Kenneth Evans-Lutterodt, A. Stein, and A.
Isakovic
National Synchrotron Light Source,
Brookhaven National Laboratory
Abstract:
In the last few years there has been rapid progress in the field of optics for
hard X-ray photons, and this, in conjunction with synchrotron sources, have enabled
many new scientific problems to be addressed. One relatively new optic in this
field is the kinoform optic, which can be viewed as either an array of coherently
interfering micro-lens segments or a blazed zone plate. We use nanofabrication
techniques to produce these optics. We will review the basic features of this optic
and will present both experimental and numerical results that we have obtained. In
particular we will show analytically and experimentally the key advantage of a
kinoform optic relative to a refractive optic, the fact that the aperture of the
optic is not limited by absorption. We will also show the main advantage relative
to the zone plate, that compound lenses allow one to exceed the limitations of a
single lens, and allow us to exceed the critical angle limit. Our current best spatial
resolution from focusing will be presented, and results that prove that the kinoform
is a phase preserving optic, and our focusing results obtained at energies as low as
7.35keV and as high as 30keV. We will discuss the relative merits of different materials
for this class of optics, and will show our progress in materials other than silicon.
Measurements of a kinoform prism will also be presented. Finally we will go beyond the
optics we can fabricate today, and speculate where the limits of kinoform optic might be
with improved fabrication techniques.
2009 Run
Sept. 23rd to Nov. 10th
