"它能提供极高的数据传输速度、无移动部件的广覆盖范围、支持多条并发链路以及双向通信，同时 还 能 保 持 较 低 的 信 号 损 耗 ， " 印 第 安 纳 州 南 本 德 圣 母 大 学 电 气 工 程 教 授 兰 詹 · 辛 格 (Ranjan Singh) 说。"目前的解决方案通常一次只能实现其中一到两个特性，而且往往依赖于复杂的天线阵列或机械 控制。" 拓扑学——研究形状在形变过程中如何保持某些特性的数学——揭示了光可以在特殊结构材料中沿着 受保护的路径传播，这些路径能够抵抗散射和缺陷。在这款太赫兹天线中，这种拓扑保护机制被设计 成以可控的三维模式向外泄漏信号。 在这项新研究中，研究人员并没有完全抑制泄漏，而是设计了一种芯片，允许部分流经芯片内部的太 赫兹辐射泄漏出去。这种"泄漏波天线"的拓扑设计确保了信号能够平稳传输，而不会出现明显的损耗 或失真，从而提高了带宽和数据传输速率。 同时，由于光在微芯片内传播的方式，当光泄漏出来时，它会呈锥形辐射，从而提供水平和垂直覆 盖，使天线能够覆盖周围三维空间的75%。 公众号记得加星标⭐️，第一时间看推送不会错过。 第六代无线网络（6G）有望利用太赫兹频段实现每 ...

Group 1 - The universe does not have an "outside" as the concept of "outside" requires space and time, which are defined by the universe itself [3][5][11] - The observable universe has a radius of approximately 46.5 billion light-years and a diameter of about 93 billion light-years, but this is only a "horizon" set by the speed of light [5][7] - According to Hubble's law, galaxies that are far enough away are receding from us faster than the speed of light, meaning their light will never reach our observable universe [7][19] Group 2 - Understanding a "boundary-less universe" requires a topological perspective, with three main geometric models: flat infinite universe, closed universe, and open universe [8][11] - The concept of time is also tied to the universe's existence, as time began to have physical meaning only after the Big Bang [13][15] - Inflation theory explains the uniformity of distant galaxies' temperature and matter distribution, as they were once in a small region before being rapidly expanded [17][19] Group 3 - Dark energy, which constitutes about 68.3% of the universe's total energy, drives the accelerated expansion of the universe [19][21] - Potential outcomes of the universe's fate include the "Big Rip," where everything is torn apart, and "heat death," where the universe reaches maximum entropy and becomes a cold void [19][21] - The multiverse theory suggests our universe may be one of many, with different physical laws in each, leading to the anthropic principle that explains why our universe's parameters are suitable for life [21][23] Group 4 - The simulation hypothesis posits that if civilizations can create simulated universes, the number of simulated universes would far exceed real ones, supported by various physical phenomena [25][27] - The idea of the universe being a program raises questions about the nature of reality and existence beyond our perception [27][28] - The ability to contemplate the universe and its mysteries is seen as a significant aspect of human existence, highlighting the unique capacity for thought [28]

Group 1 - The article explores the reasons why shoelaces sometimes stay tied for days while other times they come undone after just a few steps, suggesting a connection to physics and topology [1] - It raises the question of whether headphone wires could serve as a viable alternative to shoelaces, hinting at innovative solutions in fastening technology [1]