WIREBONDED MICROCOILS FOR MICROSCALE MAGNETIC … · WIREBONDED MICROCOILS FOR MICROSCALE MAGNETIC...
Transcript of WIREBONDED MICROCOILS FOR MICROSCALE MAGNETIC … · WIREBONDED MICROCOILS FOR MICROSCALE MAGNETIC...
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WIREBONDED MICROCOILS FOR MICROSCALE MAGNETIC RESONANCE-BASED DETECTION
Vlad Badilita, J.G. Korvink, and U. Wallrabe
1Dept. of Microsystems Engineering – IMTEK, University of Freiburg, Germany
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Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 2 -
MR imaging and spectroscopy M
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body organs chemical samples
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Microscale MR samples
10 m
single cell
(1 mm)3 (10 µm)3 10-6
signal reduction
• high-strength static magnetic fields • small highly sensitive RF receiver coils • superconducting receiver coils
cccccc ffffiiiieeeelllldddddssssccccccccccccccceeeeeeeeeeeeeeeeeeeeeiiiivvvveeeerrrrrr ccccccccccccccccccccooooooooooooooooooooooooooiiiiiiiiiiiiillllllllllllllllllssssssssssssssssss ooooiiiiiiiiiiiiiillllssss
solenoidal wirebonded microcoils
Signal recovery
500µm
JMM, 015021 (2010)
Sens. Act. 156, p. 328 (2009)
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How MR works?
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1H nucleus in external magnetic field
atomic nucleus (1H)
angular momentum
B0
external magnetic field
- ½γB0ħ
+ ½γB0ħ
γB0ħ
Larmor frequency:
ωL = γB0
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Boltzmann factor
Boltzmann factor B0 T = 300K
exp −
γB0kBT
⎛
⎝ ⎜
⎞
⎠ ⎟
magnetic energy
thermal energy
+ ½γB0ħ
- ½γB0ħ
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Boltzmann factor B0 T = 300K
exp −
γB0kBT
⎛
⎝ ⎜
⎞
⎠ ⎟
magnetic energy
thermal energy
Manipulate Boltzmann factor – temperature
+ ½γB0ħ
- ½γB0ħ
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Boltzmann factor B0 T = 225K
exp −
γB0kBT
⎛
⎝ ⎜
⎞
⎠ ⎟
magnetic energy
thermal energy
Manipulate Boltzmann factor – temperature
- ½γB0ħ
+ ½γB0ħ
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Boltzmann factor B0 T = 150K
exp −
γB0kBT
⎛
⎝ ⎜
⎞
⎠ ⎟
magnetic energy
thermal energy
Manipulate Boltzmann factor – temperature
+ ½γB0ħ
- ½γB0ħ
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Boltzmann factor B0 T = 0K
exp −
γB0kBT
⎛
⎝ ⎜
⎞
⎠ ⎟
magnetic energy
thermal energy
Manipulate Boltzmann factor – temperature
- ½γB0ħ
+ ½γB0ħ
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B0 = 2.35 T (100 MHz) T = 300K
Manipulate Boltzmann factor – B0 field
- ½γB0ħ
+ ½γB0ħ
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B0 = 4.7 T (200 MHz) T = 300K
Manipulate Boltzmann factor – B0 field
- ½γB0ħ
+ ½γB0ħ
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B0 = 9.4 T (400 MHz) T = 300K
Manipulate Boltzmann factor – B0 field
- ½γB0ħ
+ ½γB0ħ
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The overall signal
B0 = 2.35 T (100 MHz) T = 300K
1025
1020
- ½γB0ħ
+ ½γB0ħ
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The MR experiment
B0
x
y
z
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B0
x
y
z Larmor frequency:
ωL = γB0
ωL
Free Induction Decay F I D
The MR experiment
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ωL
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B0
x
y
z Larmor frequency:
wL = gB0
The MR experiment
Spectrum
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How MR imaging works?
1D hollow sample with 1 disk of water and 1 disk of water + foam in a constant 1T magnetic field
resonance curve in a 1T field
ALL water molecules undergo a resonance at 42.57 MHz
NOT EXCITING …
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the same sample in a non-uniform magnetic field
resonance curve in a 1T field
2 resonance peaks with 2 different amplitudes
VERY EXCITING!!
How MR imaging works?
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General structure of an MRI scanner
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Development of wirebonded microcoils
as MR detectors
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Hand-wound µ-coil
Vlad Badilita - DIASPORA 2012 - 22 - Sept. 26th, 2012
Olson et al., Science, vol. 270, p.1967, 1995.
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Still needed?
