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Silicon-on-Silica Microring Resonators for High-Quality, High-Contrast, High-Speed All-Optical Logic Gates.

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Title: Silicon-on-Silica Microring Resonators for High-Quality, High-Contrast, High-Speed All-Optical Logic Gates.
Authors: Kotb, Amer1,2 (AUTHOR), Hatziefremidis, Antonios2,3 (AUTHOR), Zoiros, Kyriakos E.3,4 (AUTHOR)
Source: Nanomaterials (2079-4991). Nov2025, Vol. 15 Issue 22, p1736. 26p.
Subjects: Optical computing, Quality factor, Optical information processing, Silica, Optical resonators, Wavelength measurement, Integrated optics
Abstract: With the increasing demand for ultrafast optical signal processing, silicon-on-silica (SoS) waveguides with ring resonators have emerged as a promising platform for integrated all-optical logic gates (AOLGs). In this work, we design and simulate a SoS-based waveguide structure, operating at the telecommunication wavelength of 1550 nm, consisting of a circular ring resonator coupled to straight bus waveguides using Lumerical FDTD solutions. The design achieves a high Q-factor of 11,071, indicating low optical loss and strong light confinement. The evanescent coupling between the ring and waveguides, along with optimized waveguide dimensions, enables efficient interference, realizing a complete suite of AOLGs (XOR, AND, OR, NOT, NOR, NAND, and XNOR). Numerical simulations demonstrate robust performance across all gates, with high contrast ratios between 11.40 dB and 13.72 dB and an ultra-compact footprint of 1.42 × 1.08 µm2. The results confirm the device's capability to manipulate optical signals at data rates up to 55 Gb/s, highlighting its potential for scalable, high-speed, and energy-efficient optical computing. These findings provide a solid foundation for the future experimental implementation and integration of SoS-based photonic logic circuits in next-generation optical communication systems. [ABSTRACT FROM AUTHOR]
Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Label: Title
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  Data: Silicon-on-Silica Microring Resonators for High-Quality, High-Contrast, High-Speed All-Optical Logic Gates.
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  Data: <searchLink fieldCode="DE" term="%22Optical+computing%22">Optical computing</searchLink><br /><searchLink fieldCode="DE" term="%22Quality+factor%22">Quality factor</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+information+processing%22">Optical information processing</searchLink><br /><searchLink fieldCode="DE" term="%22Silica%22">Silica</searchLink><br /><searchLink fieldCode="DE" term="%22Optical+resonators%22">Optical resonators</searchLink><br /><searchLink fieldCode="DE" term="%22Wavelength+measurement%22">Wavelength measurement</searchLink><br /><searchLink fieldCode="DE" term="%22Integrated+optics%22">Integrated optics</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: With the increasing demand for ultrafast optical signal processing, silicon-on-silica (SoS) waveguides with ring resonators have emerged as a promising platform for integrated all-optical logic gates (AOLGs). In this work, we design and simulate a SoS-based waveguide structure, operating at the telecommunication wavelength of 1550 nm, consisting of a circular ring resonator coupled to straight bus waveguides using Lumerical FDTD solutions. The design achieves a high Q-factor of 11,071, indicating low optical loss and strong light confinement. The evanescent coupling between the ring and waveguides, along with optimized waveguide dimensions, enables efficient interference, realizing a complete suite of AOLGs (XOR, AND, OR, NOT, NOR, NAND, and XNOR). Numerical simulations demonstrate robust performance across all gates, with high contrast ratios between 11.40 dB and 13.72 dB and an ultra-compact footprint of 1.42 × 1.08 µm2. The results confirm the device's capability to manipulate optical signals at data rates up to 55 Gb/s, highlighting its potential for scalable, high-speed, and energy-efficient optical computing. These findings provide a solid foundation for the future experimental implementation and integration of SoS-based photonic logic circuits in next-generation optical communication systems. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Nanomaterials (2079-4991) is the property of MDPI and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.3390/nano15221736
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        Text: English
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      – SubjectFull: Optical information processing
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      – SubjectFull: Silica
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      – SubjectFull: Optical resonators
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      – SubjectFull: Wavelength measurement
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      – SubjectFull: Integrated optics
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      – TitleFull: Silicon-on-Silica Microring Resonators for High-Quality, High-Contrast, High-Speed All-Optical Logic Gates.
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              Text: Nov2025
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