We introduce the concept of Rayleigh reflectors where extremely sharp angular spectra with unity reflectance are obtained across considerable angular extents. Enabling the device is a rapid, high-efficiency transition from an evanescent to a propagating first-order substrate wave occurring at the Rayleigh angle. A high-index nanolayer located adjacent to the substrate is seen to critically affect the resulting spectra. Away from the Rayleigh anomaly, the device is a basic guided-mode resonance (GMR) high reflector. Hence, this device connects the fundamental concepts of GMR and the Rayleigh anomaly with interesting possible applications, including filters and couplers.
© 2013 Optical Society of America
Diffraction and Gratings
Original Manuscript: January 22, 2013
Revised Manuscript: February 20, 2013
Manuscript Accepted: February 20, 2013
Published: March 14, 2013
Robert Magnusson, "Flat-top resonant reflectors with sharply delimited angular spectra: an application of the Rayleigh anomaly," Opt. Lett. 38, 989-991 (2013)