Lu Jun, Jung Hong Ju, Kim Ji-Young, Kotov Nicholas A
Center for Complex Particle Systems (COMPASS), University of Michigan, Ann Arbor, MI, USA.
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI, USA.
Science. 2024 Dec 20;386(6728):1400-1404. doi: 10.1126/science.adq4068. Epub 2024 Dec 19.
Planck's law ignores but does not prohibit black-body radiation (BBR) from being circularly polarized. BBR from nanostructured filaments with twisted geometry from nanocarbon or metal has strong ellipticity from 500 to 3000 nanometers. The submicrometer-scale chirality of these filaments satisfies the dimensionality requirements imposed by fluctuation-dissipation theorem and requires symmetry breaking in absorptivity and emissivity according to Kirchhoff's law. The resulting BBR shows emission anisotropy and brightness exceeding those of conventional chiral photon emitters by factors of 10 to 100. The helical structure of these filaments enables precise spectral tuning of the chiral emission, which can be modeled using electromagnetic principles and chirality metrics. Encapsulating nanocarbon filaments in refractive ceramics produces highly efficient, adjustable, and durable chiral emitters capable of functioning at extreme temperatures previously considered unattainable.
普朗克定律忽略了但并未禁止黑体辐射（BBR）呈圆偏振态。来自具有纳米碳或金属扭曲几何结构的纳米结构细丝的BBR在500至3000纳米范围内具有很强的椭圆率。这些细丝的亚微米级手性满足涨落耗散定理所施加的维度要求，并根据基尔霍夫定律要求在吸收率和发射率上打破对称性。由此产生的BBR显示出发射各向异性，其亮度比传统手性光子发射器高出10到100倍。这些细丝的螺旋结构能够对手性发射进行精确的光谱调谐，这可以使用电磁原理和手性度量来建模。将纳米碳细丝封装在折射陶瓷中可产生高效、可调节且耐用的手性发射器，能够在以前认为无法达到的极端温度下工作。
