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Frequency selective Bragg filters based on (Mg,Zn) (S,Se) waveguides for the visible spectral range

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5 Author(s)
Eisert, D. ; Tech. Phys., Wurzburg Univ., Germany ; Bacher, G. ; Forchel, A. ; Leonardi, K.
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Bragg grating transmission filters were fabricated on ZnMgSSe-ZnSSe-ZnMgSSe planar optical waveguide structures using a high resolution electron-beam lithographic process. Varying the grating geometry, the filter characteristics like resonance wavelength, modulation contrast, and stopband width can be adjusted. For example, for a L=600-μm-long grating with a period of /spl Lambda/=120 nm, we achieve 16% residual transmission and a spectral width of 4 /spl Aring/ for the designed resonance wavelength of 603 mm. The experimental data can be explained quantitatively with a transfer matrix calculation assuming a coupling coefficient of 40 cm/sup -1/.

Published in:

Photonics Technology Letters, IEEE  (Volume:10 ,  Issue: 8 )