2.76 / 2.760 lecture 6: micro-nano-stm · pdf file2.76 / 2.760 lecture 6: micro-nano-stm...
TRANSCRIPT
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2.76 Multi-scale System Design & Manufacturing
2.76 / 2.760 Lecture 6: Micro-Nano-STMMicro-scaling
Nano-scaling
STM project
X actuator
Y actuator
Z actuator
Flexurestages
10cm
SPM2.76 STM surface sensing
0
2
4
6
8
0 2 4 6 8Gap [Angstroms]
i tunnel
[nA
]
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2.76 Multi-scale System Design & Manufacturing
Nano
Micro
Meso
Macro
NanoNano
NanoMicro
NanoMeso
NanoMacro
MicroNano
MicroMicro
MicroMeso
MicroMacro
MesoNano
MesoMicro
MesoMeso
MesoMacro
MacroNano
MacroMicro
MacroMeso
MacroMacro
Nano
Micro
Meso
Macro
I
I
I
I
SRfSRfSRfSRf
SRfSRfSRfSRf
SRfSRfSRfSRf
SRfSRfSRfSRf
O
O
O
O
⋅
⎟⎟⎠
⎞⎜⎜⎝
⎛⎟⎟⎠
⎞⎜⎜⎝
⎛⎟⎟⎠
⎞⎜⎜⎝
⎛⎟⎟⎠
⎞⎜⎜⎝
⎛
⎟⎟⎠
⎞⎜⎜⎝
⎛⎟⎟⎠
⎞⎜⎜⎝
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⎞⎜⎜⎝
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⎞⎜⎜⎝
⎛
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⎞⎜⎜⎝
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⎞⎜⎜⎝
⎛⎟⎟⎠
⎞⎜⎜⎝
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⎞⎜⎜⎝
⎛
⎟⎟⎠
⎞⎜⎜⎝
⎛⎟⎟⎠
⎞⎜⎜⎝
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⎞⎜⎜⎝
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⎛
=
44434241
34333231
24232221
14131211
Purpose of today
Finish micro-scale gain factors
Nano-scale phenomena (to be cont.)
STM project start
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2.76 Multi-scale System Design & Manufacturing
Micro-scale systems
cont.
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2.76 Multi-scale System Design & Manufacturing
Micro-scale physicsFor strong dependence on characteristic
length, importance of phenomena decreases with characteristic dimension
Body L3
For weaker dependence on characteristic length, phenomena become dominate at small scale
Electrostatic L2
Thermal LSurface tension L2
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2.76 Multi-scale System Design & Manufacturing
Micro-scale physics: Electrostatic
LFF
Body
Electric 1~
dzdUF zElectric −=−z
VLLU ozElectric ⋅
⋅⋅⋅=− 2
2ε2
22
2 zVLF o
zElectric ⋅⋅⋅
=−ε
3VFbody ⋅= ρ
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2.76 Multi-scale System Design & Manufacturing
Micro-scale physics: ThermalHow does thermal physics scale (small Bi #)?
inf
inf
inf TTTTe
initial
tcVAh
−−
==⎥⎦
⎤⎢⎣
⎡⋅⎟⎟⎠
⎞⎜⎜⎝
⎛⋅⋅
⋅−
θθρ
ConductionConvection
kLhBi ~⋅
=
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2.76 Multi-scale System Design & Manufacturing
Micro-scale physics: Dynamics
( ) ( )( )FED
CBA
n whLfwhLfE
VfE
mk
,,,,topology~
⋅⋅
→⋅
⋅=
ρρω
FEDCBA −−−++=α
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2.76 Multi-scale System Design & Manufacturing
Micro-scale physics: DynamicsHow does natural frequency scale?
( ) ( )( )FED
CBA
n whLfwhLfE
VfE
mk
,,,,topology~
⋅⋅
→⋅
⋅=
ρρω
1233 3
33
hwE
LFIE
LF⋅
⋅⋅=
⋅⋅=δ
m0.1 m
[ ]LCLhwE
ddFk ⋅
⋅⋅== 13
3
~12δ
[ ]32~10 LCwhLm ⋅⋅⋅⋅⋅= ρ
⎥⎦⎤
⎢⎣⎡→⋅≈=LL
LCmk
n1
33ω
L
w
h
~-3 ~3 ~1
~1 ~1 ~1
2−=α
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2.76 Multi-scale System Design & Manufacturing
Micro-scale physics: FluidicsHow do fluid-based physical phenomena scale?
