Zhang Jiwei, Dai Siqing, Ma Chaojie, Di Jianglei, Zhao Jianlin
Opt Lett. 2017 Sep 1;42(17):3462-3465. doi: 10.1364/OL.42.003462.
We develop a compact objective-coupling surface plasmon holographic microscopy with a common-path configuration by introducing a Wollaston prism. Through off-axis hologram recording and numerical reconstruction, amplitude- and phase-contrast surface plasmon resonance (SPR) images can be obtained simultaneously. Based on the four-layer SPR model, the thin film thickness distribution in near field can be mapped unambiguously using a novel demodulation method without a priori knowledge. The technique demonstrates nondestructive and full-field measurement capabilities with sub-nanometer resolution theoretically. Furthermore, owing to the high temporal stability, the recommended system shows great potential for dynamic measurement of near-field tiny refractive index or thickness variation in fields such as chemistry and biomedicine, etc.
我们通过引入沃拉斯顿棱镜，开发了一种具有共光路配置的紧凑型物镜耦合表面等离子体全息显微镜。通过离轴全息图记录和数值重建，可以同时获得振幅和相位对比表面等离子体共振（SPR）图像。基于四层SPR模型，使用一种无需先验知识的新型解调方法，可以明确地绘制近场中的薄膜厚度分布。该技术理论上具有亚纳米分辨率的无损和全场测量能力。此外，由于高时间稳定性，所推荐的系统在化学和生物医学等领域的近场微小折射率或厚度变化的动态测量方面显示出巨大潜力。
