Power transfer in magnetoelectric resonators

基于非线性微机械谐振器的光无线信息传输

Optical Wireless Information Transfer with Nonlinear Micromechanical Resonators

无线信息传输是现代通信的基础。它包括蜂窝、WiFi、蓝牙和GPS系统，所有这些系统都使用电磁无线电波，频率范围通常从100 MHz到几GHz。然而，标准无线电波无线传输仍然存在一些长期存在的挑战，包括保持数据的安全传输免受潜在的危害。在这里，我们展示了无线信息传输使用的视线光学架构与微机械元件。在这种全新的方法中，用信息编码的激光束撞击位于离激光器一定距离处的非线性微机械谐振器。由激光的辐射压力在非线性微机械谐振器上产生的力产生边带调制信号，该边带调制信号携带在辐射压力的细微变化中编码的精确信息。使用这个，我们证明了数据和图像传输与100%的保真度与一个单一的96微米270微米的硅谐振器元件在光频带。这种机械方法仅依赖于入射光子的动量，因此能够使用比射频频带宽10，000倍的光频带的任何部分。我们的视线架构，使用高度可扩展的微机械谐振器提供了新的可能性，在无线通信。由于它们的小尺寸，这些谐振器可以容易地排列，同时保持小的形状因子以提供冗余和并行性。

Demonstration of a strain-mediated magnetoelectric write and read unit in a Co60Fe20B20/ Pb(Mg1/3Nb2/3)0.7Ti0.3O3 heterostructure

Taking advantage of the Magnetoelectric (ME) and its inverse effect, this article demonstrates strain-mediated magnetoelectric write and read operations simultaneously in Co60Fe20B20/ Pb(Mg1/3Nb2/3)0.7Ti0.3O3 heterostructures without using any symmetry breaking magnetic field at room temperature. By applying an external DC-voltage across a (011)-cut PMN-PT substrate, the ferroelectric polarization is re-oriented, which results in an anisotropic in-plane strain that transfers to the CoFeB thin film and changes its magnetic anisotropy Hk. The change in Hk in-turn results in a 90o rotation of the…

Mid-Range Wireless Power Transfer at 100 MHz using Magnetically-Coupled Loop-Gap Resonators

We describe efficient four-coil inductive power transfer (IPT) systems that operate at 100 MHz. The magnetically-coupled transmitter and receiver were made from electrically-small and high-Q loop-gap resonators (LGRs). In contrast to the commonly-used helical and spiral resonators, the LGR design has the distinct advantage that electric fields are strongly confined to the capacitive gap of the resonator. With negligible fringing electric fields in the surrounding space, the IPT system is immune to interference from nearby dielectric objects, even when they are in close proximity to the transmi…

基于腔体多模谐振器的房间尺度磁准静态无线电力传输

Room-scale magnetoquasistatic wireless power transfer using a cavity-based multimode resonator

本文提出利用腔体多模准静态谐振实现房间尺度无线输电，通过导电表面多方向电流激发多个三维磁场本征模，在3m×3m×2m房间内实现超过37.1%的效率和50W以上潜在输电能力。

使用基于Halbach阵列的谐振器抑制无线电力传输中的漏磁场

Suppressing Leakage Magnetic Field in Wireless Power Transfer using Halbach Array-Based Resonators

本文提出一种基于Halbach阵列绕制策略并经进化算法优化的无铁氧体线圈设计，通过产生单侧聚焦的非对称磁场抑制漏磁，在保持96.0%效率的同时将75 mm处磁场强度降低86.6%，可在不增加磁场暴露下传输超过50倍功率。

Analysis of a Wireless Power Transfer System Based on the Interaction of Very High Permittivity Dielectric Resonators with a Contained Aqueous Solution

An ab-initio analysis based on coupled mode theory (CMT) is applied to describe the interaction dynamics of high dielectric resonators (DRs) with its containing aqueous solution. We prove that the coupling mechanism is reciprocal. Such property is exploited to find closed form and accurate expressions of the coupling coefficient, the main factor characterizing the system performance. Based on such expressions, it is shown that, for wireless power transfer (WPT) applications, up sizing the DRs relaxes the need of using ultra high dielectric constant materials. The nature of interaction is captu…

补丁壁准静态腔体用于三维无线电力传输

Patched-Wall Quasistatic Cavity Resonators for 3-D Wireless Power Transfer

本文提出补丁壁准静态腔体结构，通过导电壁段与电容连接，实现无内部障碍的全体积覆盖，提升三维无线充电效率。

可重构形状无线电能传输表面的无源电抗补偿

Passive Reactance Compensation for Shape-Reconfigurable Wireless Power Transfer Surfaces

针对可重构形状二维中继谐振器阵列中交叉耦合导致的阻抗失谐和功率死区问题，本研究提出一种无源电抗补偿机制，通过机械附加电抗元件抵消失谐，在固定频率下同时激活所有谐振器，消除了死区并将最低传输效率从3.0%提升至56.8%。

超材料控制的非厄米无线电力传输系统中的宇称-时间对称性

Metamaterial-Controlled Parity-Time Symmetry in Non-Hermitian Wireless Power Transfer Systems

本文提出一种利用超材料控制PT对称性的多体无线电力传输系统，通过逆向设计调节耦合系数，在强耦合区域实现稳定的PT对称态，支持自由定位WPT应用。

重构基于分层谐振器的房间级磁 quasi 静态无线电力传输

Hierarchical resonators for localized charging in room-scale magnetoquasistatic wireless power systems

本文提出分层谐振器用于房间级磁 quasi 静态无线电力传输，通过选择性激活中继器提升效率，实现对微型设备的局部能量供应，实验显示效率提升两个数量级，最高可传输500mW至15mm接收器。

Radiative Heat Transfer in Free-Standing Silicon Nitride Membranes

Free-standing silicon nitride (SiN) mechanical resonators are of central interests in applications such as temperature and mass sensing, and for fundamental optomechanical reasearch. Understanding thermal coupling between a membrane resonator and its environment is required for predicting thermal noise, frequency noise, as well as sensors responses to temperature changes. In this work, we provide closed-form derivations of intrinsic thermal coupling quantities in free-standing thin films, namely total thermal conductance with the surroundings, thermal response time, and the relative contributi…

利用一对注入锁定到 Kerr 微谐振腔孤子光梳的分布反馈激光器进行光混频产生的低相位噪声太赫兹波实现 560 GHz 频段无线数据传输

Wireless data transmission in a 560-GHz band using low-phase-noise terahertz wave generated by photomixing of a pair of distributed feedback lasers injection-locking to Kerr micro-resonator soliton comb

本文提出用注入锁定至 Kerr 孤子光梳的 DFB 激光器光混频产生低相位噪声 560 GHz 载波，实验验证 OOK、BPSK、QPSK 与 16QAM 高速无线传输。

铌酸锂表面声波谐振器用于甚高频隔离功率转换

Lithium Niobate Surface-Acoustic-Wave Resonator for Very-High-Frequency Isolated Power Conversion

本研究展示了一种40-MHz铌酸锂SAW谐振器，通过电隔离IDT和布拉格反射镜实现隔离功率转换，达到25.7 W输出功率、93.8%峰值效率和2.17 kV隔离电压，推进了无磁高频功率转换器的发展。