Plasmonics for Ultrasensitive Nanospectroscopy and Optofluidic-plasmonics Biosensors
Antonio García-Martíncmp.physics.iastate.edu/wavepro/program/presentations/Garcia... · 3...
Transcript of Antonio García-Martíncmp.physics.iastate.edu/wavepro/program/presentations/Garcia... · 3...
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Magnetoplasmonics:
fundamentals and applications
Instituto de Microelectrónica de Madrid
Consejo Superior de Investigaciones Científicas
http://www.imm-cnm.csic.es/magnetoplasmonics
Antonio García-Martín
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MAGNETO-PLASMONICS
Systems where constituents with Plasmonic and Ferromagnetic
(Magneto-Optical) properties coexist
Magneto
Plasmonics
Magneto
Plasmonics
http://www.imm-cnm.csic.es/magnetoplasmonics
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Group Members
http://www.imm-cnm.csic.es/magnetoplasmonics
J.V.Anguita
Staff scientistsPhD Students
Post docs
Technician
A.Vitrey
G.Armelles
A.Cebollada
A.Garcia-Martin
J.M.
Garcia-Martin
M.U.Gonzalez
J.C.BanthíJ.Fernandez
R.Fermento
E.Ferreiro
D.Martin
D.MenesesA. Calle
P.Prieto
Prof. E.Muñoz
(visiting scientist)
Staff
(Collaboration)
N. Sousa
B. Caballero
A.Vitrey
J.C.Banthí
J.Fernández
E.Ferreiro
D.Martin
Magnetoplasmonic Activity in Systems with
Localized and Extended Surface Plasmons
Magnetoplasmon interferometry
and sensing applications
Near field studies of
magnetoplasmonic
structuresMulti-mode magnetoplasmonic
nanoresonators
Magnetoplasmonic nanodiscs
-80 -60 -40 -20 0 20 40 60 80y (nm)
-40
-20
0
20
40
60
80
z (
nm
)
00.20.40.60.811.21.41.61.822.22.42.62.833.23.43.6
E
Incident light Magnetic fieldB = B0 sin t
Co
Au
Dielectricoverlayer
Au
MO and SPP k modulation in
continuous layers
Au
AuCo
http://www.imm-cnm.csic.es/magnetoplasmonics
D.MenesesN. Sousa
(Col. MoLE
group @ UAM)
B. Caballero
(Col. Cuevas
group @ UAM)
R.Fermento
MO active dielectrics
Theoretical developments
E. Ferreiro
NS. Coupled diplole method
BC. Scattering Matrix Techniques
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PLASMONICS
Active topic, but not so new …The Lycurgus cup
(British Museum. 4th Century)
When illuminated from outside the cup
appears green, but turns into red when
illuminated from inside.
“Labors of the Months”
(Norwich, England, ca. 1480)
The ruby color is probably due to
embedded gold nanoparticles.
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PLASMONICS
… based on …
“Electromagnetic excitation (TM polarized) localized at the interface between a
media r <0 (metal) and a media r >0 (dielectric material) ”
Main characteristics
Strong localization of EM in subwavelength volumes: Optical nanodevices
Very sensitive to metal dielectric interface: Sensors
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PLASMONICS
… that are excited if …
both frequency and wavevector match those of the SPP (propagating plasmon)
the frequency matches that of the LSPP (localized plasmon)
c
Extra k
Ways to produce the extra k
A prism A grating A defect
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MAGNETO-OPTICS
New effect …
Faraday effect: 1845
1791-1867
Bd
Kerr effect: 1876
Miranda Kerr Lucas Kerr
1824-1907
B
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MAGNETO-OPTICS
… depends on relative orientation of B …
Kerr effect
M
Eεk
x
y
z
M
Eεk
θ0θ0
M
Ek
k
0
0 00
y
y
aM
aM
00
0 0
z
z
aMaM
0 00
0x
x
aM
aM
Polar
+ i = f(Mz)
Transverse
Rpp = f(My)
Longitudinal
+ i = f(Mx)
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MAGNETO-PLASMONICS
Fair plasmonic modes
Good MO activity
Magnetoplasmonic materials
Noble metals: Nice plasmon resonances, too low magneto-optical activity
Ferromagnetic metals: good magneto-optical activity, broad resonances
40 60 80
20
40
60
80
100 22nm Au / 6 nm Co / 6nm Au
50 nm Au
Re
flectivity (
%)
Incident angle
Hybrid ferromagnetic – noble metal systems
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Adv. Mat. 19, 2643 (2007)
Nanoscale Res. Lett. 6, 408 (2011)
Ferromagnetic membranesFerromagnetic nanowiresAppl. Phys. Lett. 94, 062502(2009)
Phys. Rev. B 81, 054424 (2010)
Phys. Stat. Sol. (RRL) 4, 271 (2010)
Plasmonic, magento-plasmonic dotsPhys. Rev. Lett. 104, 147401 (2010)
Small 4,202 (2008)
Opt. Express 16, 16104 (2008)
Appl. Phys. Lett. 97, 043114 (2010)
Opt. Express 18, 15635 (2010)
1.5 2.0 2.5 3.0
1
2
3
4
5
(2+
) NP/(
f*(
2+
) CF)
Energy (eV)
60
110
Peak in the LSPR
spectral region
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Controlling the plasmon
via magnetic fields
Magnetoplasmonic Interferometers
Layer thickness: 200nm
Groove and slit width:200nm
Groove and slit length:15 m
Groove depth:100nm
Co layer thickness: 10nm
V.V. Temnov et al. Nature Photonics 4, 107 (2010)
D. Martin-Becerra, et al., APL 97, 183114 (2010)
V. V. Temnov, Massachusetts Institute of Technology, Cambridge (MA), USA
T. Thomay, A. Leitenstorfer, R. Bratschitsch, University of Konstanz, Germany
U. Woggon, Technical University Berlin, Germany
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Operation principle
•Photons produced by the SP generated at the
groove interfere with incident photons
•Groove and Slit nonparallel: Phase varies
along the slit
50 μm
V.V. Temnov et al. Opt. Exp 17, 8423 (2009)
2 2 2 cos( )ip sp ib sp spI A A A A k d
d
100 nm
200 nm100 nm
GrooveSlit
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Operation principle
V.V. Temnov et al. Nature Photonics 4, 107 (2010)
00
(1 )YMspsp sp
sp
kk k
k
The SP wave vector depends on Co magnetization
2
0
0
2cos(
( ) 2sin
)
( )ip sp ip sp
sp
sp
Y sp
kI M A A A A
d k M k
d
d
The intensity (linear response) has two components:
•Optical
•MO (shifted 90) α d, ΔKsp , M
Co layer
100 nm
200 nm100 nm
GrooveSlit
2 220
2
2 AuCo z
Co
Co d mosp
Au Co
z kt k ik eWe can use a dielectric
with a higher
we add a thin dielectric overlayer
Enhancement factor = 0/d
sp spk k
ksp depends on environment
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D. Martin-Becerra, et al., APL 97, 183114 (2010)
0 150 300 450 600
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
kd sp/
k0 sp
PMMA thickness, tPMMA (nm)
0 = 633 nm
7-fold enhancement of theSPP wavevector modulation
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Funding
National (MICINN,CSIC)
www.nanomagma.org
EU
Regional (CAM)
Crimafot Magplas + Plasmar(EXPLORA)