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Coherent Diffractive Imaging (CDI)


 Coherent diffractive imaging (CDI) is also called coherent diffraction microscopy or lensless imaging.

 In the conventional microscopies, the resolution of image is determined by lens parameters and wavelength.

 To overcome the limit of resolution, we use x-ray which has small wavelength and collect diffraction signal of

specimen by detector instead of lens. By analyzing recorded diffracted intensity, it is able to retrieve not only

amplitude but also phase of the specimen. To allow it, the incident x-ray must be coherent, in other words,

the phase difference of incident light must be less then wavelength/2.




 We also use HeNe laser, x-ray free-electron laser (XFEL, the fourth generation of radiation source),

and have plan to use soft x-ray generated by high powered femto-second laser as well as synchrotron radiation sources.


 In this state-of-the-art imaging system, we can acquire high lateral resolution image (submitted) and depth resolution

by HeNe laser. Also it permits to analyze chemical components quantitatively even inside of specimen (submitted).

Furthermore, subcellular organism in biological system is able to retrieve (in preparation).


XLNP Department of Physics and Photon Science , GIST , 123 Cheomdan-gwagiro(Oryong-dong), Buk-ku, Gwangju, 500-712 Republic of Korea Tel : +82-062-715-2352 Dasan building 606

Designed by J.M.Kim and D.H.Kang / X-ray Laboratory for Nano-scale Phenomena

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