报告题目： Optically-digitalised holography in photopolymers by a femtosecond pulsed laser beam

报告人： Dr. Xiangping Li

Centre for Micro-Photonics, Faculty of Engineering and Industrial Sciences, Swinburne University of Technology, Hawthorn VIC 3122, Australia

报告地点：物理楼 中212

报告时间：6月28日 上午9:00-9:45

联系人：吕国伟（6276 6017）

摘要：

Invented by Dennis Gabor, holography provides a true 3D view by recording both the amplitude and phase information as an interference pattern in an intensity-sensitive photopolymer, which has been well heralded as a key technology for the next generation display. Computer-generated holography is a key revolution technology that removes the necessity of a recording process and digitally generates the phase inhomogeneity at a sub-wavelength scale. However, the current electrically digitalising methods relying on an electronic device can allow only the phase modulation in a region on the order of a few tens of wavelengths with a limited number of phase modulation pixels, which represents a major obstacle for large viewing angle and high definition display. In this talk, I will introduce the optically-digitalised holography in photopolymers. The refractive-index change hence the phase modulation within a sub-wavelength scale can be digitalised by the intensity of a tightly focused femtosecond pulse. Applying this feature, I demonstrate dynamic holographic display of a 3D object. The demonstrated holographic display by a femtosecond pulse paves a new way for optical 3D display as well as many advanced all-optical manipulations including micro optics and binary optics.

Dr. Xiangping Li is a research fellow at Centre for Micro-Photonics (CMP), Swinburne University of Technology. He completed his PhD at CMP in 2009. He has produced more than 20 publications in Nature Photonics, Nature Communications and Optics Letters. His research is focused on nanophotonics, multi-dimensional optical data storage and holographic display. He is also an awardee of Australian Postdoctoral Fellowship in 2011 and Swinburne’s Vice-Chancellor research award for early career in 2012.