ECE280: Nano-Plasmonics and Its Applications

Week10Week10

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