ASET Colloquium
Metamaterials : The Power of Negative Thinking
by Dr. Sushil Mujumdar (DNAP, TIFR)
Friday, April 23, 2010
from
to
(Asia/Kolkata)
at Colaba Campus ( AG-66 )
at Colaba Campus ( AG-66 )
Description |
Boosted by the advent of nanotechnology, opticists have managed to create materials that have drastically changed our beliefs towards routine optical phenomena. For instance, photonic crystals allow us to control the flow of light, stop it, store it, or bend it around sharp turns without loss. Plasmonic materials can transmit optical signals through regions much smaller than its wavelength, assisted by electronic oscillations called plasmons. In recent times, another category of such materials, called Metamaterials, has revealed several astounding optical effects, most notable among them being the negative refraction of light and invisibility cloaking. Using these meta-materials, it is now possible to send light into a no-entry zone, make it turn around objects and focus it into regions much smaller than earlier reckoned possible. Such materials have immense technological applications ranging from the medical to the military. In this talk, I shall introduce the fundamentals of metamaterials. After giving a brief history of their evolution, I shall discuss a few relevant phenomena like negative refraction, superlensing, hyperlensing and invisibility cloaking. |
Organised by | ASET Forum |