A metasurface for linear-to-circular polarization conversion and sensing based on quasi-BIC

IF 2.9 3区物理与天体物理 Q3 NANOSCIENCE & NANOTECHNOLOGY

Physica E-low-dimensional Systems & Nanostructures Pub Date : 2024-10-10 DOI:10.1016/j.physe.2024.116128

Fa-Zhan Liu, Si-Yuan Liao, Qi-Juan Li, Jing-Wei Huang, Hai-Feng Zhang

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Abstract

This work presents a multifunctional metastructure (MS) which realizes linear to circular polarization conversion and sensing function based on quasi-bound states in the continuum (quasi-BIC). MS is made of silicon dioxide as substrate, and silicon as surface material, by etching cross holes and square holes on it to form a 2×2 structure, through the transmission of terahertz (THz) band, to form an ultrahigh quality factor (Q-factor), and realize the conversion of linearly polarized waves to circularly polarized ones. At 178.190 THz, it achieves a Q value of 2969, and in the range 178.193 TH to 178.200 THz, the axial ratio (AR) is less than 3 dB and the insertion loss is less than 0.0001. In addition, by changing the permittivity of the surrounding environment, the minimum of the output wave will produce a good linear frequency shift. Using this feature, the given device can also be used as a dielectric constant sensor to detect air quality. The device has a sensing sensitivity (S) of 6.415 THz RIU⁻¹ and a figure of merit (FOM) of 106.9. The parameters (H, w₂, L₂, g₂), incidence angle (θ) and the polarization angle (φ) are discussed. The effects of different parameters on the Q-factor and AR were analyzed, which helped to select the optimal parameters. The design can also be used in communication and biosensing.

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基于准 BIC 的线-圆偏振转换和传感元表面

本研究提出了一种多功能元结构（MS），它基于连续体中的准束缚态（quasi-BIC）实现了线性极化到圆形极化的转换和传感功能。MS 以二氧化硅为衬底，硅为表面材料，通过蚀刻十字孔和方孔形成 2×2 结构，通过太赫兹（THz）波段的传输，形成超高品质因数（Q 因子），实现线偏振波到圆偏振波的转换。在 178.190 THz 时，它的 Q 值达到 2969，在 178.193 TH 至 178.200 THz 范围内，轴向比 (AR) 小于 3 dB，插入损耗小于 0.0001。此外，通过改变周围环境的介电常数，输出波的最小值将产生良好的线性频移。利用这一特点，该装置还可用作介电常数传感器来检测空气质量。该装置的传感灵敏度（S）为 6.415 THz RIU-1，优点系数（FOM）为 106.9。对参数（H、w2、L2、g2）、入射角（θ）和偏振角（φ）进行了讨论。分析了不同参数对 Q 因子和 AR 的影响，有助于选择最佳参数。该设计还可用于通信和生物传感。

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

Physica E-low-dimensional Systems & Nanostructures 物理-纳米科技

CiteScore

7.30

自引率

6.10%

发文量

356

审稿时长

65 days

期刊介绍： Physica E: Low-dimensional systems and nanostructures contains papers and invited review articles on the fundamental and applied aspects of physics in low-dimensional electron systems, in semiconductor heterostructures, oxide interfaces, quantum wells and superlattices, quantum wires and dots, novel quantum states of matter such as topological insulators, and Weyl semimetals. Both theoretical and experimental contributions are invited. Topics suitable for publication in this journal include spin related phenomena, optical and transport properties, many-body effects, integer and fractional quantum Hall effects, quantum spin Hall effect, single electron effects and devices, Majorana fermions, and other novel phenomena. Keywords: • topological insulators/superconductors, majorana fermions, Wyel semimetals; • quantum and neuromorphic computing/quantum information physics and devices based on low dimensional systems; • layered superconductivity, low dimensional systems with superconducting proximity effect; • 2D materials such as transition metal dichalcogenides; • oxide heterostructures including ZnO, SrTiO3 etc; • carbon nanostructures (graphene, carbon nanotubes, diamond NV center, etc.) • quantum wells and superlattices; • quantum Hall effect, quantum spin Hall effect, quantum anomalous Hall effect; • optical- and phonons-related phenomena; • magnetic-semiconductor structures; • charge/spin-, magnon-, skyrmion-, Cooper pair- and majorana fermion- transport and tunneling; • ultra-fast nonlinear optical phenomena; • novel devices and applications (such as high performance sensor, solar cell, etc); • novel growth and fabrication techniques for nanostructures