中红外手性与通过扭转实现的手性热发射
Mid-IR chirality and chiral thermal emission through twisting
AI总结：
该研究利用范德华晶体的天然光学各向异性，通过实验证实α-MoO₃扭转双层结构具有本征手性，可通过白炽发光产生中红外手性光，无需光刻，为大规模手性滤光片和热源提供新平台。
摘要：
中红外光谱范围内的手性在物理、化学和生物科学中发挥着关键作用，但目前尚不存在手性红外光源。利用成熟的超材料领域原理来开发这类光源，需要复杂的三维结构，而这依赖于高分辨率光刻技术。我们利用若干范德华晶体（例如α-MoO₃）中存在的天然光学各向异性，通过实验证明其扭转双层结构打破了反转旋转对称性，因而具有本征手性。通过对微观扭转双层结构进行直接热发射测量，我们证明这些异质结构可通过白炽发光产生手性光。范德华材料的扭转构型无需任何光刻工艺，为超越传统超构架构的大规模手性滤光片和热源提供了平台。
英文摘要：
Chirality in the mid-infrared spectral range plays a crucial role across physical, chemical, and biological sciences, yet sources of chiral infrared light do not currently exist. Their development, using principles from the mature field of metamaterials, requires complex three-dimensional architectures that call for high-resolution lithography. We leverage the natural optical anisotropy found in several van der Waals crystals, for example $α$-MoO$_3$, to demonstrate experimentally that its twisted bilayers break inversion-rotation symmetry and are thereby intrinsically chiral. Via direct thermal emission measurements of microscopic twisted bilayers, we demonstrate that these heterostructures generate chiral light through incandescence. Twisted configurations of van der Waals materials do not require any lithography, and offer a platform for large-scale chiral filters and thermal sources beyond conventional meta-architectures.
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