Near Field Scanning Optical Microscopy
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Near Field Scanning Optical Microscopy (NSOM, SNOM, NFOM) Stephanie Pruzinsky Group Meeting, June 6, 2002 PowerPoint PPT Presentation


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Near Field Scanning Optical Microscopy (NSOM, SNOM, NFOM) Stephanie Pruzinsky Group Meeting, June 6, 2002. 0.61  n sin 0. d =. Near-Field v. Far-Field . Near-Field (Evanescent). Light with spatial frequencies are present in the tip but decay within one wavelength

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Near Field Scanning Optical Microscopy (NSOM, SNOM, NFOM) Stephanie Pruzinsky Group Meeting, June 6, 2002

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Near Field Scanning Optical Microscopy

(NSOM, SNOM, NFOM)

Stephanie Pruzinsky

Group Meeting, June 6, 2002


0.61 

n sin 0

d =

Near-Field v. Far-Field

Near-Field (Evanescent)

Light with spatial frequencies are present in the tip but decay within one wavelength

dmin ~ 1 – 20 nm has been reported

dmin ~ 50 – 100nm is more common

Far-Field (Diffraction Limited)

dmin ~ /2 - 

http://www.nrel.gov/sss/nsom.html


Typical NSOM Setup


WITEC NSOM Setup

http://www.witec.de/snom.html


NSOM Probe Techniques

Aperture

Apertureless

STOM


NSOM Aperture Probes

Chemical Etching

Fiber-Pulling

Evanescent Decay

Aluminum Deposition

300 nm

300 nm


WITEC Microfabricated NSOM Probes

wafer with 228 tips

Si cantilever

hollow Al pyramid

tip ~ 100 nm

http://www.witec.de/snom.html


NSOM Applications

  • Fluorescence imaging

    • tagged in situ biological samples

    • phase-separated or patterned films and monolayers

    • single dye molecules

  • Microspectroscopy

    • quantum dots

    • nanoparticles

    • plasmonic crystals

    • photonic crystals

  • Laser ablation

    • localized MALDI mass spectrometry

  • Photolithography, localized photochemistry…


NSOM Fluorescence Imaging of Single Dye Molecules

2.1˚

13.5˚


NSOM Spectroscopy of Quantum Dots


1 µm

NSOM of 2D Photonic Crystals

100 nm


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