Dispersion engineering with inverse design (Conference Presentation)

Dries Vercruysse; Rahul Trivedi; Logan Su; Neil Sapra; Jelena Vuckovic

doi:10.1117/12.2528912

9 September 2019 Dispersion engineering with inverse design (Conference Presentation)

Dries Vercruysse, Rahul Trivedi, Logan Su, Neil Sapra, Jelena Vuckovic

Proceedings Volume 11105, Novel Optical Systems, Methods, and Applications XXII; 111050S (2019) https://doi.org/10.1117/12.2528912
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States

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.

Conference Presentation

Citation Download Citation

Dries Vercruysse, Rahul Trivedi, Logan Su, Neil Sapra, and Jelena Vuckovic "Dispersion engineering with inverse design (Conference Presentation)", Proc. SPIE 11105, Novel Optical Systems, Methods, and Applications XXII, 111050S (9 September 2019); https://doi.org/10.1117/12.2528912

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KEYWORDS

Dispersion

Optical design

Slow light

Waveguides

Integrated optics

Light-matter interactions

Modulators

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