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Anomalous surface plasmon dispersion in aluminum
Philip Chimento
June 15, 2012
Science
1
91
Anomalous surface plasmon dispersion in aluminum
Talk I gave at Casimir Spring School 2012
Philip Chimento
June 15, 2012
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Transcript
Anomalous surface plasmon dispersion in aluminum Eric Eliel Gert ‘t
Hooft Philip Chimento >ĞŝĚĞŶhŶŝǀĞƌƐŝƚLJͻYƵĂŶƚƵŵKƉƟĐƐ @therealptomato { }
{ Surface plasmons }
Quick explanation of them Surface plasmons Using English literature
in English literature Image: public domain Surface plasmons Dr. Edwin
Abbott Abbott, author of...
“Flatland”
“Flatland” A surface plasmon polariton is what a light wave
would be in Flatland
“Flatland” A surface plasmon polariton is what a light wave
would be in Flatland
Exist on the interface between a metal and a dielectric
Surface plasmons
Can be excited using light, but not directly Surface plasmons
Can be excited using light, but not directly Surface plasmons
A surface plasmon on a metal-air interface has more momentum
than a photon with the same energy in air Surface plasmons
A photon in a denser medium can match the momentum
of a surface plasmon on a metal-air interface Surface plasmons
Attenuated total reflection — “Kretschmann configuration” ATR Coupling
Evanescent waves from the total internal reflection cross the metal
and couple to plasmons on the other side ATR Coupling
{ That was easy }
It’s a question of “the least bad” Metals for plasmonics
Aluminum is one of the “least bad” Metals for plasmonics
Rakic et al., Appl. Opt. 37, p. 5271 (1998) Aluminum
has an interband transition that absorbs at 800 nm Aluminum
E ective mode index of plasmons on an aluminum surface
Aluminum plasmons īĞĐƟǀĞ^WŝŶĚĞdž
have a region of anomalous dispersion Aluminum plasmons īĞĐƟǀĞ^WŝŶĚĞdž Anomalous
dispersion
Experiment Exciting plasmons on aluminum by ATR coupling ϱŶŵ^ŝ 3
N 4 ƉƌŽƚĞĐƟŽŶůĂLJĞƌ ϳ͕ϵ͕ϭϮ͕ϭϯŶŵů <ϳŐůĂƐƐ
Measure reflection as a function of angle Experiment
^ŽƵrĐe DeteĐtŽr ɽ ɽ
We measure hundreds of one-wavelength curves like these... Experiment
...to get a dispersion curve like this Experiment īĞĐƟǀĞ^WŝŶĚĞdž
The results were less than inspiring for a 9 nm
layer Plasmon dispersion
For a 12 nm layer, the dispersion was anomalous but
less than expected Plasmon dispersion īĞĐƟǀĞ^WŝŶĚĞdž
Novotny et al., J. Nanophotonics 5 (2011) Thin-layer aluminum doesn’t
have the same optical properties as bulk aluminum What’s going on? ďƵůŬ
Thicker aluminum layer behaves more like bulk aluminum, but diminishes
the ATR e ect How to fix it?
Thicker aluminum layer behaves more like bulk aluminum, but diminishes
the ATR e ect How to fix it? The evanescent waves evanesce before they reach the top
You have to be crazy to do it, but: the
Otto configuration How to fix it?
Crazy? Relative size of a dust particle, 20 µm Gap
size, 1 µm
Luckily, that problem is solvable How to fix it? ŚŝŐŚͲŝŶĚĞdžĚŝĞůĞĐƚƌŝĐ
ůŽǁͲŝŶĚĞdž ĚŝĞůĞĐƚƌŝĐ
{ Thanks } Fruitful discussions Michiel de Dood Wolfgang Lö
er Kind assistance Daan Boltje Klara Uhlirova