Inside Front Cover: Miniature probe for all‐optical double gradient‐index lenses photoacoustic microscopy (J. Biophotonics 12/2018)

Optical‐resolution photoacoustic microscopy and endoscopy are powerful tools for medical imaging. However, implementation of the imaging heads or miniature imaging probes with high resolution and long working distance has been technically challenging. The novel design of using double gradient‐index lenses for light focusing and a fiber Fabry‐Perot ultrasound sensor for sound detection provides a simple approach to implement such a miniature imaging probe. Further details can be found in the article by Zhendong Guo, Guangyao Li, and Sung‐Liang Chen ( e201800147 )