GUIDING, SHAPING AND AMPLIFYING SIGNALS INSTRONGLY COUPLED ELECTROMAGNETICMAGNONICCIRCUITS

未来无线通信的发展需要增加带宽，降低能耗，并将尺寸缩小到纳米级。实现这些目标需要结合集成光子学、微波技术、材料科学、纳米物理和基于磁的信息处理等方面的知识。因此，磁振学可以发挥关键作用，磁振学是一种利用低能量磁激发（或自旋波）进行信号传输和逻辑运算的领域。磁振子携带信息的频率范围从千兆赫到太赫兹，其波长比相同频率的电磁波短几个数量级，这使得磁振子具有小型化的吸引力。缺点是，由于色散不同，耦合和转换磁信号到光子信号是具有挑战性的。现有的电磁波与自旋波耦合的方法主要是电感式的，包括微带线和共面波导，其灵敏度、可扩展性和能量效率有待提高。此外，控制磁信号在波导中的传播受到控制磁信号的内部磁相互作用的阻碍。为了进一步发展，需要新的机制和实现概念来增强光子-磁振子耦合，以使电磁-磁振子电路用于微波和磁振技术。本理论计画的主要目标是展望用于资料处理和通讯的磁光子耦合装置的新概念，并建立适合数值模拟的理论模型，并通过实际的数值模拟来评估其实际可行性和实用性。进一步的分析工作旨在找出磁子-光子信号转换的潜在物理机制，并确定合适的磁性有序材料，这些材料允许通过附加的外部参数（如电压和静态磁场）进行数据处理。一般逻辑运算的概念将被发展和模拟集成在磁光子电路中。为了实现这些目标，将开发电磁波-自旋波耦合系统的分析和计算模型。这些将用于设计适合与自旋波耦合的低TE/TM模式微波场模式的微波谐振元件，以及研究基于环形谐振器的磁子学模式，包括非线性自旋动力学。为了提高有效性，将研究通过设计谐振器材料来增加磁功率。此外，我们将研究局部磁化激励来控制微波电路，同时为了提高耦合强度，我们将开发铁电-介电-磁电路，并测试使用超导材料和合成反铁磁材料来提高100 GHz以上的工作频率。

Future progress of wireless communication requires the increase of the bandwidth, decreasing the energy consumption, and downscaling the size to the nanoscale. Working towards these goals entails combining knowledge from integrated photonics, microwave technology, materials science, nanoscale physics and magnetic-based information processing. Thereby, a key role can be played by magnonics, a field that harnesses low-energy magnetic excitations (or spin waves) for signal transmission and logic operation. Magnons carry information in broad frequency range from GHz up to THz and their wavelength is few orders of magnitude shorter than electromagnetic waves with same frequencies, which make magnons attractive for miniaturization. On the downside, coupling and converting magnetic to photonic signals is challenging due to different dispersions. State-of-the-art approaches of coupling electromagnetic waves to spin waves are mainly inductive involving microstrip lines and coplanar waveguides, whose sensitivity, scalability and energy efficiency need to be improved. Furthermore, controlling the propagation of magnonic signals in waveguides is hindered by internal magnetic interactions that control magnonic signals. For a further advance, new mechanisms and implementation concepts for enhancing the photon-magnon coupling are needed to render electromagnetic-magnonic circuits for use in the microwave and magnonic technology. The main objectives of this theory project are to envision new concepts for coupled magnonic-photonic devices for data processing and communication, and to formulate theoretical models amenable to numerical simulations, and to assess by realistic numerical modelling their practical feasibility and usefulness. Further analytical works aim at working out the underlying physical mechanisms for magnon-photon signal conversion and at identifying the suitable magnetically ordered materials that allow data processing by additional external parameters such as electric voltages and static magnetic fields. Concepts for generic logic operations will be developed and simulated for integration in magnonic-photonic circuits. To achieve these goals analytical and computational models for electromagnetic wave-spin wave coupled systems willbe developed. These will be used for designing microwave resonant elements with microwave field pattern of low TE/TM modes suitable for coupling with spin waves, and for studying ring resonator-based magnonic-photonics modes, including non-linear spin dynamics. To improve usefulness an increased magnonic power via resonator materials design will be investigated. Furthermore, we will study of the local magnetization excitations to control microwave circuits, while to enhance the coupling strength we will develop ferroelectric-dielectric-magnonic circuits and test the use of superconducting materials and synthetic antiferromagnetic materials to enhance the operational frequency above 100 GHz.