Welcome to the Laboratory of Prof. Rashid Zia in the School of Engineering at Brown University. Our group works in the field of nanophotonics at the interface of electrical engineering, materials science, optical physics, and physical chemistry. In particular, we study how light is emitted from a range of solid-state quantum emitters (including atoms, defect centers, ions, molecules, and quantum dots), and we develop new ways to control and enhance the process of light emission for photonic devices.
The multipolar (electric dipole, magnetic dipole, and electric quadrupole) transitions in solid-state quantum emitters are natural microscopic analogues to the artificial scattering resonances in metamaterials and optical antennas. By developing new techniques to directly quantify and access specific transitions, we seek to engineer improved devices that can exploit the full range of light-matter interactions and provide unique control over the underlying electronic systems. For example, our work on optical-frequency magnetic dipole transitions in lanthanide ions has shown how higher-order transitions can be used to tune and modulate emission, even at sub-lifetime scales.