Convenient near-field optical measurement and analysis of polystyrene spheres

S.-H. Chen, H.C. Hsiung, W.-B. Su, Din-ping Tsai

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)


The modification of a commercial tapping mode atomic force microscope (AFM) into a transmission mode near-field scanning optical microscope (NSOM) is presented and polystyrene spheres in the diameter of 100 nm are used in this experiment. The detection of near-field signals is based on photodiodes with lock-in technique, and resolutions of topography and near-field signals obtained are about 10 and 20 nm, respectively. Furthermore, it is discovered that the computer-simulated near-field energy distribution profile, obtained by scanning over polystyrene spheres under illumination mode, falls within 5% range as compared with experimental values. The near-field absorption coefficient can be determined by this way. This will be a useful theoretical model to analyze the near-field transmission effect from others. © 2006 Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)129-132
Number of pages4
Issue number1
Publication statusPublished - 16 Sept 2006
Externally publishedYes


  • Atomic force microscope (AFM)
  • Near-field absorption coefficient
  • Near-field scanning optical microscope (NSOM)
  • Polystyrene spheres

ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Surfaces, Coatings and Films


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