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Time is of philosophical interest as well as the subject of mathematical and scientific research. Even though it is a concept familiar to most, the passage of time remains one of the greatest enigmas of the universe. The philosopher Augustine once said: "What then is time? If no one asks me, I know what it is. If I wish to explain it to him who asks me, I do not know." The concept time indeed cannot be explained in simple terms. Emotions, life, and death - all are related to our interpretation of the irreversible flow of time. After a discussion of the concept of time, we will review...

Read more about Stopping Time

Femtosecond Techniques 1. Linear and nonlinear propagation of light a. Propagation of electromagnetic waves in dense media b. Dielectric function c. Lorentz equations, Drude model d. Pulse dispersion c. Nonlinear response f. Second harmonic generation and inversion symmetry (*) g. Self phase modulation and self-focusing h. Continuum generation 2. Femtosecond measurements a. Pump-probe technique b. Dispersion compensation techniques (*) c. Representation of pulses; Wigner representation d. Temporal characterization of pulses e. Joint time-frequency measurements (*) f. Frequency-resolved... Read more about Femtosecond Techniques for Materials Scientists

The tutorial starts at a basic level, so everyone starts out on solid ground, but then quickly advances to state-of-the-art femtosecond techniques. The first part of the tutorial deals with the interaction of light with matter and, after refreshing some basic concepts of electromagnetism, moves on to nonlinear optical processes that are relevant for the propagation of femtosecond laser pulses. The second part deals with measurement techniques. Part of the tutorial will be taught in an interactive format. That is to say, the participants will work through a number of problems in small groups... Read more about Femtosecond Techniques for Materials Scientists

Time is of philosophical interest as well as the subject of mathematical and scientific research. Even though it is a concept familiar to most, the passage of time remains one of the greatest enigmas of the universe. The philosopher Augustine once said: "What then is time? If no one asks me, I know what it is. If I wish to explain it to him who asks me, I do not know." The concept time indeed cannot be explained in simple terms. Emotions, life, and death - all are related to our interpretation of the irreversible flow of time. After a discussion of the concept of time, we will review... Read more about Stopping Time

Video of persentation available on Museum of Science Current Science and Technology page.

Video of persentation available on Museum of Science Current Science and Technology page.

Femtosecond laser pulses provide an opportunity to fabricate optical devices at the microscale and to design new materials for optoelectronic applications. By marrying the ultrafast with the ultrasmall we can fabricate novel nonlinear nanophotonic devices that can serve as all-optical logic gates for future telecommunication needs. In this lecture I will provide an overview of our work on femtosecond laser micromachining of transparent materials, femtosecond laser doping of semiconductors, and recent advances we have made to realize nanowire based all-optical logic gates.