Technical University of Munich and Helmholtz Center Munich 1 article published in JoVE Bioengineering Wideband Optical Detector of Ultrasound for Medical Imaging Applications Amir Rosenthal1, Stephan Kellnberger1, Murad Omar1, Daniel Razansky1, Vasilis Ntziachristos1 1Institute for Biological and Medical Imaging (IBMI), Technical University of Munich and Helmholtz Center Munich Optical detection of ultrasound is impractical in many imaging scenarios because it often requires stable environmental conditions. We demonstrate an optical technique for ultrasound sensing in volatile environments with miniaturization and sensitivity levels appropriate for optoacoustic imaging in restrictive scenarios, e.g. intravascular applications.