Sayeed R, Mamun M, Avrutin V, Özgür Ü
Opt Express. 2022 Apr 11;30(8):12204-12214. doi: 10.1364/OE.449628.
The effects of miniaturization on theoretically predicted performance of dual-period guided mode resonance (GMR) transmission filters, which demonstrate immense potential for multispectral imaging in short wave infrared (SWIR), have been compared with experimental findings. With reducing filter size from 112 periods (90 µm) to 12 periods (10 µm), peak transmittance (Tpeak) of simulated and measured filters reduced gradually from 84% to 55% and from 76% to 65%, respectively, with a moderate change of 1 - 3 nm in full width at half maximum (FWHM). For 6 period filters (5 µm), simulations predict drastically reduced Tpeak = 14% accompanied by increase in FWHM by 12 nm. The Tpeak value is theoretically shown to increase to 46% with FWHM reduced by 7 nm upon placing metal reflectors at the optimum positions to increase the optical path length. Our findings indicate that four 5 µm × 5 µm size filters with metal reflectors designed for different resonance wavelengths can be used to form a single, 20 µm × 20 µm mosaic pixel for SWIR multispectral imaging.
已将小型化对双周期导模共振（GMR）透射滤光片理论预测性能的影响与实验结果进行了比较，这种滤光片在短波红外（SWIR）多光谱成像中显示出巨大潜力。随着滤光片尺寸从112个周期（90微米）减小到12个周期（10微米），模拟和实测滤光片的峰值透过率（Tpeak）分别从84%逐渐降低到55%，以及从76%降低到65%，半高宽（FWHM）有1 - 3纳米的适度变化。对于6周期滤光片（5微米），模拟预测Tpeak会急剧降低至14%，同时FWHM增加12纳米。理论表明，在最佳位置放置金属反射器以增加光程长度时，Tpeak值会增加到46%，FWHM减小7纳米。我们的研究结果表明，四个为不同共振波长设计的带有金属反射器的5微米×5微米尺寸滤光片可用于形成一个用于SWIR多光谱成像的20微米×20微米的马赛克像素。
