ming-yaw ng and wei-chih liu department of physics, ntnu
DESCRIPTION
From 4.7GB to 100 GB -- Theoretical study of the AgO x -type super-resolution near-field structure. Ming-Yaw Ng and Wei-Chih Liu Department of Physics, NTNU. Outline. Introduction Working mechanisms of the AgO x -type super-resolution near-field structure (Super-RENS) Simulation results: - PowerPoint PPT PresentationTRANSCRIPT
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From 4.7GB to 100 GB -- From 4.7GB to 100 GB -- Theoretical study of the AgOTheoretical study of the AgOxx-type -type
super-resolution near-field structuresuper-resolution near-field structure
Ming-Yaw Ng and Wei-Chih LiuMing-Yaw Ng and Wei-Chih Liu
Department of Physics, NTNUDepartment of Physics, NTNU
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OutlineOutline
IntroductionIntroductionWorking mechanisms of the AgOWorking mechanisms of the AgOxx-type sup-type sup
er-resolution near-field structure (Super-REer-resolution near-field structure (Super-RENS)NS)
Simulation results:Simulation results: random nanoparticles in AgOrandom nanoparticles in AgOxx layer layer
periodic nanoparticles in AgOperiodic nanoparticles in AgOxx layer layer
frequency dependence of the AgOfrequency dependence of the AgOx x –type Super-RENS–type Super-RENS
ConclusionsConclusions
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http://www.nano.gov
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1980 1990 2000 2005 2010MB
GB
TB Advantages capacity >100 Giga Byte
>20 DVD movies
>100部中國 25史 >150 music CD
CD/650MBTrack Pitch=1.6mPit Length=0.83m
7 CDs
> 150 CDs
50 CDs HD-DVD/25GBTrack Pitch=0.35mPit Length=0.2m
Super-RENS disk >100GB
Pit Length < 0.1m
Comparison of optical disks
DVD/4.7GBTrack Pitch=0.74mPit Length=0.4m
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Optical diffraction limit 0.66numerical aperture NANA
Near-field optical data storage
systems
(?)
Far-field optical data storage
systems
(CD-R, CD-RW, DVD….)
Mark size
200 nm
100 nm
50 nm 1000 nm
400 nm
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物理雙月刊(廿三卷二期) 2001 年 4 月
recording
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ZnS-SiO2 AgOx ZnS-SiO210nm
TEM image of cross-section of the AgOx-type Super-resolution near-field structure
(Super-RENS) disk
Silver nanoclusters
W.-C. Liu, C.-Y. Wen, K.-H. Chen, W. C. Lin, and D. P. Tsai, Appl. Phys. Lett. 78, 685 (2001).
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Mark size > λ
Focusing laser beamNA = 0.6
marks
Mark size < λ
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Focusing laser beamNA = 0.6
Mark size < λ
marks
AgOx (15nm)
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DVD disk substrate
ZnS-SiO2 (20 nm)
ZnS-SiO2 (20 nm)
AgOx (15 nm)
Ge2Sb2Te5 (15 nm)
Recording mark
Ag nanoclusters
Focusing laser beam
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TM modeTM mode
Localized surface plasmon of the AgOLocalized surface plasmon of the AgOxx –type –type
Super-RENS with silver nanoparticlesSuper-RENS with silver nanoparticles
TE modeTE mode
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Far-field difference signals of the AgOFar-field difference signals of the AgOxx-type -type
Super-RENS disks with random silver Super-RENS disks with random silver nanoparticlesnanoparticles
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Nonlinear optical response from random silver nanoparticles
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Near-field images of AgONear-field images of AgOxx-type Super-RENS -type Super-RENS
disks with periodic silver nanoparticlesdisks with periodic silver nanoparticlesPeriod = 150 nmPeriod = 150 nm
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Far-field difference signals of the AgOFar-field difference signals of the AgOxx-type -type
Super-RENS diskSuper-RENS disk
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Optical constant of bulk silverOptical constant of bulk silver
‘Handbook of Optical Constants of Solids’, Ed. By Edward D. Palik, Academic Press, Inc., (1985)
n = 0.14 k = 4.15 for λ= 650 nm
n = 0.17 k = 1.95 for λ= 405 nm
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Near-field images of the AgONear-field images of the AgOxx-type Super--type Super-
RENS disks with silver nanoparticlesRENS disks with silver nanoparticles
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Far-field difference signals of the Far-field difference signals of the AgOAgOxx-type Super-RENS disk-type Super-RENS disk
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Far-field difference signals of the Far-field difference signals of the AgOAgOxx-type Super-RENS disk-type Super-RENS disk
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Scattering efficiency of single silver nanoparticleScattering efficiency of single silver nanoparticle
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ConclusionsConclusions Super-RENS was a multilayered structure , which could achieve Super-RENS was a multilayered structure , which could achieve
resolution beyond optical diffraction limit.resolution beyond optical diffraction limit. The AgOThe AgOxx layer of the AgO layer of the AgOxx-type Super-RENS scattered the in-type Super-RENS scattered the in
cident Gaussian beam and enhanced the localized surface plasmcident Gaussian beam and enhanced the localized surface plasmons.ons.
The AgOThe AgOxx-type Super-RENS disks could transfer the evanescent -type Super-RENS disks could transfer the evanescent light from sub-wavelength recording marks into propagation liglight from sub-wavelength recording marks into propagation light.ht.
The far-field signals of specific mark size could be controlled bThe far-field signals of specific mark size could be controlled by periodic silver nanoparticles or nanoclusters.y periodic silver nanoparticles or nanoclusters.
The silver nanoparticles with highly scattering efficiency in AgThe silver nanoparticles with highly scattering efficiency in AgOOxx layer of the AgO layer of the AgOxx– type Super-RENS disks have better resol– type Super-RENS disks have better resolution capability even though it is illuminated with incident light ution capability even though it is illuminated with incident light of longer wavelengthof longer wavelength