Experimental demonstration of a continuously variant fractional fourier transformer

Appl Opt. 1999 Aug 10;38(23):4985-9. doi: 10.1364/ao.38.004985.

Abstract

We demonstrate that an off-axis illuminated hemispherical-rod microlens acts as a fractional Fourier transformer with a continuously varying degree of fractionality. A complete theoretical treatment of the device as well as experimental results are presented.