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Assistant Professor (2019 - present)

Department of Engineering and System Science,

National Tsing Hua University


Assistant Research Fellow (joint appointment)

(2016 - present)

Instrument Technology Research Center,

National Applied Research Laboratories


Assistant Research Fellow (joint appointment)

(2017 - present)

National Synchrotron Radiation Research Center


Assistant Professor (2014 - 2019)

Department of Physics,

National Sun Yat-sen University


Ph.D., Physics, University of California, Los Angeles

           (2009 - 2013)


M.S.,   Physics, National Taiwan University

           (2000 - 2003)

B.S.,    Physics, National Taiwan University

           (1996 - 2000)

Chien-Chun Chen is an assistant professor in the Department of Engineering and System Science, National Tsing Hua University (NTHU). He received his Ph.D. degree in 2013 and has worked with Prof. Jianwei Miao since 2009. He received his B.S. and M.S. degrees from Nation Taiwan University in 2000 and 2003. His research interests are mainly related to X-ray Coherent Diffraction Imaging (CDI) and atomic resolution electron tomography in both theory and experiment. He worked as a research assistant to develop computational methods with Prof. Ting-Kuo Lee in Academia Sinica, Taiwan during 2003 to 2009. At the same time, he became a visiting scientist and participated in the experimental research in SPring-8, Japan.


Chien-Chun completed his doctoral degree at UCLA with expertise in electron tomography. Advances in recent years report that, with assumptions about the sample structure, Electron tomography can be used to determine the internal structure of nanomaterials at atomic resolutions. He and his colleagues now develop an electron-tomography method that bypasses such assumptions and determines the gold nanoparticle at 2.4 angstrom resolution, which is the best resolution in the world. This work let researchers peer 3D structures within nanoparticles and has been published in Nature 483, 444-447 (2012). [Highlighted by Nature Nanotech. 7, 275 (2012)]. Most recently, he combined electron tomography with filtering method that generated the first images of 3D atomic structures right at the core of dislocations. This work also has been published in Nature 496, 74-77 (2013). [Highlighted by Nature News&Views, "3D imagingof crystal defects", Nature, 496, 37-38 (2013)].


Chien-Chun's experience is not only in Electron Tomography, but also in X-ray Diffraction Microscopy. During five years research assistant in the Institute of Physics, Academia Sinica and four years in UCLA, he is constantly exploring on the development of algorithm to solve the phase retrieval problem in the field of Diffraction Tomography. Some recent works related to 3D reconstruction from limited 2D diffraction patterns have been published in Phys. Rev. B, 84, 024112 (2011), Phys. Rev. B. 79, 052102 (2009), and Phys. Rev. B 59, 064113 (2007). In particular, Chien-Chun currently develops a reconstruction method related to a novel 3D imaging technique, named Ankylography (derived from the Greek words ankylos meaning curved and graphein meaning writing), which allows scientists obtain 3D structure from single 2D diffraction pattern. It is experimentally demonstrated and theoretically explained in Phys. Rev. B, 84, 224104 (2011).


Chien-Chun keeps improving reconstruction skills while maintaining a focus on collaborating with experimental teams in Super Photon ring-8 GeV (SPring-8), the world's largest third-generation synchrotron radiation facility in Japan. Those collaborated research results reveal inner structures of biological and material samples have also been published in high-profile journals, such as the molten iron in Phys. Rev. Lett. 110, 205501 (2013), the Yeast cell in Proc. Natl. Acad. Sci. USA 107, 11234-11239 (2010), and the GaN-Ga2O3  core shell structure in Phys. Rev. Lett. 97, 215503 (2006). Besides achievements in both theory and experiment, Chien-Chun intensively participate in the projects of X-ray Free Electron Laser (X-FEL), scanning transmission electron microscopy (STEM), and cryo-electron microscopy (CryoEM) to catch the newest research topics and trend.

Chien-Chun also received two major awards in Taiwan, the Graduate Research Scholarship from Ministry of Education in 2007 and the Research Creativity Award from National Science Council in 1999.

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