Amorphous silicon optical waveguides and Bragg mirrors

A. Khanna; M. Mulot; S. Arpiainen; A. Säynätjoki; J. Ahopelto; S. Honkanen; H. Lipsanen

doi:10.1117/12.781237

1 May 2008 Amorphous silicon optical waveguides and Bragg mirrors

A. Khanna, M. Mulot, S. Arpiainen, A. Säynätjoki, J. Ahopelto, S. Honkanen, H. Lipsanen

Proceedings Volume 6996, Silicon Photonics and Photonic Integrated Circuits; 699605 (2008) https://doi.org/10.1117/12.781237
Event: SPIE Photonics Europe, 2008, Strasbourg, France

Abstract

We study 200 nm thick hydrogenated amorphous silicon (a-Si:H) optical strip waveguides fabricated by Plasma Enhanced Chemical Vapor Deposition (PECVD) technique over PECVD silicon oxide on top of standard silicon wafer. The layer of a-Si:H is etched by Reactive Ion Etching (RIE). The ability to deposit a-Si:H at low temperatures (~250°C) by PECVD renders it a promising material for integration of optical waveguides with microelectronics. Waveguides with width varying from 2 μm to 10 μm exhibit low loss. Material refractive index data of a-Si:H is measured by reflectometry and is used in simulations. A high refractive index contrast between a-Si:H and air allows tight optical confinement of modes. We demonstrate Bragg gratings fabricated by e-beam writing technology on top of the waveguides. The period of the grating is approximately 300 nm and the depth of the grooves is about 30 nm. The grating on top of the waveguide act as mirror.

Citation Download Citation

A. Khanna, M. Mulot, S. Arpiainen, A. Säynätjoki, J. Ahopelto, S. Honkanen, and H. Lipsanen "Amorphous silicon optical waveguides and Bragg mirrors", Proc. SPIE 6996, Silicon Photonics and Photonic Integrated Circuits, 699605 (1 May 2008); https://doi.org/10.1117/12.781237

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