Polarization-sensitive switchable display through critical coupling between graphene and a quasi-BIC,Physical Chemistry Chemical Physics

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Polarization-sensitive switchable display through critical coupling between graphene and a quasi-BIC
Physical Chemistry Chemical Physics ( IF 2.9 ) Pub Date : 2022-11-16 , DOI: 10.1039/d2cp05172a
Zonglin Li _{1,

2} , Guozheng Nie _{1,

2,

3} , Zhiquan Chen ₃ , Deqiong Li ₄ , Diwen Tan _{1,

2} , Hui Xu ₃ , Yunxin Liu _{1,

2,

3}

Affiliation

Enhanced light–matter interaction of a local field is of prime importance in optics as it can improve the performance of nanophotonic devices. Such enhancement can be achieved by utilizing the optical bound states in the continuum (BICs). In this study, a dielectric metasurface is proposed that could enhance the light–matter interactions in graphene. A symmetry-protected BIC was observed in such a metasurface, which could transform into a quasi-BIC with a high quality (Q-) factor when the in-plane symmetry is broken. As the graphene monolayer was introduced into the system, its absorption was enhanced by the quasi-BIC resonance. By optimizing the graphene Fermi energy and the asymmetry parameter of the metasurface to satisfy the critical-coupling condition, a tunable absorber could be achieved. The absorbing intensity could be efficiently modulated by varying the polarization direction of the incident light, the maximum difference of which was up to 95.4%. Also, further investigation showed that such a feature indicates potential application in digital switches and image displays, which could be switched by incident polarization only, and therefore without dependence on an additional structural change.

中文翻译：

通过石墨烯和准 BIC 之间的临界耦合偏振敏感可切换显示器

增强局部场的光-物质相互作用在光学中至关重要，因为它可以提高纳米光子器件的性能。这种增强可以通过利用连续体 (BIC) 中的光学束缚态来实现。在这项研究中，提出了一种介电超表面，可以增强石墨烯中的光-物质相互作用。在这样的超曲面中观察到对称保护的 BIC，它可以转化为高质量的准 BIC（Q-) 面内对称性破缺时的系数。当石墨烯单层被引入系统时，准 BIC 共振增强了它的吸收。通过优化石墨烯费米能量和超表面的不对称参数以满足临界耦合条件，可以实现可调吸收体。通过改变入射光的偏振方向可以有效地调制吸收强度，最大差异可达95.4%。此外，进一步的研究表明，这种特性表明在数字开关和图像显示器中具有潜在的应用，它们可以仅通过入射偏振进行切换，因此不依赖于额外的结构变化。

更新日期：2022-11-16

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