Electro-absorption and electro-refraction in Ge/SiGe coupled quantum wells (CQW) grown on Si have been investigated by means of optical transmission measurements. The separate confinement of electrons and holes in the heterostructure gives rise to an anomalous Quantum Confined Stark Effect (QCSE) that can be exploited to strongly enhance the electro refractive effect with respect to uncoupled quantum wells. A refractive index variation up to 2.3 x 10-3 has been measured at 1.5 V, with an VπLπ of 0.046 V cm. This result is very promising for the realization of an efficient and compact phase modulator based on the Ge/SiGe material system.
Jacopo Frigerio, Vladyslav Vakarin, Papichaya Chaisakul, Andrea Ballabio, Daniel Chrastina, Xavier Le Roux, Laurent Vivien, Giovanni Isella, and Delphine Marris-Morini, "Electro-absorption and electro-refraction in Ge/SiGe coupled quantum wells," Proc. SPIE 9891, Silicon Photonics and Photonic Integrated Circuits V, 989113 (Presented at SPIE Photonics Europe: April 05, 2016; Published: 13 May 2016); https://doi.org/10.1117/12.2228856.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 14,000 conference presentations, including many plenary and keynote presentations.