光子晶体平板的完整光致发光偏振调色板
A complete photoluminescence polarization palette from a photonic-crystal slab
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中文总结 AI 辅助
该研究在单个非手性光子晶体平板中实现完整光致发光偏振调色板，利用模式对称性相互作用调控偏振，还产生偏振涡旋，确立其为对称可编程偏振的单片光源。
中文摘要 AI 辅助
具有定制偏振的集成光源对集成光子学、光通信、传感和结构光应用至关重要。然而，从自发辐射产生广泛的偏振态通常依赖于具有破缺镜面、旋转或反演对称性的结构，或具有预设偏振特性的发射体。在此，我们在单个非手性光子晶体平板中展示了完整的光致发光偏振调色板，该平板具有六边形孔晶格和嵌入的自组装Ge(Si)纳米岛。我们表明，发射光的偏振由不同对称性模式之间的相互作用决定，而非非偏振发射体的特性。在布里渊区的高对称方向上，对称性强制产生纯线性发射，并实现基于偏振的光子晶体模式直接分类。远离这些方向时，所有斯托克斯参数均非零，提供光致发光的全斯托克斯控制和高度偏振发射。我们进一步展示了与对称性保护和连续谱中的Friedrich-Wintgen束缚态相关的偏振涡旋，以及与连续谱中的束缚态无关的辐射偏振奇点。通过适当的几何优化，同一平台可支持具有完整偏振调色板的光致发光以及偏振涡旋。我们的结果确立了非手性光子晶体平板作为对称可编程光致发光偏振的单片光源。
英文摘要
Integrated light sources with tailored polarization are essential for integrated photonics, optical communication, sensing, and structured-light applications. However, generating a broad set of polarization states from spontaneous emission usually relies on structures with broken mirror, rotational, or inversion symmetries, or on emitters with predefined polarization properties. Here, we demonstrate a complete photoluminescence polarization palette in a single achiral photonic-crystal slab with a hexagonal lattice of holes and embedded self-assembled Ge(Si) nanoislands. We show that the polarization of the emitted light is governed by the interplay among modes with different symmetries rather than by the properties of unpolarized emitters. Along the high-symmetry directions of the Brillouin zone, symmetry enforces purely linear emission and enables direct polarization-based classification of the photonic-crystal modes. Away from these directions, all Stokes parameters become non-zero, providing full-Stokes control of photoluminescence and highly polarized emission. We further demonstrate polarization vortices associated with symmetry-protected and Friedrich-Wintgen bound states in the continuum, as well as radiating polarization singularities not associated with bound states in the continuum. Through appropriate geometric optimization, the same platform supports photoluminescence with a full polarization palette as well as polarization vortices. Our results establish achiral photonic-crystal slabs as monolithic sources of symmetry-programmable photoluminescence polarization.
