He who seeks shall find.

-- Italian Proverb

Our research embraces several key areas of nanoelectronics and nanophotonics, including organic semiconductor thin films, nanowires and plasmonics, as well as new ideas on specialty optical fibers and “cognitive photonic networks”. We are particularly interested in fundamental properties of materials emerging from small dimensionality, large interface area, hybridization and artificial nanostructuring.

Some topics of current focus are:

Light emission and detection at the nanoscale. Low dimensional semiconductors, like quantum dots and nanowires, offer immense possibilities for tailoring the optoelectronic response of heterogeneous nanoscale devices. We study the fundamental mechanisms of charge carrier photogeneration, transport and recombination in these nanostructures at an extremely broad time and energy scales, and implement prototype devices such as nanowire photodetectors, nanowire lasers, and quantum dot solar cells.

These studies will push the scaling limits of photodetectors and nanoscale light sources to be used in integrated photonic circuits.

Organic optoelectronics. Organic semiconductors (conjugated polymers, molecular crystals, small molecules) and organic-inorganic hybrids (organo-metal halide perovskites, heterostructures) are widely considered for applications in low-cost organic solar cells, light-emitting diodes, field-effect transistors and sensors. Lying at the boundary between conventional semiconductor crystals and disordered materials, these systems have extremely rich photophysical properties.

By advancing the understanding of fundamental optical and transport properties of these systems, we aim at finding new ways to optimize efficiency and extend functionality of organic photovoltaic, light/chemical sensing, and light emitting devices.

Specialty optical fibers and photonic networks. Optical fibers provide a mature mass-manufacturable technology that has given rise to complex networks of interconnected computing nodes transferring information around the planet. Our research in this area involves three layers of activity: novel fabrication techniques enabling multi-material nano-composite embedded fibers, all-optical fiber based devices for in-line information processing, and the exploration of novel networks for solving complex computational problems, such as NP hard problems, as well as alternative network protocols for all-optical neuromorphic computing.

These technologies may drastically increase the efficiency and capacity of existing electronic computers and telecommunication networks.