Granular Permittivity Representation in Extremely Near-Field Light–Matter Interaction Processes,ACS Photonics

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Granular Permittivity Representation in Extremely Near-Field Light–Matter Interaction Processes
ACS Photonics ( IF 6.5 ) Pub Date : 2017-09-05 00:00:00 , DOI: 10.1021/acsphotonics.7b00605
Alexey S. Kadochkin _{1,

2} , Alexander S. Shalin ₂ , Pavel Ginzburg _{2,

3}

Affiliation

Light–matter interactions are significantly affected by surrounding electromagnetic material bodies, which are usually introduced into a model via their classical constitutive relations. While this approach is applicable in many cases, it faces limitations when emitters are situated very close to material boundaries and nonlocal quantum wave functions become comparable in size with distances to boundaries and materials’ lattice constants. Here a semiclassical model taking into account a material’s granularity is developed, and spontaneous emission processes next to flat boundaries are analyzed. The material is divided into a pair of areas: the far zone is modeled as a continuous phase, while the near zone next to a nonlocal emitter is represented with a discrete array of polarizable particles. Local field effects were shown to provide orders of magnitude corrections to spontaneous emission rates in the case of sub-nanometer emitter–surface distances. The developed mesoscopic model addresses aspects of local field corrections in scenarios where quantum ab initio techniques face challenges.

中文翻译：

极近场光-质相互作用过程中的颗粒介电常数表示

周围电磁材料物体会显着影响光与物质的相互作用，通常通过它们的经典本构关系将其引入模型中。尽管这种方法在许多情况下都适用，但是当发射极位于非常靠近材料边界的位置并且非局部量子波函数的大小与边界的距离和材料的晶格常数相当时，它将面临局限性。在这里，开发了一个考虑到材料粒度的半经典模型，并分析了靠近平坦边界的自发发射过程。该材料分为一对区域：将远区建模为连续相，而将非局部发射器旁边的近区用可极化粒子的离散阵列表示。研究表明，在亚纳米发射器-表面距离的情况下，局部场效应可对自发发射率提供数量级的校正。开发的介观模型解决了量子场中局部场校正的各个方面从头算技术面临挑战。

更新日期：2017-09-05

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