1] European Laboratory for Non-linear Spectroscopy, Via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy [2] Department of Physics, University of Florence, Via G. Sansone 1, 50019 Sesto Fiorentino (FI), Italy [3].
1] European Laboratory for Non-linear Spectroscopy, Via N. Carrara 1, 50019 Sesto Fiorentino (FI), Italy [2] Department of Physics, University of Florence, Via G. Sansone 1, 50019 Sesto Fiorentino (FI), Italy.
Nat Mater. 2014 Jul;13(7):720-5. doi: 10.1038/nmat3966. Epub 2014 May 18.
Disordered photonic materials can diffuse and localize light through random multiple scattering, offering opportunities to study mesoscopic phenomena, control light-matter interactions, and provide new strategies for photonic applications. Light transport in such media is governed by photonic modes characterized by resonances with finite spectral width and spatial extent. Considerable steps have been made recently towards control over the transport using wavefront shaping techniques. The selective engineering of individual modes, however, has been addressed only theoretically. Here, we experimentally demonstrate the possibility to engineer the confinement and the mutual interaction of modes in a two-dimensional disordered photonic structure. The strong light confinement is achieved at the fabrication stage by an optimization of the structure, and an accurate and local tuning of the mode resonance frequencies is achieved via post-fabrication processes. To show the versatility of our technique, we selectively control the detuning between overlapping localized modes and observe both frequency crossing and anti-crossing behaviours, thereby paving the way for the creation of open transmission channels in strongly scattering media.
无序光子材料可以通过随机多次散射来扩散和局域化光，为研究介观现象、控制光物质相互作用以及为光子应用提供新策略提供了机会。这种介质中的光传输由具有有限光谱宽度和空间范围的共振特征的光子模式控制。最近，人们在使用波前整形技术控制传输方面取得了相当大的进展。然而，对单个模式的选择性工程仅在理论上得到了研究。在这里，我们通过实验证明了在二维无序光子结构中对模式的限制和相互作用进行工程设计的可能性。通过结构优化，在制造阶段实现了强光限制，并且通过制造后工艺实现了模式共振频率的精确和局部调谐。为了展示我们技术的多功能性，我们选择性地控制重叠局域模式之间的失谐，并观察到频率交叉和反交叉行为，从而为在强散射介质中创建开放传输通道铺平了道路。
