introduction to nanomechanics spring 2012 n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Introduction to Nanomechanics (Spring 2012) PowerPoint Presentation
Download Presentation
Introduction to Nanomechanics (Spring 2012)

Loading in 2 Seconds...

play fullscreen
1 / 20

Introduction to Nanomechanics (Spring 2012) - PowerPoint PPT Presentation


  • 123 Views
  • Uploaded on

Introduction to Nanomechanics (Spring 2012). Martino Poggio. Nanomechanical Measurements. Displacement measurement is crucial for force transduction Different types of nanomechanical displacement measurements (advantages & disadvantages) Focus on optical interferometry

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Introduction to Nanomechanics (Spring 2012)' - claire-crawford


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
nanomechanical measurements
Nanomechanical Measurements
  • Displacement measurement is crucial for force transduction
  • Different types of nanomechanical displacement measurements (advantages & disadvantages)
  • Focus on optical interferometry
  • Signal-to-noise ratio

Introduction to Nanomechanics

transduction vs sensing
Transduction vs. Sensing
  • A transducer receives energy from one system and transmits it to another, often in a different form.
  • A sensor responds to physical stimuli (e.g. heat, light, pressure, or motion) and generates an electronic signal for detection.

Introduction to Nanomechanics

mechanical force transducers
Mechanical Force Transducers

F

  • Now we require a sensor for mechanical motion.

x

Introduction to Nanomechanics

sensors for mechanical motion
Sensors for Mechanical Motion
  • Tunneling
  • Optical Deflection
  • Optical Interferometry
  • Microwave Interferometry
  • Magnetomotive
  • Piezoelectric
  • Capacitive

Introduction to Nanomechanics

displacement measurements
Displacement Measurements

STM Detection

Introduction to Nanomechanics

displacement measurements1
Displacement Measurements

Laser deflection

Introduction to Nanomechanics

displacement measurements2
Displacement Measurements

Laser interferometry

Fixed mirror

“spring”

x

Pin

“Movable” mirror

Introduction to Nanomechanics

displacement measurements3
Displacement Measurements

Laser interferometry

Introduction to Nanomechanics

displacement measurements4
Displacement Measurements

Laser interferometry

LIGO – Gravitational Wave Detection

Introduction to Nanomechanics

displacement measurements5
Displacement Measurements

Laser interferometry

Introduction to Nanomechanics

displacement measurements6
Displacement Measurements

Microwave interferometry – capacitive detection

K. L. Lehnert, JILA

Introduction to Nanomechanics

displacement measurements7
Displacement Measurements

K. L. Lehnert, JILA

Introduction to Nanomechanics

displacement measurements8
Displacement Measurements

Magnetomotive detection (via Faraday’s Law)

Figure from K.L. Ekinci, Boston U.

A. Cleland & M. Roukes, 1999.

Introduction to Nanomechanics

displacement measurements9
Displacement Measurements

Capacitive detection

Introduction to Nanomechanics

displacement measurements10
Displacement Measurements

Capacitive detection

Introduction to Nanomechanics

displacement measurements11
Displacement Measurements

Piezoelectric detection

Introduction to Nanomechanics

displacement measurements12
Displacement Measurements

Capacitive detection

Introduction to Nanomechanics

slide19

e-

2DEG

L

QPC

R

2DEG

QPC as a mechanical displacement detector

Introduction to Nanomechanics

displacement measurements13

10-12m / (Hz)1/2

100

10-21

10-1

10-22

10-2

10-23

10-3

10-24

10-4

10-25

10-5

4.50

4.75

5.00

5.25

Frequency (kHz)

Displacement Measurements

Measurement of Cantilever Thermal Noise at 4.2 K

Spectral Density (A2 / Hz)

Spectral Density (Å2 / Hz)

Introduction to Nanomechanics