•Symmetry-breaking allows for the excitation of previouslydark modes, which appear in optical response

• All complex plasmonic structures support both bright anddark modesStockman, M. I.; Faleev, S. V.; Bergman, D. J., PRL 2001, 87, 167401.

•These new resonances can interact and support coherentcoupled-oscillator physics: EIT, Fano Resonances, Sub- andsuperradiance (atomic physics redux!)

New routes to reduced-symmetryNew routes to reduced-symmetryplasmonicsplasmonics

Naomi J. HalasNaomi J. HalasLaboratory for Nanophotonics (LANP)

Rice University, Houston, TX, USA

Nanoshell to Nanoegg to NanocupNanoshell to Nanoegg to Nanocup

)/( 12 rroffsetD !=

Mark Knight and N. J. Halas, N. J. Phys. 10, 105006 (2008).

COMPLEX to REDUCED SYMMETRY to ELEMENTARY nanostructure

0.6 0.7 0.8 0.9 1.0 1.1 0.6 0.7 0.8 0.9 1.0 1.1

Ext

inct

ion

(a.u

.)

0.2

0.4

0.6

0.8

1.0D

1.2

1.4

1.6

1.8

2.0

Wavelength (µm) Ext. Peak Wavelength (µm)

Controlled ablation of individual plasmonic nanoparticlesControlled ablation of individual plasmonic nanoparticles

Electron beam*

Au, SiO2removed

Nanoshell Nanoegg Nanocup

J. B. Lassiter et al., Nano Letters, articles ASAP

400 500 600 700 800 9001000

No

rmalized

Scatt

eri

ng

(a. u

.)

Wavelength (nm)

400 500 600 700 800 9001000

No

rmalized

Scatt

eri

ng

(a. u

.)

Wavelength (nm)

i

ii

iii

iv

v

vi

A

100 nm

i

ii

iii

iv

v

viB

NS

NE

NC

Plasmonic Nanocup ModesPlasmonic Nanocup Modes

Light-bendingNanoparticles!

Nikolay Mirin and N. J. Halas, “Light-bending Nanoparticles”, Nano Letters 9, 1255-1259 (2009)