Introduction to Nanomechanics (Spring 2012) Martino Poggio
Slide 2
Introduction to Nanomechanics228.03.2012 L = 120 m w = 3 m t =
100 nm E Si = 169 GPa k = 73 m x rms = 9 for T = 4.2 K
Slide 3
Introduction to Nanomechanics3 120 m k = 60 N/mf = 3 kHzQ =
50,000 at 4K 100 nm thick shaft 1 m thick mass loading Fabricated
by B. Chui - IBM Ultrasensitive Cantilevers 28.03.2012
Slide 4
Introduction to Nanomechanics4 350037504000 Frequency (Hz) 4250
1000 100 10 1 0.1 0.01 1E-3 1E-4 1E-5 Sprectral density ( 2 /Hz)
28.03.2012
Slide 5
Real-time detection of nuclear spin polarization 1 0 2 -2 1 0 2
-2 0102030 time (s) 405060 Natural spin fluctuations Thermal
cantilever noise s X = 0.300.08 2 2 s Y = 0.0560.008 2 2 m = 3.5 s
Cantilever amplitude (Angstrom) Experiment with N ~ 10 6 spins ( 19
F in Calcium fluoride) Introduction to
Nanomechanics528.03.2012
Slide 6
25552560 Frequency (Hz) 255025652570 Spectral density ( 2 /Hz)
1 0.1 100 10 1000 0.01 Cantilever thermal noise Statistically
polarized spin signal from 19 F nuclei in calcium fluoride Power
Spectral Density of Nuclear Spin Polarization Introduction to
Nanomechanics628.03.2012
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Introduction to Nanomechanics728.03.2012
Slide 8
Introduction to Nanomechanics828.03.2012
Slide 9
Introduction to Nanomechanics9 What causes dissipation?
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Introduction to Nanomechanics10 What causes dissipation?
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Slide 11
How to measure dissipation? Ring-down Drive Frequency Sweep
Measuring thermal noise spectrum Introduction to
Nanomechanics1128.03.2012
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Introduction to Nanomechanics1228.03.2012
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Introduction to Nanomechanics1328.03.2012
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Introduction to Nanomechanics1428.03.2012
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Introduction to Nanomechanics1528.03.2012
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Introduction to Nanomechanics1628.03.2012
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Introduction to Nanomechanics1728.03.2012
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Introduction to Nanomechanics1828.03.2012
Slide 19
Introduction to Nanomechanics19 Improving cantilever
dissipation 28.03.2012
