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Lasers and waveguide arrays

By Ksenia Dolgaleva | Posted: 19 May 2010

Yesterday and today I’ve been attending very interesting sections on novel phenomena. There have been a lot of works done in waveguide arrays lately, especially in 2D arrays, produced by femtosecond laser writing. I would like to especially mention the talk on 2D Dynamic Localization of Light, given by Dr. Alexander Szameit on Monday (QMA7). In that presentation, he told us about the observation of approximate dynamic localization in a 2D waveguide array, in which there were two layers of periodic structures, staggered with respect to each other. Optical analog of Bloch oscillations and dynamic localizations can be observed in coupled waveguide arrays under the condition of a gradient in the effective index from waveguide to waveguide, produced by the change of the waveguide width or by curving the waveguide array. You can excite one waveguide, and the light, instead of spreading all over the array because of diffraction, would relocalize in that initially excited waveguide periodically. This phenomenon has both fundamental and practical implications. E. g., one can make a narrow-band filter by properly design the waveguide array to exhibit the relocalization for a certain wavelength, so that at the output of the structure all the light would exit through the initially excited waveguide. … (May 18, 2010) Click here to read the complete post.

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