation of backaction and self-induced trapping in a planar hollow photonic crystal cavity.
abstract: The 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 μW).
authors.affiliation: Institut de Physique de la Matière Condensée, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
authors.forename: Nicolas
authors.initials: N
authors.lastname: Descharmes
authors.affiliation: Institut de Physique de la Matière Condensée, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
authors.forename: Ulagalandha Perumal
authors.initials: UP
authors.lastname: Dharanipathy
authors.affiliation: Institut de Physique de la Matière Condensée, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
authors.forename: Zhaolu
authors.initials: Z
authors.lastname: Diao
authors.affiliation: Institut de Physique de la Matière Condensée, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
authors.forename: Mario
authors.initials: M
authors.lastname: Tonin
authors.affiliation: Institut de Physique de la Matière Condensée, École Polytechnique Fédérale de Lausanne (EPFL), Station 3, CH-1015 Lausanne, Switzerland.
authors.forename: Romuald
authors.initials: R
authors.lastname: Houdré