Physics Department | Center for Photonics and Nanoelectronics | Lehigh University  

Prof. Ivan Biaggio
Organics for nonlinear optics
Organic Excitons
Laser Safety

Our group works in the wide fields of nonlinear optics and solid-state physics, under the common denominator of using our ability to control laser radiation (in space, time, and frequency) to affect how it interacts with matter. The resulting experiments then deliver information on how light-matter interaction takes place, multi-photon effects, and the electronic states of various materials. Recent activities have been the study of third-order nonlinear optical effects in small organic molecules and their dense assemblies — towards the development of a new paradigm for creating nonlinera optical materials for applications such as optical computing and all-optical switching — and the investigation of a single-crystal organic semiconductor such as rubrene — to understand the phsyics of photoexcitation, molecular excitons, and electronic transport.

Experimental facilities include pulsed lasers with pulse duration from hundreds of femtoseconds to picoseconds that are tunable thanks to nonlinear optical parametric processes, and our expertise includes pump and probe and degenerate four-wave mixing experiments, short-pulse induced photocurrent and photoluminescence, and multi-photon spectroscopy.

[Image: Colorful laser beams]

Research stories

Charge Transport in organic and inorganic polar crystals.

Organics for third order nonlinear optics: From Molecules, to Solid state materials, to Devices.

Photoexcitations and excitons in organic molecular crystals. The rubrene stories.

Experimental methods

Pump and probe on picosecond and nanosecond time scales.

Four-Wave Mixing.

Transient Grating.

Pump and Probe.

Holographic Time of Flight.

Maker Fringes.

Time-resolved photoluminescence.

Time-resolved photocurrent.

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