Optical cloaking

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Transcript of Optical cloaking

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490 : .

.. 3304 Optical cloaking/metamaterials

Invisibility in fiction .

tricks!

.

Camouage

, !

!

Science blends in

...

0 1 /

~ Effective medium Structure dominates. Properties described Description using properties determined using geometrical opticsMaxwell equations by diffraction and ray tracing with , , n, Z interferenceExample:Optical crystals Photonics crystals Lens systemsMetamaterials Phased array radar Shadows

? , .

/ .

, ... (~cm) . (~500 nm) . , , , !

Invisibility vs Stealth Invisibility ~ 0 % Stealth technology / / ~ 50%

cloaking .Scattering cancellation (active)Coordinate transformation (passive)Transmission-line techniqueSuper lensing (Pendry 2005)

/ = Transformation optics

Scattering cancellation

Split-ring resonator (SRR)

Scattering cancellation / ( 3 )

: .

Coordinate transformation ! . . .

?

?

?

2D .

~10 cm

TE

Coordinate transformation : . Faraday (Passive device) : (narrow bandwith)2D .3D Chirality occurs

Future applications ! .. ,

RI

..

Referenceshttp://www.nature.com/srep/2014/140410/srep04644/full/srep04644.htmlhttp://arxiv.org/pdf/0907.0263.pdfhttp://web.it.kth.se/~min/files/PIO_Cloaking.pdfhttp://arxiv.org/pdf/0712.1694v2.pdfhttp://en.wikipedia.org/wiki/Refractive_indexhttp://www.slideshare.net/AbhinavSagar/optical-camouflage-abhinavppthttp://www.phy.cuhk.edu.hk/itp/v3/onmii/file/Chan%20Che%20Ting.pdfhttp://www.materials.uoc.gr/el/undergrad/courses/ETY490/notes/2013/lecture_10.pdf