Excitation of surface plasmons with a scanning tunneling microscope
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Excitation of surface plasmons with a scanning tunneling microscope Tao Wang, Elizabeth Boer-Duchemin, Yang Zhang, Geneviève Comtet, Gérald Dujardin ISMO, ORSAY Projet ANR/PNANO « Nanosources de photons ». 1. ω =ck 0. k SPP. Surface Plasmon Polariton. Surface plasmon polariton (SPP):

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Excitation of surface plasmons with a scanning tunneling microscope

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Excitation of surface plasmons with a scanning tunneling microscope

Tao Wang, Elizabeth Boer-Duchemin, Yang Zhang, Geneviève Comtet, Gérald Dujardin

ISMO, ORSAY

Projet ANR/PNANO « Nanosources de photons »

1


ω=ck0

kSPP

Surface Plasmon Polariton

Surface plasmon polariton (SPP):

EM wave confined at Metal-dielectric interface,

coupled with oscillation of surface charges

D

ω0

z

x

M

kspp > k0

λSPP <λ0, Beat the diffraction limit !

2


Motivation

Our experiment: surface plasmon excitation with a scanning tunneling microscope

Surface plasmon excitation: usually with light

laser

k0

STM tip

Kspp

Kspp

Kspp

Kspp

e-

Our experiment isto dolocal electrical excitation of surface plasmons on a gold film by STM as a nanosource of photons.

3


Experiment setup

STM head

Inverted optical microscope

4


Experiments

Experiment 1: thin gold film (35nm)

Experiment 2: thin gold film (35nm) with gold nanoparticles(NPs)

Experiment 3: thick gold film (200nm) with holes


Experiment 1: STM excited on thin gold film (35nm)

Image plane image with oil objective

oil objective100X, NA=1.45

W tip, 2.5V, 6nA

10 μm

Image plane

Surface plasmon propagates on the gold film

6

Gold films deposition in IEF CTU, Orsay


Experiment 1: STM excited on thin gold film (35nm)

Fourier plane

f

f

Fourier plane

R

R=n×sin (θ)×f

7


Experiment 1: STM excited on thin gold film (35nm)

Fourier plane images with oil objective

oil objective100X, NA=1.45

W tip, 2.5V, 6nA

kspp

nk0

θspp

R

Surface plasmons emit at large angles (related to leakage radiation coupling)

Fourier plane

Coupling condition : kspp=nk0 sin(θspp)

kspp›k0, sin(θspp)=kspp/nk0›1/n, θspp›critical angle

8


Experiment 1: STM excited on thin gold film (35nm)

Spectra measurement


Experiment 1: STM excited on thin gold film (35nm)

Conclusion

STM can excite propagating surface plasmon on the gold film (broad spectra band)

Propagating surface plasmons emit at large angles

This will be published on nanotechnology soon.


Experiment 2: thin Au film (35nm) with Au NPs

STM topography image (9μm×9μm)

500nm

NP1

Tip position

NP2

NP1

NP2

Collaboration with Prof. Hynd Remita (LCP, Orsay)


Experiment 2: thin Au film (35nm) with Au NPs

Preliminary results

image plane image 9μm×9μm


Experiment 2: thin Au film (35nm) with Au NPs

Preliminary conclusion

STM excite propagating surface plasmon

on the gold film

Propagating surface plasmon scattered

by the Au NPs


Experiment 3: thick gold film (200nm) with nanoholes

STM Topography image (6μm×6μm)

3μm

Collaboration with Serge Huant (Néel, Grenoble)


Experiment 3: thick gold film (200nm) with nanoholes

Preliminary results

STM excited light emission image

5μm


Experiment 3: thick gold film (200nm) with nanoholes

Preliminary conclusion

STM excite propagating surface plasmon

on the gold film

Propagating surface plasmon scattered

by the nanoholes


Conclusions and future work

Experiment 1: thin gold film (35nm)

Experiment 2: thin gold film (35nm) with gold nanoparticles(NPs)

Experiment 3: thick gold film (200nm) with holes


Thank you for your attention!

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