{
  "id": 7739670,
  "title": "How do you design an invisibility cloak?",
  "url": "https://urgent.news/2026/09/16/how-do-you-design-an-invisibility-cloak",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-16T07:53:57.000Z",
  "source": {
    "name": "Physics World",
    "slug": "physics-world",
    "url": "https://physicsworld.com/a/how-do-you-design-an-invisibility-cloak/"
  },
  "original_language": "en",
  "account": "Invisibility cloaks utilize metamaterials, which are engineered to have specific properties that arise from their internal design rather than the material itself. These cloaks work by causing waves—such as light, sound, or other types—to bend around an object and then recombine on the other side, resulting in less scattering of the waves. Two key mathematical equations are involved in designing these metamaterials: the Laplace equation and the Helmholtz equation.\n\nThe Laplace equation deals with steady-state conditions without oscillations, having one free parameter, making it relatively straightforward to use but often limited in the properties it can produce. In contrast, the Helmholtz equation describes oscillations, like sound or light waves, and typically requires two material parameters, offering a more powerful but complex approach.\n\nRecent research from a team of scientists from China and Singapore aims to combine the strengths of both equations. They developed a mathematical link between the Laplace and Helmholtz equations, enabling the design of metamaterials with novel properties. Surprisingly, their \"less-for-more\" approach suggests that simpler designs can achieve more desirable effects. This method doesn't aim to control every aspect of wave behavior but rather begins with a simpler problem to uncover a broad range of useful outcomes.\n\nTo validate their concept, the researchers used acoustics as a testbed and demonstrated several innovative phenomena, including three-dimensional freeform conformal cloaking, a waveguide cloak, and hyperbolic invisibility. Since their technique relies on equations applicable to multiple types of waves, it could potentially be extended to water waves and electromagnetic waves, making it a versatile strategy for designing metamaterials. Although real-world devices may still encounter challenges like losses, dispersion, and approximating continuous material properties with fabricated structures, this new work provides a practical method for creating metamaterials with extraordinary properties and manipulating waves beyond conventional limitations.",
  "summary": "A new metamaterial design rule shows how simple steady-field patterns can be turned into a method for controlling complex waves The post How do you design an invisibility cloak? appeared first on Physics World .",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}