News Excerpt
Scientists from the Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru have designed a transparent shield for electromagnetic interference (EMI) which the government calls an ‘invisible’ shield.

Highlights
•    In a novel innovation, Indian scientists have designed a metal mesh structure to construct a transparent shield against EMI.
•    Scientists from Centre for Nano and Soft Matter Sciences(CeNS), Bengaluru, an autonomous institute of the Department of Science & Technologyhave fabricated these transparent and flexible EMI shields made of metal meshes using the crack templating method via spray coating which is pioneered in their laboratory.These can be used instead of a continuous film coating on the desired substrates or surface.
•    The CeNS team has developed a copper metal mesh on a polyethylene terephthalate (PET) sheet as its substrate, which is claimed to have exhibited a visible transmittance, a parameter of visible transparency, of about 85%.
•    Instead of a continuous film coating of a metal like copper on any transparent substrate such as glass or PET, where transparency can be compromised,CeNS team deposited metal mesh networks on the substrate, which covered only 7%of the substrate’s area. This metal mesh can be created on any desired substrates such as acrylic, polycarbonate, glass, etc. without compromising the conductivity of the electrodes.
•    This makes metal mesh transparent compared to the continuous metal film that covers the entire area of the substrate. A metal mesh is said to provide better electromagnetic shielding compared to the same thickness of the continuous metal film.

Uses
•    This ‘invisible’ shield can be used in various military stealth applications and can cover electromagnetic wave emitter or absorber devices without compromising aesthetics.
•    Besides the physical shape, reducing the electromagnetic signature, which includes radar waves and radio signals, is an important element for enhancing the stealth capability of a weapon platform.