边界奇异散射实现无谐振腔的相干完美吸收与激射
Boundary singular scattering enables coherent perfect absorption and lasing without resonators
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中文总结 AI 辅助
本研究提出边界奇异散射概念，证明仅凭非厄米介质界面即可实现相干完美吸收与激射，无需谐振腔，并在实验中通过相位控制实现两者切换。
中文摘要 AI 辅助
散射奇异性通常与谐振散射体相关，对应于散射矩阵的零点和极点，并分别表现为相干完美吸收和激射。在此，我们证明它们可以仅由界面产生，从而无需任何谐振体。我们引入边界奇异散射，即两个非厄米介质之间的界面支持相干完美吸收、激射或两者兼有。尽管存在这些奇异响应，相邻的两种介质均处于宇称-时间（PT）非破缺相，其体态频谱完全为实数。这一现象源于非厄米系统特有的奇异边界模式匹配条件，而非任何潜在的谐振模式。我们在可编程合成光子晶格中进行了实验验证，并通过仅控制入射光束的相对相位，展示了完美吸收与激射之间的相干切换。同一机制可进一步从镜像对称界面推广到具有不同体态色散的非对称界面。我们的工作确立了边界作为散射奇异性此前未被探索的起源，为相干完美吸收、激射及其他奇异波动现象开辟了无谐振腔的途径。
英文摘要
Scattering singularities are features conventionally associated with resonant scattering bodies, which correspond to the zeros and poles of a scattering matrix, and manifest as coherent perfect absorption and lasing respectively. Here, we show that they can emerge solely from an interface, eliminating the need for any resonant body. We introduce boundary singular scattering, whereby an interface between two non-Hermitian media supports coherent perfect absorption, lasing, or both. Despite these singular responses, the two adjoining media are in parity-time (PT)-unbroken phases, with entirely real bulk spectra. This phenomenon originates from a singular boundary mode-matching condition unique to non-Hermitian systems, not from any underlying resonant modes. We demonstrate it experimentally in a programmable synthetic photonic lattice, and show coherent switching between perfect absorption and lasing by controlling only the relative phase of the incident beams. The same mechanism further generalizes from mirror-symmetric interfaces to asymmetric interfaces with dissimilar bulk dispersions. Our work establishes boundaries as a previously unexplored origin of scattering singularities, opening a resonator-free route to coherent perfect absorption, lasing, and other singular wave phenomena.
发表机构
- Nanyang Technological University（南洋理工大学）
- Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area (Guangdong)（粤港澳大湾区量子科学中心（广东））
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