Our work on thermal metamaterials is now highlighted by Philip Ball in , News and views, Nature Materials. You can find the article here.

The main thrust of the view is inverting  thermal diffusion in a thermal gradient using thermal metamaterials.

The pictures shown below is one that can illustrate what I am talking about. There is a gradient  from left to right, but within our metamaterial shell, we observe the gradient to be from right to left. The metamaterial device is constructed out of isotropic materials arranged in a spiral fashion( derived by coordinate transformation) to form the anisotropic device. 

Image

Image

This is a experimental demonstration of thermal metamaterial.

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Our article on thermal metamaterials is now featured online by
physics today.  The link is here.

 

 

Our article , titled “Heat flux manipulation with engineered thermal materials” that will be published in PRL shortly, has been featured in sciencenow.  The titled in the news article is titled ” Heat Trickery Paves Way for Thermal Computers” which gives a brief description of thermal shielding, concentration and inversion. 

The link to the sciencenow article is here. 

The concept of heat has been known for a long time, and yet it is nontrivial to manipulate its flow. Here, we show that artificial materials can be engineered to guide the heat flow in unconventional ways. The conductivity of the artificial materials are engineered for diffusive energy transport of thermal conduction and experimentally shielding, concentrating, and inverting the applied heat flux.

The artificially engineered materials are otherwise known as metamaterials.

I will upload more details once the paper is published.

The acceptance notice is here.


We designed and tested a dc magnetic field cloak. We showed that, when
 the external dc magnetic field is applied, the interior of the
 cloak is shielded while the field outside remains unperturbed.
we used a metamaterial composed of artificially patterned superconducting
and paramagnetic elements.
The picture shows the cloak along with the setup used for the demonstration.

I will upload the paper once it is released. 

references

1.  DC magnetic cloak
S. Narayana and Y. Sato, Advanced Materials, In press.

2. Wood, B. & Pendry, J. B. Metamaterials at zero
 frequency. J. Phys. Condens. Matter 19, 076208 (2007).

3.Magnus, F. et al. A d.c. magnetic metamaterial. Nature
 Materials 7, 295-297 (2008).

4.Navau, C. et al. Magnetic properties of a dc
 metamaterial consisting of parallel square 
superconducting thin plates. Appl. Phys. Lett.
 94, 242501 (2009).