Return Jones matrices, representing a non-polarizing
optical element.
- - [m, n, ...] defines the size of the cell array JA
and therefore the number of mirror matrices returned.
 - - C is a cell array defining the size of the returned cell array
JA, 
size(JA)==size(C). The content of C is of not
evaluated in this case.
 
References:
-  E. Collett, Field Guide to Polarization,
      SPIE Field Guides vol. FG05, SPIE (2005). ISBN 0-8194-5868-6.
 -  R. A. Chipman, "Polarimetry," chapter 22 in Handbook of Optics II,
      2nd Ed, M. Bass, editor in chief (McGraw-Hill, New York, 1995)
 -  "Jones calculus",
      last retrieved on Jan 13, 2014.
 
See also: jones_unity.