Abstract
A dual-periodic multilayer structure, in which the optical thickness is modulated by a longer periodicity different from a fundamental one of the unit cell, is expected to have a specific optical feature. We fabricated thickness-modulated dual-periodic multilayer films on silica glass substrates by helicon plasma sputtering technique. Transmission spectra for normal incidence of light were measured at room temperature showing an excellent agreement with the theoretical one. It is possible to control the peak wavelength and band width of a transmitted light by designing the thickness and/or refractive index based on the dual-periodicity concept without adding any particular defect layers.
