Highly sensitive refractive index, chemical potential, and applied electrical voltage detection in terahertz region with photonic spin Hall effect in a plasmonic sensor based on graphene and germanium layers

IF 2.1 4区 物理与天体物理 Q2 PHYSICS, MULTIDISCIPLINARY Romanian Reports in Physics Pub Date : 2023-09-15 DOI:10.59277/romrepphys.2023.75.407
V. A. POPESCU
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Abstract

"In this work, a transverse spin-dependent shift (SDS) of the horizontal photonic spin Hall effect (PSHE) at a fixed frequency (5 THz) is simulated for detection of refractive index, chemical potential, and applied electrical voltage to a plasmonic sensor with four layers (germanium, organic layer, graphene, and gas medium). The variation of the refractive index of graphene with chemical potential and applied voltage is given from the simulated values. A refractive index resolution (1.73 × 10–12 RIU) is obtained when the refractive index n4 of the analyte layer is changed from 1 RIU to 1.1 RIU when the chemical potential μc is 0.003 eV and the amplified angle ∆ is 0.1°. A chemical potential resolution (6.32 × 10–14 eV) and corresponding voltage resolution (6.83 × 10–13 V) are obtained when the chemical potential is changed from 0.003 eV to 0.03 eV, the refractive index of gas medium n4 is 1.1 RIU and the amplified angle is ∆ = 0.1°. These values are very good in comparison with the situation when the spin Hall effect is not applied (7.47 × 10–6 RIU, 0.001166 eV, and 0.01259 V) for the same values of μc, n4, and ∆."
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基于石墨烯和锗层的等离子体传感器中光子自旋霍尔效应的高灵敏度折射率、化学势和太赫兹区应用电压检测
“在这项工作中,模拟了固定频率(5太赫兹)下水平光子自旋霍尔效应(PSHE)的横向自旋相关位移(SDS),用于检测折射率、化学势和四层等离子体传感器(锗、有机层、石墨烯和气体介质)的施加电压。根据模拟结果,给出了石墨烯折射率随化学势和外加电压的变化规律。当化学势μc为0.003 eV,放大角∆为0.1°时,分析物层的折射率n4由1 RIU变为1.1 RIU,折射率分辨率为1.73 × 10-12 RIU。当化学势从0.003 eV变为0.03 eV,气体介质n4的折射率为1.1 RIU,放大角度为∆= 0.1°时,得到化学势分辨率为6.32 × 10-14 eV,对应电压分辨率为6.83 × 10-13 V。对于相同的μc、n4和∆,这些值与不施加自旋霍尔效应时(7.47 × 10-6 RIU, 0.001166 eV和0.01259 V)的情况相比是非常好的。
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来源期刊
Romanian Reports in Physics
Romanian Reports in Physics 物理-物理:综合
CiteScore
4.20
自引率
29.60%
发文量
0
审稿时长
4-8 weeks
期刊介绍: Romanian Reports in Physics is a journal publishing physics contributions in the fields of: 1. Mathematical and General Physics 2. Nuclear Physics. Particle Physics. Astroparticle Physics 3. Atomic and Molecular Physics 4. Plasma Physics 5. Condensed Matter 6. Optics & Quantum Electronics 7. Biophysics & Medical Physics. Environmental Physics 8. Physical Methods and Instrumentation 9. Earth Physics
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