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

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

  2. 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

  3. Typical NSOM Setup

  4. WITEC NSOM Setup http://www.witec.de/snom.html

  5. NSOM Probe Techniques Aperture Apertureless STOM

  6. NSOM Aperture Probes Chemical Etching Fiber-Pulling Evanescent Decay Aluminum Deposition 300 nm 300 nm

  7. WITEC Microfabricated NSOM Probes wafer with 228 tips Si cantilever hollow Al pyramid tip ~ 100 nm http://www.witec.de/snom.html

  8. 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…

  9. NSOM Fluorescence Imaging of Single Dye Molecules 0˚ 2.1˚ 13.5˚

  10. NSOM Spectroscopy of Quantum Dots

  11. 1 µm NSOM of 2D Photonic Crystals 100 nm

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