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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 22, Iss. 2 — Feb. 1, 2004
  • pp: 612–

Multilayer Thin-Film Stacks With Steplike Spatial Beam Shifting

Martina Gerken and David A. B. Miller

Journal of Lightwave Technology, Vol. 22, Issue 2, pp. 612- (2004)


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Abstract

This paper demonstrates the use of a single multilayer thin-film stack for generating custom-engineered spatial dispersion, i.e., spatial shift as a function of wavelength. Based on group-velocity effects similar to the superprism effect observed in photonic crystals, this thin-film grating (TFG) device allows for multiplexing or demultiplexing multiple wavelength-division-multiplexed (WDM) channels using a single nonperiodic thin-film stack. We designed a four-channel TFG for coarse WDM applications with 20-nm channel spacing and flat-top passbands. This paper shows that flat-top passbands correspond to a steplike spatial beam shifting with wavelength. The influence of a finite beamwidth on the passband shape is discussed using Fourier decomposition of the beam into plane-wave components. The paper concludes with experimental results for a three-channel TFG demonstrating steplike beam shifting.

© 2004 IEEE

Citation
Martina Gerken and David A. B. Miller, "Multilayer Thin-Film Stacks With Steplike Spatial Beam Shifting," J. Lightwave Technol. 22, 612- (2004)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-22-2-612


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