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Proceedings Paper

CMOS-compatible electro-optical Mach-Zehnder modulator based on the amorphous silicon technology
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Paper Abstract

The realization of on-chip optical interconnects requires the integration of active micro-optical devices with microelectronics. However, it is not clear yet how silicon photonics could be integrated within CMOS chips. In this context the non-crystalline forms of silicon, such as laser-annealed polycrystalline and hydrogenated amorphous silicon (a-Si:H), can deserve some advantages as they can be included almost harmlessly everywhere in a CMOS typical run-sheet, yielding low-cost and flexible fabrication. In particular, a-Si:H can be deposited using the CMOS-compatible low temperature plasma enhanced chemical vapour deposition (PECVD) technique, which brings clear advantages particularly for a back-end photonic integrated circuit (PIC) integration. However, till now a-Si:H has been mainly considered for the objective of passive optical elements within a photonic layer at λ=1.55 μm. Only a small number of examples have been reported, in fact, on waveguide integrated active devices. In this paper we detail about an effective refractive index variation obtained through an electrically induced carrier depletion in an as-deposited a-Si:H-based p-i-n waveguiding device. For this device switch-on and switch-off times of ~2 ns were measured allowing a modulation rate higher than 150 MHz.ÿÿ

Paper Details

Date Published: 12 May 2012
PDF: 9 pages
Proc. SPIE 8431, Silicon Photonics and Photonic Integrated Circuits III, 84310U (12 May 2012); doi: 10.1117/12.922237
Show Author Affiliations
Sandro Rao, Univ. degli Studi Mediterranea di Reggio Calabria (Italy)
Giuseppe Coppola, Institute for Microelectronics and Microsystems, CNR (Italy)
Mariano A. Gioffrè, Institute for Microelectronics and Microsystems, CNR (Italy)
Francesco G. Della Corte, Univ. degli Studi Mediterranea di Reggio Calabria (Italy)
Institute for Microelectronics and Microsystems, CNR (Italy)


Published in SPIE Proceedings Vol. 8431:
Silicon Photonics and Photonic Integrated Circuits III
Laurent Vivien; Seppo K. Honkanen; Lorenzo Pavesi; Stefano Pelli, Editor(s)

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