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Applied Optics

Applied Optics


  • Vol. 12, Iss. 5 — May. 1, 1973
  • pp: 1015–1025

Characteristics of Optical Guided Modes in Lossy Waveguides

A. Reisinger  »View Author Affiliations

Applied Optics, Vol. 12, Issue 5, pp. 1015-1025 (1973)

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A number of analysis techniques aimed at determining the characteristics of optical guided waves propagating in lossy structures are examined. The exact theory is used as a guide to assess the validity of several approximate methods based on two basic approaches: (a) geometrical optics and (b) perturbation calculations. The limitations of the conventional perturbation techniques are specified. We present a generalized procedure that permits an accurate description of metal boundaries at optical frequencies. In this case, TM modes differ from their TE counterparts by a field buildup near conducting walls and by the existence of an additional surface plasma mode. The dependence of attenuation coefficients on film thickness and mode order are discussed. The use of low-index dielectric buffers to reduce ohmic losses is considered. It is found that, with increasing buffer thickness, TMN modes undergo a continuous transformation to become TMN+1.

© 1973 Optical Society of America

Original Manuscript: August 2, 1972
Published: May 1, 1973

A. Reisinger, "Characteristics of Optical Guided Modes in Lossy Waveguides," Appl. Opt. 12, 1015-1025 (1973)

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  18. A MWVE calculation was recently performed by Chang and Loh (Ref. 24) in the case of Al electrodes @10.6 μ. At that wavelength the coefficient Δ ≃ 1.3, indicating that their results should be in excess by a factor of Δ + 1 ≃ 2.3. (The actual figure depends, on the thickness of the waveguide, and we found it to be always <2.4.)
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  23. The author is indebted to Eli Burstein for pointing out that the attenuation of this mode decreases rapidly in the ir.
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  27. The author is indebted to an anonymous reviewer for suggesting this simple procedure.

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