Zhou N, Wang P, Shi Z X, Gao Y X, Yang Y X, Wang Y P, Xie Y, Cai D W, Guo X, Zhang L, Qiu J R, Tong L M
Opt Express. 2019 Mar 18;27(6):8180-8185. doi: 10.1364/OE.27.008180.
We demonstrate a high-sensitivity relative humidity (RH) sensor taking advantage of single-band narrow plasmon resonance of a single Au nanorod coupled to a whispering gallery cavity mode of a polyacrylamide microfiber. From the resonance peak shift, the sensor could achieve a sensitivity up to 0.51 nm/% RH with a cavity size of about 2 μm. By coupling multiple Au nanorods along the microfiber axis, we demonstrate a position-dependent microfiber optical humidity sensor with a 1.5-mm spatial resolution, which can be potentially reduced to micrometer level, paving a way toward high-resolution distributed microfiber optical sensors.
我们展示了一种高灵敏度相对湿度（RH）传感器，它利用单个金纳米棒的单波段窄等离子体共振与聚丙烯酰胺微纤维的回音壁腔模式相耦合。通过共振峰位移，该传感器在腔尺寸约为2μm时可实现高达0.51nm/%RH的灵敏度。通过沿微纤维轴耦合多个金纳米棒，我们展示了一种具有1.5mm空间分辨率的位置相关微纤维光学湿度传感器，其空间分辨率有可能降低到微米级别，为高分辨率分布式微纤维光学传感器铺平了道路。
