Zone plate having annular or spiral shape and Y-shaped branching edge dislocation
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United States of America Patent
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Jan 9, 2018
Grant Date -
Jul 24, 2014
app pub date -
Sep 28, 2011
filing date -
Sep 28, 2011
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Abstract
Although, conventionally, there were two methods, (1) a wave was transmitted through a spiral phase plate and (2) a diffraction grating containing an edge dislocation was used, they incurred complication of a configuration and securement of a larger amount of space and were not efficient because each of the spiral wave generation methods needed an incident wave to be a plane wave and at least one time of imaging is necessary at the time of wave irradiation on an observation object. In order to efficiently generate the spiral wave having a sufficient intensity, a structure of edge dislocation is taken in into a pattern of the zone plate and a spiral pattern containing a discontinuous zone is formed. Moreover, a thickness and a quality of material that change the phase of the wave by an odd multiple of π are selected for a material of the wave-blocking section in the pattern.
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