Abstract Details
| Beyond Fourier Transform Holography: Reference Guided Phase Retrieval | |
|---|---|
| Abstract ID | I&D-11 |
| Presenter | Diling Zhu |
| Presentation Type | Poster |
| Full Author List | D. Zhu (1,2) , B. Wu (1,2) , R. Rick (1,2) , Jo Stohr (2) , Andreas Scherz (2,3) |
| Affiliations | (1) Dept. of Applied Physics, Stanford University (2) Stanford Synchrotron Radiation Laboratory (3) Stanford Institute for Materials and Energy Science |
| Category | Instrumentation/Development |
| Abstract | While Fourier Transform Holography (FTH) enjoys an unambiguous imaging reconstruction, image resolution is determined by the reference hole size. Unfortunately, smaller reference hole means weaker reference scattering, thus takes quadratically longer data acquisition time for the same signal to noise ratio. Further more, sacrifices in field of view has to be made. On the other hand, phase retrieval methods from a single diffraction pattern takes full advantage of the scattering from the object, but sometimes suffers from slow convergence and the 'uniqueness problem'. Here we present a new image reconstruction scheme which shares the advantage of both techniques. By tuning the interference between the reference scattering and object scattering, two or more holograms can be taken. The variation in the hologram is then used as the guidance, incorporated into an iterative algorithm we term as reference guided phase retrieval (RPR), which promises fast and unique reconstruction. The result can be directly fed into the standard HIO algorithm to enhance the final reconstruction quality. The method can be accommodated to a broad range of experiment setups and we verify it's effectiveness with simulations and two different experiments [1,2]. |
| Footnotes | References:
1. A. Scherz, D. Zhu, et al., Physical Review Letters 101, 076101 (2008).
2. D. Zhu, B. Wu, et al., manuscript in preparation. |
| Funding Acknowledgement | The experiments were carried out at SSRL. Both SSRL and the conducted research are supported by the U.S. Department of Energy, Office of Basic Energy Sciences. |