High pressure change over narrow flow paths…
Reynolds number
D = 50 µm U = 500 µm/s L = 1000 µm
ReAir and ReH2O << 1
Heavily damped, limits response time (ms vs. µs)
LprQ
⋅⋅∆⋅⋅
=µ
π8
4
LrUp ⋅⋅⋅
−=∆ 2
8 µ LD
µρ DU ⋅⋅
=Re Ratio of inertial forces to viscous forces
2rUQ ⋅⋅= π
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2.76 Multi-scale System Design & Manufacturing
Micro-scale physics: FluidicsReynolds number
D = 50 µm U = 500 µm/s L = 1000 µm
ReAir and ReH2O << 1
Heavily damped
Limits response time (ms vs. µs)
LD
µρ DU ⋅⋅
=Re Ratio of inertial forces to viscous forces
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2.76 Multi-scale System Design & Manufacturing
Cross-scale couplingMacroMeso
Micro
Nano
FunctionFormFlowsPhysicsFabrication
GeometryMotion
InterfacesConstraints
Form
Etc…
MassMomentum
EnergyInformation
Flow
Etc…
ApplicationModelingLimiting
Dominant
Physics
Etc…
CompatibilityQualityRateCost
Fabrication
Etc…
WhatWhoWhy
Where
Function
Etc…
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2.76 Multi-scale System Design & Manufacturing
Strategies for jumping scales 1. Functional requirements
System
Subsystem
FR-DP relationships
GeometryMotion
InterfacesConstraints
Form
Etc…
MassMomentum
EnergyInformation
Flow
Etc…
ApplicationModelingLimiting
Dominant
Physics
Etc…
CompatibilityQualityRateCost
Fabrication
Etc…
WhatWhoWhy
Where
Function
Etc…
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2.76 Multi-scale System Design & Manufacturing
Strategies for jumping scales 2. Form & concept layout
DP/module layout
GeometryMotion
InterfacesConstraints
Form
Etc…
MassMomentum
EnergyInformation
Flow
Etc…
ApplicationModelingLimiting
Dominant
Physics
Etc…
CompatibilityQualityRateCost
Fabrication
Etc…
WhatWhoWhy
Where
Function
Etc…
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2.76 Multi-scale System Design & Manufacturing
Strategies for jumping scales 3. ALL Flow/physics lines
Intra and Inter
GeometryMotion
InterfacesConstraints
Form
Etc…
MassMomentum
EnergyInformation
Flow
Etc…
ApplicationModelingLimiting
Dominant
Physics
Etc…
CompatibilityQualityRateCost
Fabrication
Etc…
WhatWhoWhy
Where
Function
Etc…
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2.76 Multi-scale System Design & Manufacturing
Strategies for jumping scales 4. Flow physics
List macro assmpts.
Use ratios & OOM
Select those to model
GeometryMotion
InterfacesConstraints
Form
Etc…
MassMomentum
EnergyInformation
Flow
Etc…
ApplicationModelingLimiting
Dominant
Physics
Etc…
CompatibilityQualityRateCost
Fabrication
Etc…
WhatWhoWhy
Where
Function
Etc…
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2.76 Multi-scale System Design & Manufacturing
Strategies for jumping scales 5. System model
Sensitivity/gain check
Flow & fab compatibility
Un/de coupling
GeometryMotion
InterfacesConstraints
Form
Etc…
MassMomentum
EnergyInformation
Flow
Etc…
ApplicationModelingLimiting
Dominant
Physics
Etc…
CompatibilityQualityRateCost
Fabrication
Etc…
WhatWhoWhy
Where
Function
Etc…
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2.76 Multi-scale System Design & Manufacturing
Strategies for jumping scales 6. Parametric optimization
Excel works great
GeometryMotion
InterfacesConstraints
Form
Etc…
MassMomentum
EnergyInformation
Flow
Etc…
ApplicationModelingLimiting
Dominant
Physics
Etc…
CompatibilityQualityRateCost
Fabrication
Etc…
WhatWhoWhy
Where
Function
Etc…
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2.76 Multi-scale System Design & Manufacturing
Strategies for jumping scales 7. Concept selection
GeometryMotion
InterfacesConstraints
Form
Etc…
MassMomentum
EnergyInformation
Flow
Etc…
ApplicationModelingLimiting
Dominant
Physics
Etc…
CompatibilityQualityRateCost
Fabrication
Etc…
WhatWhoWhy
Where
Function
Etc…
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2.76 Multi-scale System Design & Manufacturing
Nano-scale system
components
