Affiliation:
1. Southwest Medical University
2. Medical Engineering & Medical Informatics Integration and Transformational Medicine of Luzhou Key Laboratory
3. Luzhou Vocational & Technical College
4. Chongqing Key Laboratory of Photo-Electric Functional Materials
Abstract
All-optical logic gates have been studied intensively owing to their potential to enable broadband, low-loss and high-speed communications. However, poor tunability has remained a key challenge in this field. In this work, we propose a Y-shaped structure composed of Yttrium Iron Garnet (YIG) layers that can serve as tunable all-optical logic gates, including, but not limited to, OR, AND and NOT gates, by applying external magnetic fields to magnetize the YIG layers. Our findings reveal that these logic gates are founded on protected one-way edge modes, where by tuning the wavenumber k of the operating mode to a sufficiently small (or even zero) value, the gates can become nearly immune to nonlocal effects. This not only enhances their reliability but also allows for maintaining extremely high precision in their operations. Furthermore, the operating band itself of the logic gates is also shown to be tunable. We introduce a straightforward and practical method for controlling and switching these gates between "work", "skip", and "stop" modes. These findings have potentially significant implications for the design of high-performance and robust all-optical microwave communication systems.
Funder
Innovation Laboratory of Advanced Medical Material & Physical Diagnosis and Treatment Technology
Science and Technology Strategic Cooperation Programs of Luzhou Municipal People’s Government and Southwest Medical University
Sichuan Province Science and Technology Support Program
Open Research Fund of Luzhou Key Laboratory of Intelligent Control and Application of Electronic Devices
Natural Science Foundation of Sichuan Province
Hellenic Foundation for Research and Innovation
General Secretariat for Research and Technology
Subject
Atomic and Molecular Physics, and Optics