Gratings in indium oxide film overlayers on ion-exchanged waveguides by excimer laser micromachining

Pissadakis, S.; Reekie, L.; Zervas, M. N.; Wilkinson, J. S.; Kiriakidis, G.
February 2001
Applied Physics Letters;2/5/2001, Vol. 78 Issue 6, p694
Academic Journal
Relief Bragg gratings were imprinted by 248 nm interferometric excimer laser ablation on potassium ion-exchanged channel waveguides in BK-7 glass overlaid with a thin high-index InO[sub x] film. Using five pulses of energy density 60 mJ/cm[sup 2], a spectral transmittance notch of depth 66% and Δλ[sub FWHM]<0.1 nm was obtained at 1547 nm in the TE polarization for a waveguide having a nominal width of 8 μm and a 135-nm-thick InO[sub x] overlayer. In waveguides coated with 100 nm InO[sub x], with widths increasing from 3 to 8 μm, the reflection wavelength shifted by 0.12 nm/μm and the reflectivity increased monotonically. © 2001 American Institute of Physics.


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