Advances in Optical and Electrical Integrated Circuits with Symmetry/Asymmetry

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 31 December 2025 | Viewed by 2325

Special Issue Editor


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Guest Editor
Department of Electrical and Electronic Engineering, Tokyo Institute of Technology, Chome-12-1 Ookayama, Meguro City, Tokyo
Interests: photonic integrated circuits; photonic integration platforms; electro–optic materials; magneto–optic materials; topological photonics; photonic crystals; metamaterials; plasmons
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Special Issue Information

Dear Colleague,

Optical integrated circuits refer to the miniaturization of optical systems, integrating several optical functions onto a single chip. They have the potential to revolutionize communications, computing, and sensing, by providing fast, compact, energy-efficient, and cost-effective solutions. Electrical integrated circuits, on the other hand, are a well-established technology which form the basis of modern electronics, with applications in virtually all electronic devices. Symmetry and asymmetry in the context of integrated circuits could refer to the physical layout of the circuit (symmetrical vs. asymmetrical design) or to the properties of the materials and components used (for example, a material might exhibit different properties in different directions, a phenomenon known as anisotropy). Asymmetric designs can have several advantages. For instance, they can allow for more efficient use of space, which can be particularly important in the miniaturized world of integrated circuits. They also can provide a way to break symmetry-induced degenerates, leading to new functionalities.

The goal of this Special Issue is to share and discuss various aspects of optical and electrical integrated circuits.

Prof. Dr. Kensuke Ogawa
Guest Editor

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Published Papers (1 paper)

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Research

18 pages, 6130 KiB  
Article
The Role of Asymmetry on the Resonances of Conjoined Split-Ring Resonators
by Mei Zhu, Xitao Wang, Lian Zhang, Jiguo Geng and Jun Chen
Symmetry 2025, 17(3), 332; https://doi.org/10.3390/sym17030332 - 22 Feb 2025
Viewed by 1826
Abstract
The conjoined split-ring resonator (Co-SRR) is proposed as the unit cell to construct terahertz (THz) metamaterial. The size and position of the gaps on both sides of the structure were adjusted, and the impact on the electromagnetic response to the incident THz wave [...] Read more.
The conjoined split-ring resonator (Co-SRR) is proposed as the unit cell to construct terahertz (THz) metamaterial. The size and position of the gaps on both sides of the structure were adjusted, and the impact on the electromagnetic response to the incident THz wave was investigated via simulation. Results show that by properly controlling the structural asymmetry, the resonances can be tuned simultaneously or independently. The devices exhibit frequency shifts of up to 510 GHz, a tuning range of free spectral range (FSR) as wide as 613 GHz, and a high modulation depth (MD) of 93.4%. Additionally, a wide range of amplitude modulation can occur across multiple frequencies. Incorporating spatial asymmetry further enhances the performance, resulting in a high quality factor (Q) of 44.8 and a figure of merit (FOM) of 40.1. The impressive characteristics prove that Co-SRR-based metamaterial is a great candidate for applications in optical sensing, switching, filtering and programming devices. Full article
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