Photonics and Nanomaterials

Quantum Dots - Laser Applications

Controllable emission wavelength of QDs allows making laser at any colors. Quantum Dot is a promising materials for low threshold and temperature insentive laser.

Solid State Lighting with Quantum-Dots Nanoporous-Gallium-Nitride Nanocomposite Materials

A white Light Emitting Diode (LED) is made from nanocomposite materials which is incorporation of color-tunable colloidal quantum dot into nanoporous Gallium Nitride scaffold adjacent to active area (quantum well) of blue LED.

Quantum Dots - Single Photon Emitter Arrays

Silica encapsulated colloidal quantum dots were synthesized by water-in-oil microemulsion growth technique. The Electrostatic Force Self-Assembly Method (EFSA) was developed to pattern the single colloidal quantum dot silica spheres in an array. Each element in the array was demonstrated as single photon emitter.

Organic-Inorganic Hybrid nanostructured devices

This research goal is to investigate the (In)GaN/organic semiconductor hybrid heterojunction device as a part of ongoing efforts to improve the performance of (In)GaN-based optoelectronic devices and to explore novel materials.

Highly Efficient Forster Energy Transfer in Ultrathin Organic - Inorganic Quantum Dot Hybrid Films

The research demonstrates near-field photon-mediated coupling of vastly dissimilar optical excitations in the two materials that can reach efficiencies of up to 98% at room temperature. The optical attributes of our quantum dot/J-aggregate hybrids are highlighted by their robust excitonic transition at room temperature with spectrally concentrated absorption and emission strengths.

A Compact Aerosol Sensor and Spectroscopic Sorting with Ultraviolet LEDs

A compact system incorporating a 32-element linear array of ultraviolet (UV) light-emitting diodes (LEDs) to the in-flight fluorescence detection of aerosolized particles. Custom electronics manage a standalone system and enable real-time processing of spectral data, which is used to cue a miniaturized aerodynamic deflector for physical particle separation.

Blue-Green and Ultraviolet micro-LEDs in Neural Imaging and Stimulation

Developed nitride based blue-green and ultraviolet microscale LED devices with particular classes of imaging and spectroscopic applications in cellular level biology. We illustrated the utility of the blue-green micro-LEDs for voltage sensitive dye imaging of individual neural cells, as well as their ultraviolet counterparts for photo stimulation of neurons.