Highly efficient diffraction gratings and resonant plasma layers at IR wavelengths

Johan H. Stiens; Galina A. Nemova; Peter F. Muys; Roger A. Vounckx

doi:10.1117/12.369363

11 November 1999 Highly efficient diffraction gratings and resonant plasma layers at IR wavelengths

Johan H. Stiens, Galina A. Nemova, Peter F. Muys, Roger A. Vounckx

Proceedings Volume 3897, Advanced Photonic Sensors and Applications; (1999) https://doi.org/10.1117/12.369363
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore

Abstract

In this work we investigate the interaction between rectangular-grooved transmission gratings and a resonant plasma layer at IR wavelengths. The gratings are designed to convert quasi-vertically incident light into quasi- horizontally propagating light in a high refractive index GaAs substrate with efficiencies of almost 90 percent in the first diffraction order. This can only be achieved by etching highly asymmetric '(lambda) /4' or '(lambda) ' gratings in a high refractive index material evaporated on the GaAs substrate. The resonant plasma layer (RPL) consists of a very thin highly doped n-GaAs layer whose plasma frequency is almost equal to the frequency of the incident light. Under these conditions Drude's formula shows that the refractive index almost vanishes due to plasma oscillations. The interaction between the diffraction modes and the RPL are investigated and optimized on the base of a rigorous coupled-wave analysis. This analysis reveals to which extent the RPL can influence the distribution of light between the zero and first diffraction orders. In the optimum position of the RPL, the first order diffraction efficiency changes from 90 percent down to 25 percent for a RPL thickness change of 40nm.

Citation Download Citation

Johan H. Stiens, Galina A. Nemova, Peter F. Muys, and Roger A. Vounckx "Highly efficient diffraction gratings and resonant plasma layers at IR wavelengths", Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); https://doi.org/10.1117/12.369363

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