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2.76 Multi-scale System Design & Manufacturing
Nano-scale for todayDriving tunneling current relationship
How this drives design
Gain and noise factors
Discussion
Group work
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2.76 Multi-scale System Design & Manufacturing
Gain factors to consider
Nano
Micro
Meso
Macro
NanoNano
NanoMicro
NanoMeso
NanoMacro
MicroNano
MicroMicro
MicroMeso
MicroMacro
MesoNano
MesoMicro
MesoMeso
MesoMacro
MacroNano
MacroMicro
MacroMeso
MacroMacro
Nano
Micro
Meso
Macro
I
I
I
I
SRfSRfSRfSRf
SRfSRfSRfSRf
SRfSRfSRfSRf
SRfSRfSRfSRf
O
O
O
O
⋅
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⎞⎜⎜⎝
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⎞⎜⎜⎝
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⎛
=
44434241
34333231
24232221
14131211
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2.76 Multi-scale System Design & Manufacturing
Nano-scaleMacro/meso/micro can be looked at with
common Newtonian physical descriptions
For Nm-scale Quantum Mechanics dominates
Approach to teaching Nano-scale (example)Tunneling (Qualitative/Quantitative)Nano-scale structures
TodayGoverning tunneling equationHow to apply to designMajor design issues
Reading
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2.76 Multi-scale System Design & Manufacturing
TunnelingElectrons have wave-like characteristics
Enables them to tunnel through space when ordinarily don’t have enough kinetic energy to get through
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2.76 Multi-scale System Design & Manufacturing
TunnelingElectrons have wave-like characteristics
Enables them to tunnel through space when ordinarily don’t have enough kinetic energy to get through
Ek
φ
0 a
Classical theory = particle to beExcluded from x > a
Particle thought
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2.76 Multi-scale System Design & Manufacturing
TunnelingElectrons have wave-like characteristics
Enables them to tunnel through space when ordinarily don’t have enough kinetic energy to get through
φ
0 a
Quantum theory = finite probabilitythat particle can exist at x > a
If so, is said to have tunneled
Wave thought
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2.76 Multi-scale System Design & Manufacturing
TunnelingElectrons have wave-like characteristics
Enables them to tunnel through space when ordinarily don’t have enough kinetic energy to get through
What should “?” depend upon?
[ ]gapeI ⋅−∝ ?Solution to Schrodinger’s equation
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2.76 Multi-scale System Design & Manufacturing
TunnelingElectrons have wave-like characteristics
Enables them to tunnel through space when ordinarily don’t have enough kinetic energy to get through
[ ]gapkeI ⋅⋅−∝ 2 m = Electron mass= 9.11 x 10-31 kg
Local potential barrier heightanalogous to work (~ 5 ev)1 eV = 1.6 x10-19 J
h = Planks constant / 2 π= 1.05 x10-34 J-s
hm
kφ⋅⋅
=2
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2.76 Multi-scale System Design & Manufacturing
Fundamental issue for semesterSensitivity
Assuming a barrier width of 5 Angstroms
Barrier height of 4 eV
Exponential is on the order of 10-5
Current is on the order of nAmps
[ ]gapkeI ⋅⋅−∝ 2hm
kφ⋅⋅
=2
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2.76 Multi-scale System Design & Manufacturing
AssignmentForm your STM groups
List of CS and FRs for the STM
List of 5 F’s you have to model
FR-DP mapping and de/un coupling plans
Schedule meeting with Culpepper next FridayDiscuss theoryDesign approachFR-DP MatchingGain matrices
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2.76 Multi-scale System Design & Manufacturing
Fundamental issue for semesterWhat is the sensitivity of current to gap over
the range of gap you will have to design for?
Gap of few angstroms to 10 angstroms
[ ]gapkeI ⋅⋅−∝ 2hm
kφ⋅⋅
=2