A compact and polarization-insensitive silicon waveguide crossing based on subwavelength grating MMI couplers

Wu, Shoujun; Mao, Simei; Zhou, Lidan; Liu, Lin; Chen, Yujie; Mu, Xin; Cheng, Lirong; Chen, Zhenmin; Tu, Xiaoguang; Fu, H. Y.

doi:10.1364/oe.399568

Cited by 23 publications

(7 citation statements)

References 18 publications

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“…Meta-fibers can also find massive interconnects, signal shaping, biomedical sensing and micro-manipulation applications 232,235 . Device schematics are inspired from previous literatures 12,177,194,235,523,[541][542][543] .…”

Section: Discussionmentioning

confidence: 99%

Optical meta-waveguides for integrated photonics and beyond

et al. 2021

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The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic chip. The integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits, giving rise to numerous meta-waveguides with unprecedented strength in controlling guided electromagnetic waves. Here, we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms, such as dielectric or plasmonic waveguides and optical fibers. Foundational results and representative applications are comprehensively summarized. Brief physical models with explicit design tutorials, either physical intuition-based design methods or computer algorithms-based inverse designs, are cataloged as well. We highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems, by enhancing light-matter interaction strength to drastically boost device performance, or offering a versatile designer media for manipulating light in nanoscale to enable novel functionalities. We further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits, biomedical sensing, artificial intelligence and beyond.

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Section: Discussionmentioning

confidence: 99%

Optical meta-waveguides for integrated photonics and beyond

et al. 2021

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“…Other merits such as performance, compactness or fabrication feasibility may also be considered for different application scenarios. Based on the number of DOF, three types of structures are widely used for inverse design: empirical structure [21][22][23][24][25][26][27][28][29][30][31][32], QR-code like structure [33][34][35][36][37][38][39][40][41][42][43][44][45] and irregular structure [46][47][48][49][50][51][52][53][54][55][56][57][58]. An empirical structure making use of existing classical structures usually has only a few DOF.…”

Section: Inverse Design Schemes For Silicon Photonicsmentioning

confidence: 99%

Inverse Design for Silicon Photonics: From Iterative Optimization Algorithms to Deep Neural Networks

et al. 2021

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Silicon photonics is a low-cost and versatile platform for various applications. For design of silicon photonic devices, the light-material interaction within its complex subwavelength geometry is difficult to investigate analytically and therefore numerical simulations are majorly adopted. To make the design process more time-efficient and to improve the device performance to its physical limits, various methods have been proposed over the past few years to manipulate the geometries of silicon platform for specific applications. In this review paper, we summarize the design methodologies for silicon photonics including iterative optimization algorithms and deep neural networks. In case of iterative optimization methods, we discuss them in different scenarios in the sequence of increased degrees of freedom: empirical structure, QR-code like structure and irregular structure. We also review inverse design approaches assisted by deep neural networks, which generate multiple devices with similar structure much faster than iterative optimization methods and are thus suitable in situations where piles of optical components are needed. Finally, the applications of inverse design methodology in optical neural networks are also discussed. This review intends to provide the readers with the suggestion for the most suitable design methodology for a specific scenario.

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“…[35] Unfortunately, these complex structures are time-consuming to optimize and might contain many fine features beyond the fabrication capabilities. [36][37][38][39][40][41][42] As far as it can be seen, the quest for broadband, compact, and multimode waveguide crossings remains elusive.…”

Section: Introductionmentioning

confidence: 99%

Ultra‐Broadband Multimode Waveguide Crossing via Subwavelength Transmitarray with Bound State

Guo

Wang

Zhang

et al. 2023

Laser & Photonics Reviews

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As a fundamental building block for photonic integrated circuits, waveguide crossing is playing an essential role for routing the increasingly complex network on chip. Driven by the demands for carrying a large capacity of data per waveguide, wavelengths and guiding modes are emerging as important degrees of freedom for optical multiplexing to embrace the advantages of signal parallelism. Although various waveguide crossing structures are proposed to either support broad spectra of wavelengths or a large number of modes, none of these are simultaneously achieved. Here, an ultra-broadband multimode waveguide crossing based on subwavelength transmitarray (SWTA) is proposed. The SWTA is well designed for high transmittance in the propagation direction and excellent confinement in its orthogonal direction by creation of a bound state. A three-mode crossing is designed and fabricated on silicon on insulator with a compact footprint of only 5.05 µm × 5.05 µm. The crossing is able to operate over a large bandwidth from 1.4 to 2.1 µm with an excess loss of less than 0.77 dB. For a proof-of-concept demonstration of the structure scalability, the crossing is predicted to support up to ten modes. The ultra-broadbandwidth and compactness of this multimode crossing make it possible to densely cross connect the waveguides with large data capacity via wavelength and mode division multiplexing.

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A compact and polarization-insensitive silicon waveguide crossing based on subwavelength grating MMI couplers

Cited by 23 publications

References 18 publications

Optical meta-waveguides for integrated photonics and beyond

Optical meta-waveguides for integrated photonics and beyond

Inverse Design for Silicon Photonics: From Iterative Optimization Algorithms to Deep Neural Networks

Ultra‐Broadband Multimode Waveguide Crossing via Subwavelength Transmitarray with Bound State

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