Research

Low energy opto-electronics

Colloidal semiconductor nanocrystals (nanoplatelets, perovskites…) have emerged as promising active materials for solution-processable opto-electronic and light-emitting devices such as nanocrystal lasers. Our group have achieved a nanolaser using colloidal nanocrystals that exhibits record-low threshold input power operating at room temperature using core-shell nanoplatelets, which are efficient nanocrystal emitters with the structure of quantum wells, coupled to a photonic-crystal nanobeam cavity that can highly confine and enhance the photoluminescence from emitters. The work is essential for nano-photonic and opto-electronic applications with reduced energy consumption.

 

Quantum confined emiters

Materials that confine electrons and holes in at least one dimension to quantum length scales exhibit unique quantum properties. This confinement can strongly modify both the optical and electronic properties of materials and produce strong quantum behavior. Notable examples include quantum wells, quantum dots, and atomically thin layered materials. We study the interactions of quantum confined materials with nanophotonic devices to create new sources of quantum light, novel opto-electronic devices operating at the fundamental energy limit, and efficient lasers and light emitting devices.

 

Quantum photonics

Rapid improvements in efficiency and sophistication are now extending these devices into the quantum regime, where single photons mediate interactions between embedded on-chip memories coupled to complex photonic circuits. We are studying methos to use integrated photonics to build large and complex quantum systems composed of photons and spins contained in a semiconductor chip.

 

Spintronic neurosensors

The brain is a complex network of interconnected circuits that exchange signals in the form of action potentials.  These action potentials hold the key to understanding how the brain processes information and generates complex thought.

 

Topological photonics

In recent years topological photonics has been realized in multitude of platforms. It has gained attention due the presence of unidirectional chiral propagation of light via the edge states which are again immue to any disorder in the system. Such system can open path to plethora of application in many body physics, strong ight matter interaction , quantum hall physics of light. In our roup we focus on studying the strong light matter interaction via a topological waveguide in a planar photonic crystal geometry.