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arXiv 2211.02808physics.optics
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光局域化基本极限的观测

Observation of Fundamental Limit of Light Localization

Farbod Shafiei, Massoud R. Masir, Tommaso Orzali, Alexey Vert, Man Hoi Wong, Gennadi Bersuker, Michael C. Downer

摘要:

在无序介质中,光可以局限于平均为光学平均自由程(MFP)的散射位点之间的空间中。然而,由于具有受控纳米级间隙的散射介质的制造复杂性以及远场方法缺乏所需的分辨率,因此可以支持光的安德森局域化的最小MFP的基本问题仍然没有答案。在这里,我们使用扫描探针显微镜技术,收集本地化的光散射晶体缺陷之间的间隙中创建的各种各样的纳米间隙III-V族介质。在390 nm处的二次谐波收集下,没有观察到与MFP相关的低于约14.5 nm的局部斑点。实验和模拟导致第一次直接观察到与~13 nm光学MFP相关的安德森光局部化的抑制,这揭示了电磁学和光子学中的基本约束。

英文摘要:

In disordered media light can be localized in the spaces between scattering sites which average to an optical mean free path (MFP). However the fundamental question of the smallest MFP that can support Anderson localization of light remains unanswered due to fabrication complexity of a scattering medium with controlled nano-scale gaps and lack of required resolution by far-field methods. Here we use scanning probe microscopy technique to collect localized light created at gaps between scattering crystallographic defects in a large variety set of nano-gap III-V medium. No localized spots correlated to MFP below ~14.5 nm is observed at second-harmonic collection at 390 nm. Experiment and simulation resulted in the first direct observation of suppression of Anderson light localization correlated to ~13 nm optical MFP that reveals a fundamental constraint in electromagnetism and photonics.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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