Near-field optical detection of asperities in dielectric surfaces

Joshua L. Kann, Thomas D Milster, Fred F. Froehlich, Richard W Ziolkowski, Justin B. Judkins

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

This paper presents a theoretical investigation of the behavior of the electromagnetic-field in the near and far zone during scanning of dielectric materials using a near-field optical aperture. It is seen that the dimension of the air gap between the sample and the probe dictates the quantum of energy coupled from the NFO probe onto the flat dielectric sample. For the case of TE polarization, a monotonic falloff of coupled energy with air gap is observed, while for TM polarization with materials having a higher index, nonzero values of the aperture-to-dielectric spacing yields the maximum energy coupling. Surface irregularities of height in the dielectric material result in modulations in the phase and magnitude of the transmitted of the electric field, for near zone. While the far zone can be detected by either total or differential detection, it is observed that for both TM and TE polarization, acceptable images are obtained by differential detection.

Original languageEnglish (US)
Pages (from-to)501-502
Number of pages2
JournalJournal of the Optical Society of America A: Optics and Image Science, and Vision
Volume12
Issue number3
StatePublished - Mar 1995

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Air
Electromagnetic Fields
Polarization
Electromagnetic fields
Electric fields
Modulation
Scanning

ASJC Scopus subject areas

  • Engineering(all)

Cite this

Near-field optical detection of asperities in dielectric surfaces. / Kann, Joshua L.; Milster, Thomas D; Froehlich, Fred F.; Ziolkowski, Richard W; Judkins, Justin B.

In: Journal of the Optical Society of America A: Optics and Image Science, and Vision, Vol. 12, No. 3, 03.1995, p. 501-502.

Research output: Contribution to journalArticle

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