Broadband Optical Absorber Based on Nanopatterned Metallic Glass Thin Films

Applications of metallic glass thin films (MGTFs) in the optical area have seldom been reported. We successfully design and fabricate a broadband and durable absorber with MGTFs. It is found that the absorber, with a total thickness of only ∼230 nm smaller than the light wavelength, exhibits excellent performance, that is, an average absorption of >90% from the visible to the near-infrared range (500-1300 nm). This is of significance for the optical application of MGTFs with the potential for large-scale fabrication using superplastic deformation in the supercooled liquid region of MGTFs.