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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 4 — Feb. 20, 2006
  • pp: 1643–1657

Near-field characterization of propagating optical modes in photonic crystal waveguides

Maxim Abashin, Pierpasquale Tortora, Iwan Märki, Uriel Levy, Wataru Nakagawa, Luciana Vaccaro, Hans Peter Herzig, and Yeshaiahu Fainman  »View Author Affiliations

Optics Express, Vol. 14, Issue 4, pp. 1643-1657 (2006)

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We analyze the propagating optical modes in a Silicon membrane photonic crystal waveguide, based on subwavelength-resolution amplitude and phase measurements of the optical fields using a heterodyne near-field scanning optical microscope (H-NSOM). Fourier analysis of the experimentally obtained optical amplitude and phase data permits identification of the propagating waveguide modes, including the direction of propagation (in contrast to intensity-only measurement techniques). This analysis reveals the presence of two superposed propagating modes in the waveguide. The characteristics of each mode are determined and found to be consistent with theoretical predictions within the limits of fabrication tolerances. An analysis of the relative amplitudes of these two modes as a function of wavelength show periodic oscillation with a period of approximately 3.3 nm. The coupling efficiency between the ridge waveguide and the photonic crystal waveguide is also estimated and found to be consistent with the internal propagating mode characteristics. The combination of high-sensitivity amplitude and phase measurements, subwavelength spatial resolution, and appropriate interpretive techniques permits the in-situ observation of the optical properties of the device with an unprecedented level of detail, and facilitates the characterization and optimization of nanostructure-based photonic devices and systems.

© 2006 Optical Society of America

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(230.7370) Optical devices : Waveguides

ToC Category:
Photonic Crystals

Original Manuscript: January 9, 2006
Revised Manuscript: February 3, 2006
Manuscript Accepted: February 3, 2006
Published: February 20, 2006

Maxim Abashin, Pierpasquale Tortora, Iwan Märki, Uriel Levy, Wataru Nakagawa, Luciana Vaccaro, Hans Herzig, and Yeshaiahu Fainman, "Near-field characterization of propagating optical modes in photonic crystal waveguides," Opt. Express 14, 1643-1657 (2006)

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