We work on observing, creating, and utilizing new phenomena related to the spatial distribution of light, with special interest in amplitude, phase, and polarization. Research topics include light carrying orbital angular momentum and its application to quantum information technologies, singular optics in birefringent crystals, and real time measurement of 3D object profiles.

We have been developing a technique for entangled photon sources utilizing spontaneous parametric down-conversion process. In particular, we focus on controlling frequency correlations of the photons. Such new technique are useful not only in the entanglement generation but also in the generation of spectrally pure single photons heralded by their sister photons.