概括
这项研究引入了一种新的方法,用于使用可调节材料在连续体 (BICs) 中主动控制有限状态. 该技术允许操纵BIC动态和手术效果,即使有物质损失,保持高质量因素.
科学领域:
- 光子学 是一个光子学.
- 超材料是什么?超材料是什么?
- 光学工程是指光学工程.
背景情况:
- 连续 (BICs) 设备中的常规有限状态依赖于被动结构几何.
- 实现对BIC的动态控制通常需要复杂的设计,通常会导致被动设备.
- 引入可调节材料为积极和可重新配置的BIC半导体提供了一条道路.
研究的目的:
- 开发一种损失兼容的机制来操纵连续 (BIC) 中的绑定状态.
- 为了证明对光子系统中BIC动态和手术效应的积极控制.
- 探索材料损失在BIC操纵中的作用,同时保持超高的Q系数.
主要方法:
- 在镜子辅助的光子晶体板中利用远场干扰.
- 使用的材料具有可调节的导电率 (折射率和损耗),经历无形-晶体相变.
- 进行模拟来分析BIC特性和手术效应的调制.
主要成果:
- 证明了一个损失兼容的BIC操纵机制,其中物质损失与超高的Q因子共存.
- 通过材料属性调制展示了BICs的拓电荷的活跃切换.
- 实现了对准BICs的手术效果的多维控制,包括可转向的方向性和广泛的手术性连续性.
结论:
- 这些发现为构建活跃的BIC半端服务提供了一条新路线.
- 这项工作突出了对超高Q光子系统动态控制的内在材料损失的潜力.
- 开发的机制使积极的功能和更深入地探索损失驱动的BIC动态成为可能.
相关概念视频
01:21Boundary Conditions: Lossless Lines
79
Consider a single-phase, two-wire, lossless transmission line terminated by an impedance at the receiving end and a source with Thevenin voltage and impedance at the sending end. The line, with length, has a surge impedance and wave velocity determined by the line's inductance and capacitance.
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
At the receiving end, the boundary condition states that the voltage equals the product of the receiving-end impedance and current. This relationship is expressed as a function of the incident and...
79
01:24BIBO stability of continuous and discrete -time systems
331
System stability is a fundamental concept in signal processing, often assessed using convolution. For a system to be considered bounded-input bounded-output (BIBO) stable, any bounded input signal must produce a bounded output signal. A bounded input signal is one where the modulus does not exceed a certain constant at any point in time.
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
To determine the BIBO stability, the convolution integral is utilized when a bounded continuous-time input is applied to a Linear Time-Invariant (LTI) system....
331
01:23Lossless Lines
108
In electrical engineering, a lossless transmission line is characterized by a purely imaginary propagation constant and a resistive characteristic impedance. The ABCD parameters, which describe the relationship between the input and output voltages and currents, indicate an equivalent π circuit with an imaginary series impedance and a shunt admittance. This results in a transmission line that, when the product of the phase constant (beta) and the length of the line is less than pi,...
108
01:22Lossy Lines and Overvoltages
81
Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...
81
01:23Stability of Equilibrium Configuration
429
Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
429
01:16Conservation of Mass in Finite Cotrol Volume
929
The principle of conservation of mass is a fundamental law in fluid mechanics and is applied using the continuity equation. We apply the concept to a finite control volume to derive the continuity equation.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
A system is defined as a collection of unchanging contents, and the conservation of mass states that a system's mass is constant.
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