Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter at the nanoscale. We do this by exploring ways to shape light and its environment. It's what we call active and passive control. Our current focus is on the interaction of light with biomolecules and nanostructures. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.
We participate in the EU-COST actions MP1102: Coherent Raman microscopy (MicroCor) and CM1202: Supramolecular photocatalytic water splitting (PERSPECT-H2O)


Robust and intuitive schemes for adaptive laser pulse shaping

  • Aliakbar Jafar Pour - Former member

  • Adaptive laser pulse shaping aims to deliver light energy to matter by tuning the relative arrival times of different colors. Metaphorically, one is looking for an optical melody to which a given material will "dance" most passionately. This multi-disciplinary research is at the interface of ultrafast optics, nonlinear spectroscopy, computational intelligence, and operator theory.
    Ideally, an adaptive optimization converges to the best solution, and also provides insight about the underlying physics of the problem. In practice, such problems are vulnerable to limitations such as numerical and physical noise, and it is difficult (if possible at all) to benchmark or to interpret the results. The focus of my research is to develop schemes to minimize the vulnerabilities of these optimizations and to obtain quantitative insight from them.
    Some of the optimized χ(2) and χ(3) optical processes are broadband second harmonic generation (SHG), broadband coherent anti-Stokes Raman scattering (CARS), and transient absorption (TA, aka "pump-probe"). Proposed schemes are studied with three approaches: simulation of a noise-free system, simulation of a system with different levels of noise, and eventually experimental verification.

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