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HK, May, 2010
Exciton-plasmom interactionExciton-plasmom interactionand eand enhanced energy transfer nhanced energy transfer
in active plasmonic nanosystemin active plasmonic nanosystem
Qu-Quan WANGQu-Quan WANG(( 王取泉王取泉 ))
[email protected] University
activeplasmonic
system
semiconductor QDs(quantum SWAP, dephasing, spin)
spaser
rare-earth NCs(dopant-control phase, ET)
antennaAg nanorod(nonlinear FOM)
Au nanowire(avalanche MPL)
Ag nanoring(focusing, SP amplification)
Optical nanoemitters
(sources)
Metallic nanostructures
(plasmons)
Au-Ag nanocomplex(plasmon Fano resonances)
Our interests:
OutlineOutline
Brief introductionBrief introduction一 , 掺杂调控纳光子发射体的光学特性 1.1. Mn 掺杂半导体量子点的光学特性 1.2. Ln 掺杂调控 NaYF4 稀土纳米晶的晶相和上转换发射效
率二 , 金属纳米结构中表面等离激元 Fano 干涉效应 2.1. Au-Ag 异质纳米棒中双 Fano 共振效应 2.2. 明 - 暗等离激元能量转移与光调制效应三 , 金属表面等离激元与纳光子发射体相互作用 3.1. Ag 纳米颗粒双频天线增强量子点之间非辐射能量转移 3.2. Ag 纳米线阵列增强量子点之间辐射能量转移 3.3. Ag 纳米环可控增强量子点发射与表面等离激元放大 SummarySummary
* Brief introduction* Brief introduction Spaser from two nanosystems: Dye molecule – Au nanoparticle CdS nanorod – Ag thin film
M. A. Noginov et al., Nature 460, 1110 (2009).
Spaser from Au nanoparticles with dye molecules
The activators are dye nanoemitters
Rupert F. Oulton et al., doi:10.1038/nature08364 (2009)
Spaser from Ag thin film with CdS nanowire
The activator is CdS nanowire.
一 , 掺杂调控纳光子发射体的光学特性 1.1 Mn 掺杂半导体量子点的光学特性 1.2 Ln 掺杂调控 NaYF4 稀土纳米晶的晶相和上转换发射
效率
1.1. Mn 掺杂半导体量子点的光学特性ZnSe:Mn/CdSe反核壳量子点中激子极化和存储
磁共振精细结构( EPR )
Mn2+
PL
(Exciton)
Exciton
14 T
|0
|g
|1
CdSeMn2+
ZnSe
ZnSe:Mn/CdSe
共振转移
Mn(2+) PL和激子PL
激发和发射谱的差别
14 T
Mn(2+) PL和激子 PL发射动力学的差别
MnMn 延长延长激子激子 PLPL 寿命寿命
MnMn 增强增强 激子激子 PLPL 强度强度
Appl. Phys. Lett. 96, 123104 (2010)
1.2. Ln 掺杂调控 NaYF4 稀土纳米晶的晶相和上转换发射效率
Nano Res. 3, 51 (2010)
我们的文章发表在 Nano Research 1 月份的封面上,优点是生物相容性2 月份 Nature 上也报道了调控晶相的文章,但没有生物相容性
二 , 金属纳米结构中表面等离激元 Fano 干涉效应 2.1. Au-Ag 异质纳米棒中双 Fano 共振效应 2.2. 明 - 暗等离激元能量转移与光调制效应
2.1 Au-Ag 异质纳米棒中双 Fano 共振效应
Energy transfer between Au and Ag
692 nm
712 nm
786 nm
Au Ag
Appl. Phys. Lett. 96, 131113 (2010)
2.2 明 - 暗等离激元能量转移与光调制效应
Appl. Phys. Lett. 96, 043113 (2010)
三 , 金属表面等离激元与纳光子发射体相互作用 3.1. Ag 纳米颗粒双频天线增强量子点之间非辐射能量转移 3.2. Ag 纳米线阵列增强量子点之间辐射能量转移 3.3. Ag 纳米环可控增强量子点发射与表面等离激元放大
3.3.11.. Plasmon-enhanced nonradiative ET Plasmon-enhanced nonradiative ET between SQDs by using Ag NPsbetween SQDs by using Ag NPs
Physics process: Plasmon-enhanced FRET
ET distance: < 10 nm
Donor/acceptors: SQDs in mononlayer film
Tool: large Ag NPs
Physics effect: Dual-frequency nanoantenna
