Hybrid graphene metasurface for near-infrared absorbers

• Published in: Optics express Vol. 27; no. 18; pp. 24866 - 24876
• Main Authors: Rahman, Md Mahfuzur, Raza, Aikifa, Younes, Hammad, AlGhaferi, Amal, Chiesa, Matteo, Lu, JinYou
• Format: Journal Article
• Language: English
• Published: United States Optical Society of America 02.09.2019
• Subjects: Technology: 500; Teknologi: 500; VDP
• ISSN: 1094-4087; 1094-4087
• DOI: 10.1364/OE.27.024866

We experimentally demonstrated an amorphous graphene-based metasurface yielding near-infrared super absorber characteristic. The structure is obtained by alternatively combining magnetron-sputtering deposition and graphene transfer coating fabrication techniques. The thickness constraint of the physical vapor-deposited amorphous metallic layer is unlocked and as a result, the as-fabricated graphene-based metasurface absorber achieves near-perfect absorption in the near-infrared region with an ultra-broad spectral bandwidth of 3.0 µm. Our experimental characterization and theoretical analysis further point out that the strong light-matter interaction observed is caused by localized surface plasmon resonance of the metal film's particle-like surface morphology. In addition to the enhanced light absorption characteristics, such an amorphous metasurface can be used for surface-enhanced Raman scattering applications. Meanwhile, the proposed graphene-based metasurface relies solely on CMOS-compatible, low cost and large-area processing, which can be flexibly scaled up for mass production.