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Electronic Detection of Photonic Band Gaps in Nanolithographic Metallic Gratings
IEEE Journal of Quantum Electronics ( IF 2.5 ) Pub Date : 2020-08-01 , DOI: 10.1109/jqe.2020.2992761
William T. Rieger , Yuhong Kang , Jean J. Heremans , Hang Ruan

In nanolithographic metallic gratings we investigate the dependence of photonic band gaps on geometrical parameters. Finite element modeling was used to develop a model for an optoelectronic device with periodicity of 470 nm and concomitantly the electronic response of a nanofabricated metal-semiconductor-metal photodetector grating was experimentally studied under a sweeping monochromatic light source. The grating spectral response increased in the region between 470 nm and 520 nm, corroborating the computational results. This increase is understood to occur because photons with wavelength shorter than approximately 520 nm are energetic enough to excite interband transitions in the Au, but the period of the structure acts as a cutoff where incident photons with wavelength shorter than the period are less likely to form surface plasmon polaritons. This cutoff originates from a photonic band gap. Magnetic field intensity profiles at the 3 dB cutoff indicate that a surface plasmon wave exists where each finger interacts with the next through overlapping magnetic fields, suggesting that the cutoff is a surface plasmon wave effect. Localized surface plasmon effects were observed at longer wavelengths in the modeled absorbance. The effects of three geometrical parameters on the spectral dependence of modeled absorbance were investigated.

中文翻译:

纳米光刻金属光栅中光子带隙的电子检测

在纳米光刻金属光栅中,我们研究了光子带隙对几何参数的依赖性。有限元建模用于开发周期性为 470 nm 的光电器件模型,同时在扫描单色光源下对纳米制造的金属-半导体-金属光电探测器光栅的电子响应进行了实验研究。光栅光谱响应在 470 nm 和 520 nm 之间的区域内增加,证实了计算结果。这种增加被认为是因为波长短于大约 520 nm 的光子的能量足以激发 Au 中的带间跃迁,但结构的周期充当截止,波长短于周期的入射光子不太可能形成表面等离子体激元。该截止来自光子带隙。3 dB 截止处的磁场强度分布表明存在表面等离子体波,其中每个手指通过重叠磁场与下一个相互作用,这表明截止是表面等离子体波效应。在模拟吸光度的较长波长处观察到局部表面等离子体效应。研究了三个几何参数对建模吸光度的光谱依赖性的影响。在模拟吸光度的较长波长处观察到局部表面等离子体效应。研究了三个几何参数对建模吸光度的光谱依赖性的影响。在模拟吸光度的较长波长处观察到局部表面等离子体效应。研究了三个几何参数对建模吸光度的光谱依赖性的影响。
更新日期:2020-08-01
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