Tailored metamaterial perfect absorber

Complete absorption of light which has been recently demonstrated in metamaterials has drawn the attention of the scientists because of its potential application in harvesting energy and sensors. Controlling the absorption band-width, peak position and intensity are some of the essential factors in metamaterial absorbers. Although many reports showed the metamaterial with high absorption in broad range of spectrum, strong tuning the absorption band-width has been rarely shown. In this work, we show that using three component (Au, TiO₂ and SiO₂) nanocomposite deposited on an optically thick gold film through simultaneous sputtering, one can broaden the band-width and peak position to span UV up to NIR.