In an awards ceremony held on October 17, Dr. Yasuhiro AWATSUJI of our
Department of Electronics, Graduate School of Science and Technology received
this honor and encouragement in the field of analysis and measurement technology.
Selected from among 29 applicants, Dr. Awatsuji's invention was seen as
original and showing potential for commercialization.1
His topic was, 'Parallel phase-shifting digital holography.' In this study,
he improved on conventional, digital holographic imaging by noiselessly
and instantaneously measuring three-dimensional objects with a phase shifting
array device that simultaneously uses three or four types of phase shifting
and a single-shot laser beam. This parallel digital holography uses light
and no chemicals such as fluorescent labels, making it a noninvasive safe
method for measuring living specimens. It also makes possible the three-dimensional
measurement of dynamically moving objects in the fields of biology and
medicine, fluidics and particle measurement, analysis on micro-machines,
a micro total analysis system (μ-TAS) and lab-on-a-chip, machinery vibration
and is expected to contribute to the invention of medicines, diagnostic
techniques and improvements in food sources.2 Dr. Awatsuji and colleagues are to be congratulated.
Associate Professor Awatsuji's current research interests involve the development
of a method and device for three-dimensional dynamic image measurement
of cells with parallel digital holographic microscopy. He has also holographically
recorded and reconstructed a moving image of the propagation of a Chinese
character for 'light'(). Recording and observing, three-dimensional images of a femto-second (one millionth of a nanosecond or 10-15 of a second) light pulse propagation is a first.
Essentially, "what was achieved was a 'temporal microscope' with a
magnification of more than 1010. The proposed technique is expected to be a powerful tool for directly
observing the ultrafast dynamics of atoms and molecules when applied to
electron holography or X-ray holography."3
2 Y. Awatsuji, M. Sasada, and T. Kubota, "Parallel quasi-phase-shifting digital holography," Applied Physics Letters Vol.85, No.6, pp.1069-1071 (2004).
3 T. Kubota, K. Komai, M. Yamagiwa, and Y. Awatsuji, "Moving picture recording and observation of three-dimensional images of femtosecond light pulse propagation," Optics Express, Vol. 15, No.22, pp.14348-14354, (2007). http://www.opticsinfobase.org/abstract.cfm?URI=oe-15-22-14348 (<= link to the pdf and movie files of the paper, Download Free.)