Stretchable Metamaterial Absorber Using Liquid Metal-Filled Polydimethylsiloxane (PDMS). The stretchability was achieved by liquid metal and polydimethylsiloxane (PDMS).  To inject liquid metal, microfluidic channels were fabricated using PDMS powers and microfluidic-channel frames, which were built using a three-dimensional printer.  The proposed metamaterial absorber comprises three layers of PDMS substrate.  Flat PDMS layers were inserted between the top and bottom PDMS layers. 
PDMS
To inject liquid metal, microfluidic channels were fabricated using PDMS powers and microfluidic-channel frames, which were built using a three-dimensional printer. 
microfluidic channels
To inject liquid metal, microfluidic channels were fabricated using PDMS powers and microfluidic-channel frames, which were built using a three-dimensional printer. 
three-dimensional printer
To inject liquid metal, microfluidic channels were fabricated using PDMS powers and microfluidic-channel frames, which were built using a three-dimensional printer. 
PDMS powers
To inject liquid metal, microfluidic channels were fabricated using PDMS powers and microfluidic-channel frames, which were built using a three-dimensional printer. 
microfluidic-channel frames