时空光涡旋中轨道角动量的量子理论

IF 2.8 2区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY
Pronoy Das, Sathwik Bharadwaj and Zubin Jacob
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引用次数: 0

摘要

时空光学漩涡(STOV)是在自由空间中传播的结构化电磁场,在时空域中具有相位奇异性。根据螺旋相位前沿的倾斜度,STOV 可携带纵向和横向轨道角动量(OAM)。尽管近年来 STOVs 引起了人们的极大兴趣,但目前的理解仅限于半经典图景。在这里,我们为具有任意倾斜度的 STOV 建立了量子理论,并超越了准轴向极限。我们证明,量子 STOV 状态(如福克脉冲和相干扭曲光子脉冲)显示出传统单色扭曲脉冲所没有的非渐变纵向 OAM 波动。我们的研究表明,这些量子波动呈现出独特的纹理,即空间分布,可用于实验隔离这些量子效应。我们的研究成果标志着利用结构光的量子效应实现各种应用迈出了一步,如基于 OAM 的编码协议和平台,以探索二维材料系统中新型的光物质相互作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Quantum theory of orbital angular momentum in spatiotemporal optical vortices
Spatiotemporal Optical Vortices (STOVs) are structured electromagnetic fields propagating in free space with phase singularities in the space-time domain. Depending on the tilt of the helical phase front, STOVs can carry both longitudinal and transverse orbital angular momentum (OAM). Although STOVs have gained significant interest in the recent years, the current understanding is limited to the semi-classical picture. Here, we develop a quantum theory for STOVs with an arbitrary tilt, extending beyond the paraxial limit. We demonstrate that quantum STOV states, such as Fock and coherent twisted photon pulses, display non-vanishing longitudinal OAM fluctuations that are absent in conventional monochromatic twisted pulses. We show that these quantum fluctuations exhibit a unique texture, i.e. a spatial distribution which can be used to experimentally isolate these quantum effects. Our findings represent a step towards the exploitation of quantum effects of structured light for various applications such as OAM-based encoding protocols and platforms to explore novel light–matter interaction in 2D material systems.
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来源期刊
New Journal of Physics
New Journal of Physics 物理-物理:综合
CiteScore
6.20
自引率
3.00%
发文量
504
审稿时长
3.1 months
期刊介绍: New Journal of Physics publishes across the whole of physics, encompassing pure, applied, theoretical and experimental research, as well as interdisciplinary topics where physics forms the central theme. All content is permanently free to read and the journal is funded by an article publication charge.
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