- 著者
-
Kuniaki Nagayama
- 出版者
- THE PHYSICAL SOCIETY OF JAPAN
- 雑誌
- Journal of the Physical Society of Japan (ISSN:00319015)
- 巻号頁・発行日
- vol.73, no.10, pp.2725-2731, 2004-10-15 (Released:2007-07-25)
- 参考文献数
- 31
- 被引用文献数
-
5
Conventional phase retrieval in transmission microscopy is applicable only to weak objects that perturb the incidence with a phase that is π⁄2 or smaller. We propose a novel phase retrieval technique applicable to strong objects. The innovation core is the scanning of a knife-edge, which is conventionally fixed to recover phase information. The synchronous operation between the scanning of the knife-edge and the image accumulation enables a novel spatial filter, which draws phase retardations by objects in the form of their first derivative. Combining the left- and right-scanning of the knife-edge can completely expel image components that are non-linear to the wavefront functions. Theoretical formulation of knife-edge scanning filters and corresponding numerical simulations specific to an electron microscope are proposed.