Shih-Chi Chen, Ph.D.
Assistant Professor, Department of Mechanical and Automation Engineering
The Chinese University of Hong Kong
I will present our recent work on femtosecond laser manipulation based on digital micromirror devices (DMD) and binary hologram; and their applications in developing the next-generation two-photon and random-access microscopes. The DMD-based pulse/beam shaper can arbitrarily shape the laser at a speed of up to 30 MHz and 32 kHz respectively. In the second part, I will present the development of a flexure-based vibrating blade microtome for sectioning soft tissues with submicron level flatness and precision. Cutting mechanism of soft tissues is modeled based on fracture mechanics in order to establish quantitative relationships between the sectioning quality, i.e. flatness, and microtome operation parameters, including vibration frequency, amplitude, and sample feed rate. The precision microtome can be integrated with the two-photon microscope to generate volumetric image of an entire organ, such as a mouse brain or liver, with subcellular resolution.
Prof. Shih-Chi Chen received his B.S. degree in Mechanical Engineering from the National Tsing Hua University, Taiwan, in 1999. He received his S.M. and Ph.D. degrees in Mechanical Engineering from the Massachusetts Institute of Technology, Cambridge, in 2003 and 2007, respectively. Following his graduate work, he entered a post-doctoral fellowship in the Wellman Center for Photomedicine, Harvard Medical School, where his research was focused on biomedical optics and endomicroscopy. Before joining CUHK, he was a Senior Scientist at Nano Terra, Inc., a start-up company founded by Prof. George Whitesides at Harvard University, to develop novel methods and precision instruments for the control of various interface functionalities and soft lithography. His current research interests include precision engineering, laser optics, MEMS, and nanomanufacturing. Prof. Chen is a member of the following professional societies: ASME, ASPE, SPIE, IEEE, and OSA. He is the recipient of a 2003 R&D 100 Award for the design of a microscale six-axis nanopositioner.