Topological optical and phononic interface mode by simultaneous band inversion
Topological optical and phononic interface mode by simultaneous band inversion
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DOI：
10.1364/optica.411945
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
O. Ortiz;P. Priya;A. Rodriguez;A. Lemaître;M. Esmann;N. Lanzillotti-Kimura
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文献类型：
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作者：
O. Ortiz;P. Priya;A. Rodriguez;A. Lemaître;M. Esmann;N. Lanzillotti-Kimura
界面模式在电子学、光学、声学和纳米声学等领域得到了广泛的研究。产生它们的一种策略是一维超晶格中的能带反转。迄今为止，这种拓扑状态的大多数实现都是针对单一类型的激发进行探索的。尽管其在相互作用的操纵和工程中的潜力，多个激发的同时拓扑限制的平台仍然是一个开放的挑战。GaAs/AlAs异质结构由于光和声的固有共局域性而表现出增强的光机械相互作用。在这项工作中，我们设计，制造和实验研究了基于GaAs/AlAs的多层结构。由于同时反转的能带结构的光和声子，共域界面模式为1.34 eV的光子和18 GHz的声子出现。我们通过光学反射率和相干声子的产生和检测实验验证了这一概念。此外，我们还从理论上分析了不同拓扑结构的时域布里渊散射共域态的性能，并推导出工程规则。潜在的未来应用包括鲁棒光机械谐振器的工程设计，与诸如量子威尔斯和量子点的有源介质的结合兼容。
Interface modes have been widely explored in the field of electronics, optics, acoustics and nanophononics. One strategy to generate them is band inversion in one-dimensional superlattices. Most realizations of this type of topological states have so far been explored for a single kind of excitation. Despite its potential in the manipulation and engineering of interactions, platforms for the simultaneous topological confinement of multiple excitations remain an open challenge. GaAs/AlAs heterostructures exhibit enhanced optomechanical interactions due to the intrinsic colocalization of light and sound. In this work, we designed, fabricated, and experimentally studied a multilayered structure based on GaAs/AlAs. Due to the simultaneously inverted band structures for light and phonons, colocalized interface modes for both 1.34 eV photons and 18 GHz phonons appear. We experimentally validated the concept by optical reflectivity and coherent phonon generation and detection. Furthermore, we theoretically analyzed the performance of different topological designs presenting colocalized states in time-domain Brillouin scattering and deduce engineering rules. Potential future applications include the engineering of robust optomechanical resonators, compatible with the incorporation of active media such as quantum wells and quantum dots.