Grating coupler enabled silicon photonics platform for spintronic-photonic memory

Publikation: Bog/antologi/afhandling/rapportPh.d.-afhandlingForskning

Photonic-electronic integration is recently attracting more and more interest, promising to combine the advantages of both platforms: well-established, densely integrated, efficient electronics and photonics offering additional optical functionalities, high bandwidth, and lower energy consumption. Especially silicon photonics offers high integration density, fast modulation and highly efficient out-of-plane coupling. Thus, silicon photonic integrated circuits are being dealt as the most promising contender for large-scale integration with electronics. A solution for vertical co-integration is presented by the means of focusing grating couplers (FGCs), which presents the main effort of this work.

The presented thesis describes the design and experimental characterization of compact out-of-plane FGCs on a silicon photonic platform. The components are characterised by IR imaging and spatially sweeping a tapered-and-lensed fiber across the grating coupler at varying vertical distances. The extracted beam widths and intensity profiles clearly reveal the focusing behaviour. To our knowledge, this makes these grating couplers the first near-vertical out-of-plane FGCs on a standard 220-nm-silicon-on-insulator platform. The 2D FGCs present additionally the first experimentally demonstrated 2D out-of-plane FGCs in a photonic integrated circuit platform. We will argue for the applicability of such components as optical photonic layer couplers to address optically switchable spintronic memory elements.
ForlagAarhus Universitet
Antal sider153
StatusUdgivet - 2020

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