Darweesh Ahmad A, Bauman Stephen J, Debu Desalegn T, Herzog Joseph B
Microelectronics-Photonics Graduate Program, 731 W. Dickson St., University of Arkansas, Fayetteville, Arkansas, AR 72701, USA.
Department of Physics, College of Science, AL-Nahrain University, Baghdad 64021, Iraq.
Nanomaterials (Basel). 2018 Oct 9;8(10):809. doi: 10.3390/nano8100809.
We propose and report on the design of a 1-D metallo-dielectric nano-grating on a GaAs substrate. We numerically study the impact of grating period, slit and wire widths, and irradiating angle of incidence on the optical response. The optimal wire width, = 160 nm, was chosen based on previous results from investigations into the influence of wire width and nano-slit dimensions on optical and electrical enhancements in metal-semiconductor-metal photodetectors. In this present project, resonant absorption and reflection modes were observed while varying the wire and nano-slit widths to study the unique optical modes generated by Rayleigh-Wood anomalies and surface plasmon polaritons. We observed sharp and diffuse changes in optical response to these anomalies, which may potentially be useful in applications such as photo-sensing and photodetectors. Additionally, we found that varying the slit width produced sharper, more intense anomalies in the optical spectrum than varying the wire width.
我们提出并报告了一种基于砷化镓衬底的一维金属-电介质纳米光栅的设计。我们对光栅周期、狭缝和金属线宽度以及入射角对光学响应的影响进行了数值研究。基于先前对金属线宽度和纳米狭缝尺寸对金属-半导体-金属光探测器光学和电学增强影响的研究结果，选择了最佳金属线宽度，即160纳米。在本项目中，在改变金属线和纳米狭缝宽度时观察到了共振吸收和反射模式，以研究由瑞利-伍德异常和表面等离激元极化激元产生的独特光学模式。我们观察到对这些异常的光学响应有尖锐和弥散的变化，这在诸如光传感和光探测器等应用中可能具有潜在用途。此外，我们发现改变狭缝宽度比改变金属线宽度在光谱中产生更尖锐、更强的异常。
