Heating mechanisms in a near-field optical system

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

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

A finite-difference-time-domain and two finite-difference-thermal models are used to study various heating mechanisms in a near-field optical system. It is shown that the dominant mechanism of sample heating occurs from optical power that is transferred from the probe to a metallic thin-film sample. The optical power is absorbed in the sample and converted to heat. The effects of thermal radiation from the probe's coating and thermal conduction between the probe and the sample are found to be negligible. In a two-dimensional waveguide with TE polarization, most of the optical power is transferred directly from the aperture to the sample. In a two-dimensional waveguide with TM polarization, there is significant optical power transfer between the probe's aluminum coating and the sample. The power transfer results in a wider thermal distribution with TM polarization than with TE polarization. Using computed temperature distributions in a Co-Pt film, we predict the relative size of thermally written marks in a three-dimensional geometry. The predicted mark size shows a 30% asymmetry that is due to polarization effects.

Original languageEnglish (US)
Pages (from-to)5951-5958
Number of pages8
JournalApplied Optics
Volume36
Issue number24
StatePublished - Aug 20 1997

Fingerprint

Optical systems
near fields
Polarization
Heating
heating
polarization
probes
Waveguides
Aluminum coatings
Metallic films
waveguides
aluminum coatings
Heat radiation
thermal radiation
Temperature distribution
temperature distribution
Thin films
apertures
Coatings
asymmetry

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Kann, J. L., Milster, T. D., Froehlich, F. F., Ziolkowski, R. W., & Judkins, J. B. (1997). Heating mechanisms in a near-field optical system. Applied Optics, 36(24), 5951-5958.

Heating mechanisms in a near-field optical system. / Kann, Joshua L.; Milster, Thomas D; Froehlich, Fred F.; Ziolkowski, Richard W; Judkins, Justin B.

In: Applied Optics, Vol. 36, No. 24, 20.08.1997, p. 5951-5958.

Research output: Contribution to journalArticle

Kann, JL, Milster, TD, Froehlich, FF, Ziolkowski, RW & Judkins, JB 1997, 'Heating mechanisms in a near-field optical system', Applied Optics, vol. 36, no. 24, pp. 5951-5958.
Kann JL, Milster TD, Froehlich FF, Ziolkowski RW, Judkins JB. Heating mechanisms in a near-field optical system. Applied Optics. 1997 Aug 20;36(24):5951-5958.
Kann, Joshua L. ; Milster, Thomas D ; Froehlich, Fred F. ; Ziolkowski, Richard W ; Judkins, Justin B. / Heating mechanisms in a near-field optical system. In: Applied Optics. 1997 ; Vol. 36, No. 24. pp. 5951-5958.
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