Vlad Badilita - DIASPORA 2012 - 23 -
Meaningful process for:
Circular solenoids
Scalable in size
Parallel processing or instead very fast
Useful for many purposes
Coils through wire bonding
Sept. 26th, 2012
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Wirebonding technology
Vlad Badilita - DIASPORA 2012 - 24 - Sept. 26th, 2012
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Wirebonding technology
Vlad Badilita - DIASPORA 2012 - 25 -
Pads: Cr/Au (50/500 nm)
Coil: Wire Bonder with insulated gold wire 25 µm diameter
Posts: Lithography of SU-8 or PMMA – 600 µm height
Substrate: silicon or glass
Sept. 26th, 2012
JMM, vol. 20, 015021, 2010
Sensors & Actuators A, vol. 156, p.328, 2009
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Wirebonding of solenoidal microcoils
JMM, 015021 (2010)
Sens. Act. 156, p. 328 (2009)
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Gallery
Vlad Badilita - DIASPORA 2012 - 27 - Sept. 26th, 2012
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Gallery
Vlad Badilita - DIASPORA 2012 - 28 - Sept. 26th, 2012
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Magnetic resonance imaging (MRI)
for microscopic samples
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Experimental – MRI @ 9.4 T
9.4T MRI scanner – 1H Larmor frequency = 400 MHz
coil connected with PCB tuning and matching circuit @ 400 MHz / 50 Ω
signal transmitted via wires tethered at the terminals of the circuit
2012 Vlad Badilita - DIASPORA 2000000000000000000000000000000000000122222222222222222222222222222222222
V. Badilita et al.
Lab Chip, p. 1387 (2010)
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Imaging of algal cells
2012 Vlad Badilita - DIASPORA 2000000000000000000000000000000000000122222222222222222222222222222222222
MEMS 2011, p. 809
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Magnetic resonance spectroscopy
for microscopic samples
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Magic Angle Spinning NMR spectroscopy
B0
θm=54.74°
Magic Angle Spinning configuration
nuclear spin interactions (dipolar, chemical shift anisotropy, quadrupolar) lead to broad and featureless lines
nuclear spin interactions are time
dependent and can be averaged by magic angle spinning
high resolution spectra
high sensitivity
cos2 θm = 1/3
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Why inductive coupling for NMR?
pick-up µ-coil
NMR spectrometer coil
sample
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Wirebonded microcoil for wireless NMR
transparent SU-8 sample holder
insulated Au wire 25μm diameter
electroplated Au pads + interdigitated capacitor
transparent Pyrex substrate
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Inductive coupling – high sensitivity
mixture D2O:H2O 99.9 : 0.1% signal from 300 pl H2O ≈ 1015 protons
vertical bore 11.7 T spectrometer 1H Larmor frequency = 500 MHz
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Inductive coupling – coil spinning
the coil mechanically withstands the high spinning speed
the coil withstands the induced eddy currents
V. Badilita et al.
PLoS ONE, e42848 (2012)
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Inductive coupling – coil spinning
SS tt 26t26thh 20120122
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Planar phased arrays of microcoils
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Wirebond wound multilayer process
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Pyrex wafer Electroplated bond pads
Cross-section: Top view:
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Wirebond wound multilayer process
Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 41 -
SU-8 pillars
SU-8 frame
Pyrex wafer Electroplated bond pads
Cross-section: Top view:
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Wirebond wound multilayer process
Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 42 -
Wirebonded coil gold wire Ø 25 μm,
three turns
SU-8 pillars
SU-8 frame
Pyrex wafer Electroplated bond pads
Cross-section: Top view:
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Wirebond wound multilayer process
Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 43 -
Wirebonded coil second level
SU-8 pillars
SU-8 frame
Pyrex wafer
Cross-section: Top view: Electroplated bond pads
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Wirebond wound multilayer process
Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 44 -
Wirebonded coil third level
SU-8 pillars
SU-8 frame
Pyrex wafer
Cross-section: Top view: Electroplated bond pads
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Wirebond wound multilayer process
Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 45 -
SU-8 planarization
Wirebonded coils on three levels
SU-8 pillars
SU-8 frame
Pyrex wafer
Cross-section: Top view: Electroplated bond pads
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Wirebond phased array of microcoils
Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 46 -
Bondpad
Pyrex substrate
Coil
SU-8
2 mm
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Results - Imaging
Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 47 -
Sample container:
Fish eggs
FOV 0.55 cm
In-plane resolution of 30 x 30 µm2
Contrast to noise ratio 10 Measurement time 13 min 49 s
Nucleus
1 mm
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Conclusions – WB µ-coils for µ-APPs
Vlad Badilita - DIASPORA 2012 - 48 - Sept. 26th, 2012
µ-coils for µ-MRI
FOV 0.55 cm FOV 0.55 cm
phased arrays µ-coils for MACS µ-coils for MACS
V. Badilita et al.
Soft Matter, REVIEW, DOI: 10.1039/c2sm26065d (2012)
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Sept. 26th, 2012 Vlad Badilita - DIASPORA 2012 - 49 -
Thank you!