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Time-domain wave-oriented data processing of scattering by nonuniform truncated gratings

Publication ,  Journal Article
Kralj, D; McClure, M; Carin, L; Felsen, LB
Published in: Journal of the Optical Society of America A: Optics and Image Science, and Vision
January 1, 1994

In a companion paper [J. Opt. Soc. Am. A 11, 2675 (1994)] we investigated wave-oriented processing techniques that extract from frequency-domain (FD) scattering data for nonuniform truncated thin-wire or strip gratings the wave phenomenology that ties features in data to scattering mechanisms that are responsible for these features. The resulting observable-based parameterization (OBP) should be useful for construction of wave-based algorithms aimed, through forward and backward propagation routines, at design, classification, and imaging. The processing strategy projects the data, which are assembled on an elevated track at height z parallel to the grating-plane coordinate x, onto the (t, w) phase-space subdomain by means of windowed Fourier transforms; here kx is the spatial spectral wave number corresponding to x. The (t, w) phase-space distributions and their information content for various grating configurations are analyzed in detail and are related to previously derived analytic scattering models based on truncated local Floquet modes (FM’s) and on FM-modulated edge diffractions. We explore time-domain (TD) wave- oriented processing techniques for scattering by truncated gratings produced by a pulsed incident plane wave. By spatial-temporal resolution, the TD data base adds to the FD processing options. Time (£)-frequency (co) phase-space distributions implemented through windowed transforms extract from TD data new TD phenomenology, TD-OBP, that differs fundamentally from that in the frequency domain: Strongly dispersive TD-FM’s with prolonged time-varying frequency response (t, w) where m is the FM index, and temporally well-resolved weakly dispersive impulselike edge diffractions. These phénoménologies extracted from the TD scattering data are interpreted in terms of, and shown to be in agreement with, previously de-veloped analytic TD scattering models. The (t, w) processing is applied to pulsed plane-wave scattering data produced for various grating configurations by previously calibrated numerical reference codes and reveals the changes in (t, w) footprints that are attributable to departures from strict canonical truncated periodicity. Short-pulse TD excitation is found to resolve the element structure within each scattering cell directly, in contrast to (t, w) processing, in which element-structure information is tied indirectly to the FM excitation strengths. © 1994 Optical Society of America.

Duke Scholars

Published In

Journal of the Optical Society of America A: Optics and Image Science, and Vision

DOI

EISSN

1520-8532

ISSN

1084-7529

Publication Date

January 1, 1994

Volume

11

Issue

10

Start / End Page

2685 / 2694

Related Subject Headings

  • Optics
  • 4009 Electronics, sensors and digital hardware
  • 4006 Communications engineering
  • 1113 Opthalmology and Optometry
  • 0906 Electrical and Electronic Engineering
  • 0205 Optical Physics
 

Citation

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Kralj, D., McClure, M., Carin, L., & Felsen, L. B. (1994). Time-domain wave-oriented data processing of scattering by nonuniform truncated gratings. Journal of the Optical Society of America A: Optics and Image Science, and Vision, 11(10), 2685–2694. https://doi.org/10.1364/JOSAA.11.002685
Kralj, D., M. McClure, L. Carin, and L. B. Felsen. “Time-domain wave-oriented data processing of scattering by nonuniform truncated gratings.” Journal of the Optical Society of America A: Optics and Image Science, and Vision 11, no. 10 (January 1, 1994): 2685–94. https://doi.org/10.1364/JOSAA.11.002685.
Kralj D, McClure M, Carin L, Felsen LB. Time-domain wave-oriented data processing of scattering by nonuniform truncated gratings. Journal of the Optical Society of America A: Optics and Image Science, and Vision. 1994 Jan 1;11(10):2685–94.
Kralj, D., et al. “Time-domain wave-oriented data processing of scattering by nonuniform truncated gratings.” Journal of the Optical Society of America A: Optics and Image Science, and Vision, vol. 11, no. 10, Jan. 1994, pp. 2685–94. Scopus, doi:10.1364/JOSAA.11.002685.
Kralj D, McClure M, Carin L, Felsen LB. Time-domain wave-oriented data processing of scattering by nonuniform truncated gratings. Journal of the Optical Society of America A: Optics and Image Science, and Vision. 1994 Jan 1;11(10):2685–2694.
Journal cover image

Published In

Journal of the Optical Society of America A: Optics and Image Science, and Vision

DOI

EISSN

1520-8532

ISSN

1084-7529

Publication Date

January 1, 1994

Volume

11

Issue

10

Start / End Page

2685 / 2694

Related Subject Headings

  • Optics
  • 4009 Electronics, sensors and digital hardware
  • 4006 Communications engineering
  • 1113 Opthalmology and Optometry
  • 0906 Electrical and Electronic Engineering
  • 0205 Optical Physics