When the administration is supportive of innovations, India has no shortage of talents in espousing Aatma Nirbhar goals. One such feat has recently achieved by the Indian scientists. India’s scientists have been successful in designing a metal mesh structure instead of continuous film on desired transparent substrates to make a transparent shield for electromagnetic interference (EMI).
What is the Significance of this Feat?
The invisible shield can be used in various military stealth applications and can cover electromagnetic wave emitter or absorber devices without compromising their aesthetics.
Some of the threats faced by military assets from electromagnetic interference are: High-altitude nuclear electromagnetic pulse, High-power microwave weapons, E-bombs etc. One needs to have appropriate protections to assess and aver EMI threats. There are metal film protections designed for this purpose which are in use.
So, what value does this new invention add to the EMI shield?
In the words of scientist Dr. Ashutosh K Singh, “this invention has the potential to satisfy the huge demand for highly effective transparent and flexible EMI shields, which can cover electromagnetic wave emitter/absorber devices without compromising their aesthetics.”
Scientists from Centre for Nano and Soft Matter Sciences (CeNS), Bengaluru, an autonomous institute of the Department of Science & Technology (DST), Govt of India have 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.
The statement explained: Instead of continuous film of metal (Cu) coating on any transparent substrate (glass, PET) where transparency can be compromised. In this method, the CeNS team has deposited metal mesh networks on the substrate, which covers only 7% area of substate, unlike 100% coverage of continuous film. This makes metal mesh transparent compare to continuous metal film. Metal mesh provides better electromagnetic shielding compare to same thickness of continuous metal film where transparency can be compromised.
This metal mesh can be created on any desired substrates such as acrylic, polycarbonate, glass, etc. without compromising the conductivity of the electrodes.