Optical Sciences

Biomolecules and nanostructures

The Optical Sciences group studies the interaction of light and matter. Our current focus is on detection and sensing/imaging with an emphasis on the development of integrated photonics. We are part of Twente University's Department of Science and Technology and member of the MESA+ institute.


Low-noise rotating sample holder for ultrafast transient spectroscopy at cryogenic temperatures

(full pdf)

Fanciulli R, Cerjak I, Herek JL
Review of Scientific Instruments
vol. 78, issue 5, p053102 may 7, 2007

We present the design and testing of a rotating device that fits within a commercial helium cryostat and is capable of providing at 4 K a fresh sample surface for subsequent shots of a 1-10 kHz amplified pulsed laser. We benchmark this rotator in a transient-absorption experiment on molecular switches. After showing that the device introduces only a small amount of additional noise, we demonstrate how the effect of signal degradation due to high fluence is completely resolved. © 2007 American Institute of Physics.
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