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Dispersion engineering with inverse design (Conference Presentation)
Author(s): Dries Vercruysse; Rahul Trivedi; Logan Su; Neil Sapra; Jelena Vuckovic

Paper Abstract

Slow light photonic crystal waveguides (PCW) are a promising tool for optical signal processing as well as integrated optical devices that require strong light-matter interactions, such as modulators or non-linear devices. However, the low group velocity that characterizes these PCWs is typically accompanied by a large group velocity dispersion (GVD), and a low coupling efficiency. Improving both these properties for a large bandwidth forms the design challenge of most optical devices that rely on PCWs. In this work, we use inverse design methods to, firstly, design slow light PWCs with a large group index-bandwidth product (GBP), and secondly, to design couplers for the PCW, i.e. a mode converter, which couples a ridge waveguide to the PCW, and a grating coupler, which couples free space light directly to the PCW slow light mode. Both couplers are optimized for the PCW’s low group velocity dispersion bandwidth. Unlike pre-existing work, we perform the PCW optimization in full 3D simulations which result in more accurate and fully fabricable devices. The high degrees of freedom associated with inverse design makes it an effective method for these problems and, as such, an essential design tool to optimize future PCW applications.

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11105, Novel Optical Systems, Methods, and Applications XXII, 111050S (9 September 2019); doi: 10.1117/12.2528912
Show Author Affiliations
Dries Vercruysse, Stanford Univ. (United States)
Rahul Trivedi, Stanford Univ. (United States)
Logan Su, Stanford Univ. (United States)
Neil Sapra, Stanford Univ. (United States)
Jelena Vuckovic, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 11105:
Novel Optical Systems, Methods, and Applications XXII
Cornelius F. Hahlweg; Joseph R. Mulley, Editor(s)

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