Optical reflectionless potentials for broadband, omnidirectional antireflection

Reflectionless potentials (RPs) represent a class of potentials that offer total transmission in the context of one dimensional scattering. An optical realization of RP can exhibit a truly broadband omni-directional antireflection. We report our experimental observations confirming the reflectionless behavior. Stratified media conforming to RP's are designed and fabricated using Al2O3 and TiO2 heterolayers. They showed < 0.5% reflection over the broad wavelength range of 350 nm to 2500 nm for angles of incidence 0-50 degrees. These RPs can be designed on substrates and are thus interesting for optical instrumentation as broadband, omnidirectional antireflection coatings. © 2014 Optical Society of America.