Research

Bound states in the continuum (BICs) are waves that remain localized even though they coexist with a continuous spectrum of radiating waves that can carry energy away. In phononic crystal slab, BICs are vortex centers in the polarization directions of far-field transverse radiation.

We are now creating the 2D optomechanical devices with ultrahigh mechanical Q and investigating the behavior of polarization vortex centers when some symmetries are broken.

See: Nature Communications 11, 5216 (2020), Nature Communications 13, 3187 (2022)

An optically levitated dielectric nanoparticle in vacuum can have an ultrahigh mechanical Q. Therefore, it can be used for ultra-sensitive force detection, investigating the non-equilibrium thermodynamics of small systems, and testing the boundary between quantum and classical mechanics.

We proposed a scheme to couple the translational motion and librational motion of an levitated nanoellipsoid and to achieve high fidelity state transfer. We also considered an optomechanical array of levitated nanospheres in vacuum, and study phonon dynamics and energy transport in it.

See: Advanced Quantum Technologies 2020, 1900099 (2020), Journal of the Optical Society of America B 34, C8 (2017)