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arXiv 2108.09672physics.opticsquant-ph
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非厄米纳米腔阵列中零模的直接观测

Direct observation of zero modes in a non-Hermitian nanocavity array

Flore Hentinger, Melissa Hedir, Bruno Garbin, Mathias Marconi, Li Ge, Fabrice Raineri, Ariel Levenson, Alejandro M. Yacomotti

摘要:

零模是能量本征值实部为零的对称保护模。在厄米阵列中,它们是亚晶格对称的结果,这意味着它们是暗模。在增益/损耗光学腔中自然出现的非厄米系统中,粒子-空穴对称性占主导地位;所产生的零模不再是暗的,而是具有相邻腔之间的$π/2$相位跳变。在这里,我们报告的零模式的非厄米三耦合光子晶体纳米腔阵列包含量子阱的直接观察。与厄米对应物不同,非厄米零模式只能在小的子晶格失谐下观察到,并且它们可以通过在选定的泵浦位置处的光致发光的远场成像和光谱滤波来识别。我们解释了零模合并作为一个宇称时间相变小耦合。这些零模对耦合无序具有鲁棒性,可用于激光模式工程和光子计算。

英文摘要:

Zero modes are symmetry protected ones whose energy eigenvalues have zero real parts. In Hermitian arrays, they arise as a consequence of the sublattice symmetry, implying that they are dark modes. In non-Hermitian systems, that naturally emerge in gain/loss optical cavities, particle-hole symmetry prevails instead; the resulting zero modes are no longer dark but feature $π/2$ phase jumps between adjacent cavities. Here we report on the direct observation of zero modes in a non-Hermitian three coupled photonic crystal nanocavity array containing quantum wells. Unlike the Hermitian counterparts, the non-Hermitian zero modes can only be observed for small sublattice detuning, and they can be identified through far-field imaging and spectral filtering of the photoluminescence at selected pump locations. We explain the zero mode coalescence as a parity-time phase transition for small coupling. These zero modes are robust against coupling disorder, and can be used for laser mode engineering and photonic computing.

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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