Low Cost Metasurfaces



Metasurfaces are the 2-D complement of  metamaterials. These are artificial materials that have very unusual characteristics. Metasurfaces also have a laundry list of innovative  uses. 

The surfaces are prepared with pre-engineered patterning. They are said to change the generation of electromagnetic waves across the full spectrum of wavelengths. 

The search for metamaterials started in metal-dielectric systems. They have all since gone dielectric. They are important in optoelectronic devices like solar cells and LEDs to improve efficiency. 

Professor R. Vijaya works at the Photonic Laboratory of the Indian Institute of Technology Kanpur. He used a low-cost soft lithography technique to create dielectric metasurfaces of two shapes that are complimentary. 

The nanodimples and nanobumps were crafted on a flexible polymer substrate. 

The work was published in Frontiers of Optoelectronics. It is entitled “Control of visible-range transmission and reflection haze by varying pattern size, shape and depth in flexible metasurfaces.” 

The scientists used a low cost crystal that is nanometric in size. This is a unique approach to create flexible, thin, patterned and easy to laminate metasurfaces.

The researchers used varying pattern sizes and depths. The experiments on total reflection and transmission had significant results. They found these samples can be controlled throughout the visible range. 

This is helpful in improving the efficiency of optical-to- electric devices. The optical to electrical conversion efficiency gets restricted due to the linear direction of light.

Simulated results based on these original methods reinforce the experimental findings. 

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