Fresnel zone plates as focusing optics in the hard x-ray regime

Miscellaneous · Wed Jan 01 00:00:00 EST 1992

OSTI ID:7233117

Chrzas, J J

A mathematical model describing the focusing efficiency of transmission phase modulating Fresnel zone plates in the hard x-ray regime (>1keV) has been developed. The mathematical model is based on the x-ray optical properties (complex index of refraction) of the constituent materials, the incident energy, the thickness of the optic and a variable [alpha] which defines the material concentration profile within one zone plate period. The focusing properties (focusing efficiency and resolution) of two zone plates (Al-Cu and Ni) designed to optimally focus 8 keV photons have been experimentally measured at beamline X18b of the National Synchrotron Light Source located at Brookhaven National Lab. The experimental apparatus and procedures used to measure the focusing properties of the two zone plates and the techniques used in their fabrication have also been presented. The measured focusing efficiency has been compared to the theoretical predictions and has been found to be in agreement. The measured resolution of the Al-Cu zone plate has also been found to be in agreement with the expected geometric demagnification of the available x-ray source.

• Research Organization: Illinois Inst. of Tech., Chicago, IL (United States)
• OSTI ID: 7233117
• Resource Relation: Other Information: Thesis (Ph.D.)
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
36 MATERIALS SCIENCE
FRESNEL LENS
MATHEMATICAL MODELS
HARD X RADIATION
FOCUSING
LIGHT TRANSMISSION
ALUMINIUM ALLOYS
BEAM OPTICS
COPPER ALLOYS
NICKEL
REFRACTIVE INDEX
ALLOYS
ELECTROMAGNETIC RADIATION
ELEMENTS
IONIZING RADIATIONS
LENSES
METALS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
TRANSITION ELEMENTS
X RADIATION
663620* - Physics of Radiations Other Than Neutrons- (1992-)
360106 - Metals & Alloys- Radiation Effects