Energy transport in diffusive waveguides

IF 17.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Kevin J. Mitchell, Vytautas Gradauskas, Jack Radford, Ilya Starshynov, Samuel Nerenberg, Ewan M. Wright, Daniele Faccio
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Abstract

The guiding and transport of energy, for example, of electromagnetic waves, underpins many modern technologies, ranging from long-distance optical fibre telecommunications to on-chip optical processors. Traditionally, a mechanism is required that exponentially localizes the waves or particles in the confinement region, such as total internal reflection at a boundary. Here we introduce a waveguiding mechanism that relies on a different origin for the exponential confinement and that arises owing to the physics of diffusion. We demonstrate this concept using light and show that the photon density can propagate as a guided mode along a core structure embedded in a scattering opaque material, enhancing light transmission by orders of magnitude and along non-trivial, such as curved, trajectories. This waveguiding mechanism can also occur naturally, for example, in the cerebrospinal fluid surrounding the brain and along tendons in the human body, and is to be expected in other systems that follow the same physics such as neutron diffusion. Waveguides—often based on total internal reflection—underpin many photonic technologies, including fibre networks for broadband communications. Now a different type of waveguide based on physical diffusion in a scattering medium is demonstrated.

Abstract Image

Abstract Image

扩散波导中的能量传输
能量的引导和传输,例如电磁波的引导和传输,是许多现代技术的基础,从长距离光纤通信到片上光学处理器,不一而足。传统上,需要一种机制将波或粒子以指数方式定位在约束区域,例如边界处的全内反射。在这里,我们引入了一种波导机制,它依赖于指数约束的不同起源,并且是由于扩散物理学而产生的。我们用光演示了这一概念,并表明光子密度可以作为导波模式沿着嵌入散射不透明材料中的核心结构传播,从而以数量级增强光传输,并沿着非三维(如弯曲)轨迹传播。这种波导机制也可以自然发生,例如在大脑周围的脑脊液中和沿着人体的肌腱传播,而且在其他遵循相同物理学原理(如中子扩散)的系统中也会发生。
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来源期刊
Nature Physics
Nature Physics 物理-物理:综合
CiteScore
30.40
自引率
2.00%
发文量
349
审稿时长
4-8 weeks
期刊介绍: Nature Physics is dedicated to publishing top-tier original research in physics with a fair and rigorous review process. It provides high visibility and access to a broad readership, maintaining high standards in copy editing and production, ensuring rapid publication, and maintaining independence from academic societies and other vested interests. The journal presents two main research paper formats: Letters and Articles. Alongside primary research, Nature Physics serves as a central source for valuable information within the physics community through Review Articles, News & Views, Research Highlights covering crucial developments across the physics literature, Commentaries, Book Reviews, and Correspondence.
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