Multi-spectral programmable absorbers

2021/06/13 by Yun Meng, Meng, Yun, Dan Li +9
Computer Science · Materials Science · Engineering · #Neural Networks and Reservoir Computing #Phase-change materials and chalcogenides #Photonic and Optical Devices

paper · pdf · doi:10.48550/arxiv.2106.06940

Abstract

We designed and demonstrated a multi-spectral programmable perfect absorber that exploits two different phase-change materials. This programmability is possible by resonantly coupling two phase change materials, a Ge2Sb2Te5 layer to vanadium dioxide nanoparticles (VO2 NPs). The perfect absorption is attributed to the coalescence of gap plasmon modes excited between the NPs and waveguide cavity-like modes excited between the film and the NPs. The absorptance peak (>90%) can be tuned to four different infrared (IR) wavelengths from 1906 to 2960 nm by heating the structure to different temperatures. The perfect absorber is reconfigurable, lithography-free, large-scale, polarization-insensitive omnidirectional. Our strategy opens a new path for programmable infrared photonics.

Related

• Electrically reconfigurable nonvolatile flatband absorbers in the mid-infrared with wide spectral tuning range
• Broadband switchable infrared absorbers using phase-change materials
• Double tunable metamaterial perfect absorber
• Design of Tunable Perfect Absorbers in the Mid-IR Spectrum Using Graphene-Based Multilayer Structures: Emerging Applications in Atmospheric Window Matching
• Port Reconfigurable Phase-Change Optical Resonator