Dipole and quadrupole SPRs of Ag NPs
3
4
3
4)10(
30
4
3
1
/)()5/2(1
3
4)(
3Ag
3
2/3SiO2
2
2
2Ag
SiO2Ag
2
SiO2Ag
SiO2
22Ag SiO2Ag
23Ag
Ri
R
RR
)()(
)(Size-dependent polarizability of dipole SPRs of Ag NPs:
receivingemitting
by single-frequency nanoantenna by dual-frequency nanoantenna
W/O nanoantennadonor acceptor
without Ag NPs
FRET dynamics from donor to acceptor
with Ag NPs
Appl. Phys. Lett. 96, 043106 (2010)
FRET efficiency
single
frequency
dual-frequency
antenna
3.3.22. . Plasmon-mediated radiative energy transfer Plasmon-mediated radiative energy transfer between semiconductor quantum dotsbetween semiconductor quantum dots
acceptor
SQDs
PLb
laser
donor
SQDs
E
Ag NR array
Physics process: SPP-mediated radiative ET
ET distance: ~ 500 nm
Donor/acceptors: SQDs / SQDs
Tool: Ag NR array
Physics effects: subwavelength imaging(near-field SPP coupling, resonant transmission, subwavelength focusing)
50 nm
130 nm
220 nm
45 nm
130 nm
210 nm
Half-wave plasmon resonances in Ag NR arrays
Ez - polarized point source
Ey - polarized point source
m = 1
m = 3
m = 2
L = mSP/2
3.3. Plasmon amplifications in Ag nanoring3.3. Plasmon amplifications in Ag nanoring
* * Tunable PL enhancement (E)Tunable PL enhancement (E)
* Plasmon amplifications (T)* Plasmon amplifications (T)
C
E
[001]t[110]
SinglyTwinnedCrystal (19.5)
D
BA
Synthesis of singly-twinned Ag nanoring
CdSe SQDs PL enhanced by a Ag nanoring
A
x
PLLaserin
y
Singlenanoring
Monolayer SQDs
60 65 70 75 80 851
2
3
4
5
6
7
8
Rel
ativ
e en
han
cing
fact
or
Incidence angle in
( O)
E
H.M.Gong, et al., Adv.Funct.Mater.19, 298(2009)
a
1k
2m
c
2k1k
b
2k
Tunable “hot spots”
Time-resolved Photoluminescence
pure SQDs
SQDs + nanoring
0 2 4 6 8
5000
6000
7000
8000
Ph
oto
n co
unt
s (a
.u.)
Time delay d(ns)
Plasmon amplification in Ag nanoring
Opt. Express 19, 289 (2010)
Summary
* * Ag nanoparticles Ag nanoparticles enhance nonradiative enhance nonradiative ET efficiently via dual-frequency antenna ET efficiently via dual-frequency antenna effect effect
* Ag nanoring has tunable “hot spot” and * Ag nanoring has tunable “hot spot” and could be used in plasmon amplificationscould be used in plasmon amplifications
* Multiphoton luminescence from the * Multiphoton luminescence from the hybrid of SQDs and AgNRs are tunablehybrid of SQDs and AgNRs are tunable
Acknowledgement
Profs. Q. K. Xue, J. Zi, J. F. Jia Profs. Z. Y. Zhang, Q. H. Gong Drs. X. Y. Shan, Q. Zhang Drs. L. Zhou, H. M. Gong, S. Xiao
X. F. Yu, X. R. Su, Z. K. Zhou
Thank you!