Photonic spin Hall effect in graphene-enabled merged bound states in the continuum

IF 2.5 3区物理与天体物理 Q2 OPTICS

Optics Communications Pub Date : 2025-09-18 DOI:10.1016/j.optcom.2025.132486

Lokesh Ahlawat, Kamal Kishor, Ravindra Kumar Sinha

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引用次数: 0

Abstract

This research paper presents a novel photonic structure design to achieve an ultra-high spin-dependent shift associated with the Photonic Spin Hall Effect (PSHE) possessing high Q-factor. The high quality Q-factor is achieved through the merging of two distinct Bound States in the Continuum (BICs): the Friedrich–Wintgen BIC (FW-BIC) and the symmetry-protected BIC (SP-BIC). Mostly throughout the literature, PSHE shift has been enhanced for H-polarized light with only fewer studies carried out for the enhancement of PSHE shift for V-polarized light. The present structure, comprising periodic silicon steps on a silica substrate with an intercalated graphene layer, exhibits a PSHE shift of 20.83λ upon reflection of V-polarized light at 8.7°. Tuning the unit cell's filling factor generates high Q-factor of 10⁴ through the merging of BICs. Additionally, the influence of graphene's Fermi energy (Ef) on the PSHE shift is analyzed, demonstrating a sensitivity of 0.5 nm/eV. A theoretical framework is provided, showing that the Jones matrix for circularly polarized light aligns with the Pauli spin matrix, offering deeper insight into the spin-optical interaction.

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连续体中石墨烯使能的合并束缚态中的光子自旋霍尔效应

本文提出了一种新的光子结构设计，以实现具有高q因子的光子自旋霍尔效应（PSHE）的超高自旋相关位移。高质量的q因子是通过在连续体（BIC）中合并两个不同的束缚态来实现的：Friedrich-Wintgen BIC （FW-BIC）和对称保护BIC （SP-BIC）。大部分文献中，对h偏振光的PSHE位移进行了增强，而对v偏振光的PSHE位移进行了增强的研究较少。该结构由硅衬底上的周期性硅台阶和嵌入石墨烯层组成，当v偏振光在8.7°处反射时，PSHE位移为20.83λ。调整单元格的填充因子，通过合并bic产生高q因子104。此外，还分析了石墨烯的费米能量（Ef）对PSHE位移的影响，证明其灵敏度为0.5 nm/eV。提供了一个理论框架，表明圆偏振光的琼斯矩阵与泡利自旋矩阵对齐，为自旋光相互作用提供了更深入的了解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.