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Optics Letters

Optics Letters

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  • Vol. 27, Iss. 5 — Mar. 1, 2002
  • pp: 327–329

Superstrate index control of waveguide grating reflectivity

S. Pissadakis, M. N. Zervas, D. A. Sager, and J. S. Wilkinson  »View Author Affiliations


Optics Letters, Vol. 27, Issue 5, pp. 327-329 (2002)
http://dx.doi.org/10.1364/OL.27.000327


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Abstract

Control of reflectivity of a relief grating in a high-index film overlaid on a monomode glass waveguide was achieved by adjustment of the superstrate refractive index with liquids. Weak gratings reflecting at 1531 nm were inscribed by UV laser ablation. The grating reflectivity was measured as the ratio of the transmission outside the reflection band, at 1536 nm, to that at the Bragg wavelength. Reflectivity with an air superstrate was <0.3 dB for both polarizations. In the TE polarization the grating strength increased to 20.5 dB after application of a liquid of index 1.45. In the TM polarization the strength increased to 27 dB with a superstrate index of 1.50. Good agreement was found with a theoretical model based on beam propagation.

© 2002 Optical Society of America

OCIS Codes
(050.1960) Diffraction and gratings : Diffraction theory
(130.0130) Integrated optics : Integrated optics
(130.3120) Integrated optics : Integrated optics devices
(160.3130) Materials : Integrated optics materials
(230.4000) Optical devices : Microstructure fabrication
(240.0310) Optics at surfaces : Thin films

Citation
S. Pissadakis, M. N. Zervas, D. A. Sager, and J. S. Wilkinson, "Superstrate index control of waveguide grating reflectivity," Opt. Lett. 27, 327-329 (2002)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-27-5-327

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