Modal behavior of novel silicon-overlay LiNbO3 waveguides

Tiziana Conese-Bond; Robert F. Tavlykaev; Ramu V. Ramaswamy

doi:10.1117/12.298240

22 December 1997 Modal behavior of novel silicon-overlay LiNbO₃ waveguides

Tiziana Conese-Bond, Robert F. Tavlykaev, Ramu V. Ramaswamy

Proceedings Volume 3290, Optoelectronic Integrated Circuits II; (1997) https://doi.org/10.1117/12.298240
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

LiNbO₃ waveguides with Si overlays are emerging as a basic building block for a variety of integrated-optic components. However, the development and optimization of these devices are, in large part, hindered by the lack of understanding of the specifics of the Si-on-LiNbO₃ structure which appear to differ dramatically from those of the Si and LiNbO₃ waveguides, considered separately. In this work, we provide a specific insight into the waveguiding properties of vertically stacked Si-on-LiNbO₃ waveguides. In particular, we present a detailed theoretical analysis of the effect of the Si film on the modal characteristics (propagation constant and field distribution) of the structure. We show that for approximately 70% of all Si thicknesses, in the range from 0 to 1.6 micrometer, the highest-order normal mode of the entire structure has more than 99.9% of the total energy confined in the LiNbO₃ region, i.e., beneath the Si overlay. This fact is quite intriguing given the fact a planar Si layer of submicron thickness on bulk LiNbO₃ is already multi-moded. Furthermore, we show that the effective mode index of the structure is considerably modified compared to that of the LiNbO₃ waveguide while the propagation loss is, on the other hand, practically unaffected (approximately 0.3 dB/cm) even in the presence of the lossy Si film, as confirmed by our previous experimental results. Evidently, large modulation of the effective index and low-loss propagation provide an ideal combination of properties suitable for the fabrication of high-reflectance corrugated waveguide gratings, essential for a number of practical devices, in particular, WDM filters.

Citation Download Citation

Tiziana Conese-Bond, Robert F. Tavlykaev, and Ramu V. Ramaswamy "Modal behavior of novel silicon-overlay LiNbO₃ waveguides", Proc. SPIE 3290, Optoelectronic Integrated Circuits II, (22 December 1997); https://doi.org/10.1117/12.298240

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KEYWORDS

Silicon

Waveguides

Dispersion

Channel waveguides

Wave propagation

Planar waveguides

Refractive index

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