A thin-film optical filter used as a one-dimensional spatial filter is presented, and its design is briefly examined. The filter consists of a stack of quarter-wave dielectric layers upon a right-angle prism that selectively cancel a reflected or transmitted plane-wave front for various angles of incidence. Transmittance and reflectance are low-pass functions or high-pass functions of the angle of incidence with a high degree of steepness. In combination, these filters exhibit bandpass transmittance with a variable bandwidth. Applications to detection of extrasolar planets are briefly discussed.
© 2005 Optical Society of America
(070.6110) Fourier optics and signal processing : Spatial filtering
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.4170) Optical devices : Multilayers
(310.0310) Thin films : Thin films
Ivan Moreno, J. Jesus Araiza, and Maximino Avendano-Alejo, "Thin-film spatial filters," Opt. Lett. 30, 914-916 (2005)