Diffraction from 2d Lenses in the ISM

1
Diffraction from 2d Lenses in the ISM Dan
Stinebring, John Matters, Dan Hemberger, T.
Joseph Lazio Oberlin College, Naval
Research Lab
The parameters of the lenses shown below are the
following. All widths are expressed in units in
which the entire observer plane (not just the
zoomed-in version) extends from 1 to 1 along
each axis. The Gaussian has sx sy 0.05. The
filled ellipse has sx 0.05 and sy 0.025. The
shell-like lens has sx 0.05, sy 0.025 and Dr
0.005.
1The secondary spectrum is the squared modulus of
the 2d Fourier transform of the basic observable
(flux density as a function of frequency and
time).
Figure Labeling. We use the following
convention columns are labeled 1 6 (left to
right) and rows are labeled a d (top to
bottom). Odd numbered columns are depictions of
the intensity modulation at the observer plane.
Even numbered columns are horizontal
cross-sectional cuts through the intensity
pattern.