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Proceedings Paper

Germanium on silicon to enable integrated photonic circuits
Author(s): F. Kenneth Hopkins; Kevin M. Walsh; Alexander Benken; John Jones; Kent Averett; Darnell E. Diggs; Loon-Seng Tan; Shin Mou; James G. Grote
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Paper Abstract

Electronic circuits alone cannot fully meet future requirements for speed, size, and weight of many sensor systems, such as digital radar technology and as a result, interest in integrated photonic circuits (IPCs) and the hybridization of electronics with photonics is growing. However, many IPC components such as photodetectors are not presently ideal, but germanium has many advantages to enable higher performance designs that can be better incorporated into an IPC. For example, Ge photodetectors offer an enormous responsivity to laser wavelengths near 1.55μm at high frequencies to 40GHz, and they can be easily fabricated as part of a planar silicon processing schedule. At the same time, germanium has enormous potential for enabling 1.55 micron lasers on silicon and for enhancing the performance of silicon modulators. Our new effort has begun by studying the deposition of germanium on silicon and beginning to develop methods for processing these films. In initial experiments comparing several common chemical solutions for selective etching under patterned positive photoresist, it was found that hydrogen peroxide (H2O2) at or below room temperature (20 C) produced the sharpest patterns in the Ge films; H2O2 at a higher temperature (50 C) resulted in the greatest lateral etching.

Paper Details

Date Published: 24 September 2013
PDF: 5 pages
Proc. SPIE 8876, Nanophotonics and Macrophotonics for Space Environments VII, 88760X (24 September 2013); doi: 10.1117/12.2025186
Show Author Affiliations
F. Kenneth Hopkins, Air Force Research Lab. (United States)
Kevin M. Walsh, Univ. of Louisville (United States)
Alexander Benken, Univ. of Louisville (United States)
John Jones, Air Force Research Lab. (United States)
Kent Averett, Air Force Research Lab. (United States)
Darnell E. Diggs, Air Force Research Lab. (United States)
Loon-Seng Tan, Air Force Research Lab. (United States)
Shin Mou, Air Force Research Lab. (United States)
James G. Grote, Air Force Research Lab. (United States)


Published in SPIE Proceedings Vol. 8876:
Nanophotonics and Macrophotonics for Space Environments VII
Edward W. Taylor; David A. Cardimona, Editor(s)

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