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ECE280: Nano-Plasmonics and Its Applications Week10 Week10 Other Topics Other Topics
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ECE280: Nano-Plasmonics and Its Applications
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Other TopicsOther Topics
Other TopicsOther Topics
• Plasmonic nanofocusing • Tunable plasmonics• Optical cloaking
Plasmonic Nanofocusing Plasmonic Nanofocusing
..
r2
r3
.
rn
r1
f=80μmf=80μm
λ=1.55μm
+1
0
-1
x (μm)00 -50 0 50 100
θ=20°
(c)A
B
CD
Appl. Phys. Lett. 88, 171108 (2006)
Nano. Lett. 5, 1399 (2005)
Appl. Phys. Lett. 91, 081101 (2007)
Plasmonics at nanoscalePlasmonics at nanoscale
Dimple LensDimple Lens
Eli Yablonovitch’s group
Experimental Demonstration Experimental Demonstration
Other Plasmonic Focusing MethodsOther Plasmonic Focusing Methods
7 January 2008 / Vol. 16, No. 1 / OPTICS EXPRESS 45
Nano. Lett. 2009Phys. Rev. Lett. 93, 137404, 2004
Active Plasmonics Active Plasmonics
A SPP gold-on-silica waveguide containing a gallium switching section. The metallic film is at the bottom of the silica substrate. Field mapping showsthe magnitude of the z component of the magnetic field.
The switching may be achieved by either changing the waveguide temperature or by external optical excitation.
Tunable Plasmonic LatticeTunable Plasmonic Lattice
InvisibilityInvisibility
Causes of invisibility:
1. So massive that its escape velocity exceeds the speed of light (black holes).
2. Transparent (such as air and many other gases)
3. Emitting or reflecting light outside the wavelength range of visible light.
4. Light goes around the object in a special media
Star Trek
Harry Potter
Camouflage Camouflage
A Similarity in Mother Nature A Similarity in Mother Nature
The bending of light due to the gradient in refractive index in a desert mirage
Mirror Tricks Mirror Tricks
http://en.wikipedia.org/wiki/Invisibility
RetroRetro--reflective Projection Technologyreflective Projection Technology
http://projects.tachilab.org/rpt/
Metamaterial Cloak at Microwave Metamaterial Cloak at Microwave
Broadband GroundBroadband Ground--Plate CloakPlate Cloak
Complementary MediaComplementary Media
c=r1, b=r2, a=r3
Cloak Objects at a DistanceCloak Objects at a Distance
