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yexuqing木虫之王 (文学泰斗)
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Electrically driven chiral emission from plasmonic tunnel junctions
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Electrically driven chiral emission from plasmonic tunnel junctions 等离激元隧道结的电驱动手性发射 ▲ 作者：Yuanyang Xie, Alexey V. Krasavin, and Anatoly V. Zayats ▲链接： https://www.science.org/doi/10.1126/science.aeh4015 ▲摘要： 手性在物理、化学和生物学的广泛过程中，包括光—物质相互作用中发挥着关键作用，而量子隧穿为纳米尺度光产生提供了一种有前景的机制。通过将隧道结与手性等离激元纳米螺旋体集成，研究者实现了单粒子水平上的电诱导纳米级手性光产生。 隧穿驱动的手性偶极模式共振激发导致发射出涡旋光束，该光束同时具有手性选择度超过0.8的自旋角动量和大小相等、符号相反轨道角动量。研究者的电驱动方法为纳米尺度光子自旋产生工程化提供了一种手段，凸显了其在显示应用、量子信息处理和光化学中作为下一代光学组件的潜力。 ▲ Abstract： Chirality plays a crucial role in a broad range of processes, including light-matter interactions in physics, chemistry, and biology, while quantum tunneling provides a promising mechanism for light generation at the nanoscale. By integrating tunnel junctions with chiral plasmonic nanohelicoids, we achieved electrically induced nanoscale generation of chiral light at the single-particle level. The tunneling-driven resonant excitation of chiral dipolar modes of the nanohelicoids results in emission of a vortex light beam possessing both spin angular momentum with handedness selectivity of more than 0.8 and orbital angular momentum equal in magnitude and opposite in sign. Our electrically driven approach offers a means for engineering photon spin generation at the nanoscale, highlighting its potential for next-generation optical components in display applications, as well as quantum information processing and photochemistry. |
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