It is shown that a hemispherical-rod microlens can act as a fractional Fourier transform device with a continuously varying degree of fractionality. It is believed to be the first proposed device to perform such a task; its most immediate applications include optical tomography.
© 1998 Optical Society of America
(070.1170) Fourier optics and signal processing : Analog optical signal processing
(070.2590) Fourier optics and signal processing : ABCD transforms
(110.2760) Imaging systems : Gradient-index lenses
(200.4740) Optics in computing : Optical processing
D. Dragoman, K.-H. Brenner, M. Dragoman, J. Bähr, and U. Krackhardt, "Hemispherical-rod microlens as a variant fractional Fourier transformer," Opt. Lett. 23, 1499-1501 (1998)