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.

 

Imaging local acoustic pressure in microchannels

(full pdf)

Jorick van't Oever, Raimond Frentrop, Daniel Wijnperlé, Herman Offerhaus, Dirk van den Ende, Jennifer Herek, and Frieder Mugele
Applied Optics
vol. 54, issue 21 / july 20 2015
doi:10.1364/AO.54.006482

A method for determining the spatially resolved acoustic field inside a water-filled microchannel is presented. The acoustic field, both amplitude and phase, is determined by measuring the change of the index of refraction of the water due to local pressure using stroboscopic illumination. Pressure distributions are measured for the fundamental pressure resonance in the water and two higher harmonic modes. By combining measurement at a range of excitation frequencies, a frequency map of modes is made, from which the spectral line width and Q-factor of individual resonances can be obtained.
© 2015 Optical Society of America
Printable version