Human Transparency

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The slides were prepared by Sahil Jain at IIIT-Delhi.
It deals with the various methods by which human transparency can be achieved. The various research that have been going on in different parts of the world have been depicted.

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Human Transparency

  1. 1. Human Transparency Presentation by: Sahil Jain IIIT-Delhi
  2. 2. What if you could simply throw on a cloak and disappear from sight?
  3. 3. Human Transparency (Invisibility Cloak) We know about the invisible cloak that Harry Potter has. Ever dreamt of having one in your wardrobe?? May be its possible !!!!
  4. 4. The Mirage Effect: Carbon Nanotubes  Mirage Effect: The refraction swings the light rays up toward the viewer’s eyes instead of bouncing them off the surface.  Carbon Nanotubes: Sheets of carbon wrapped up into cylindrical tubes barely as thick as a molecule These sheets are also excellent conductors of heat, making them ideal mirage-makers.
  5. 5.  Sheets were heated electrically  This transferred the heat to the surrounding area (a petri dish of water).  This caused light to bend away from the carbon nanotube sheet, effectively cloaking anything behind it with invisibility.  Practically not yet possible, but the experiment shows the potential for such materials.
  6. 6. Metamaterials: Bending Light Waves  Tiny, artificial structures  Smaller than the wavelength of light  Exhibit negative electromagnetic properties  Natural materials all have a positive refractive index  If we alter the structure of a material on a small enough scale, we can force a switch from positive to negative refraction
  7. 7. Optical Camouflage: Altered Reality  Coat made from retro- reflective material  Covered with thousands and thousands of small beads  When light strikes one of these beads, the light rays bounce back exactly in the same direction from which they came.  The glass beads act like prisms, bending the light rays by refraction.
  8. 8. One way to make a person appear transparent
  9. 9.  A digital video camera captures the scene behind the person wearing the cloak.  The computer processes the captured image and makes the calculations  The projector receives the enhanced image from the computer and shines the image onto the combiner.  The silvered half of the mirror bounces the projected image towards the person wearing the cloak.  The cloak acts like a movie screen, reflecting light directly back to the source.  Light rays bouncing off the cloak pass through the transparent part of the mirror and fall on the user's eyes
  10. 10. Useful Links  http://www.youtube.com/watch?v=PD83dqSf C0Y  http://www.newscientist.com/article/dn13156 -acoustic-superlens-could-mean-finer- ultrasound-scans.html  http://www.newscientist.com/data/doc/article /dn19554/instant_expert_7_- _metamaterials.pdf  http://www.wired.com/wired/archive/11.08/p wr_invisible_pr.html
  11. 11. Thank You

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