Vibrations effect on 1nm focussing. K. Evans-Lutterodt NSLS-II VTG Januaury 22 2007. Outline. Background and important optics metrics Simple optics layout How we see the source; some stability reqs More complex layout (Waveguide) Can we position with 1nm beam sufficient accuracy?.
Vibrations effect on 1nm focussing
Januaury 22 2007
Figure courtesy of C. Jacobsen
Resolution of 1nm at l=1A requires NA < 0.1
If resolution is 1nm
=> then DOF =27nm
Mono deleted for clarity
~ 10 microns(v) x 40 microns (h)
Slit down in the horizontal to get 10 by 10.
Demagnify by 104 to get 1nm.
For a source to lens of 50m, this implies 5mm focal length.
If you include details, we expect focal lengths of between 1 to 5mm
(We would really like to get out to 100mm, but this is probably too tough, Aperture)
Main point: Easy to integrate lens and sample stage monolithically.
Angular uncertainty ~ (0.3 microns/ 3 meter) ~ 1e-7 radians
If sigma stability is 10%, then stability adds negligibly to size
If you are measuring fluorescence intensity, and we assume a gaussian profile
And we want to keep signal intensities within 1%:
Using zone plate as a guide: will have to revisit this in optics R&D
Aberration angular field of view , , is given by
Using N=1e5, F=0.1, =0.1nm
1e-3 radians which is much bigger than everything else so not a problem.
It is difficult, but possible.
Worry about materials, and temperature control.