High-resolution surface plasmon resonance holographic microscopy based on symmetrical excitation
High-resolution surface plasmon resonance holographic microscopy based on symmetrical excitation
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基于对称激发的高分辨率表面等离子体共振全息显微术
DOI：
10.1016/j.optlaseng.2022.107000
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发表时间：
2022
影响因子：
4.6
通讯作者：
Jiazhen Dou;Chen Dong;Siqing Dai;Jingyu Mi;Xiangyuan Luo;Jianglei Di;Jiwei Zhang;Jianlin Zhao
中科院分区：
文献类型：
--
作者：
Jiazhen Dou;Chen Dong;Siqing Dai;Jingyu Mi;Xiangyuan Luo;Jianglei Di;Jiwei Zhang;Jianlin Zhao
表面等离子体共振全息显微术（SPRHM）能够同时获得振幅和相位对比的表面等离子体共振（SPR）图像，在近场目标高灵敏度成像方面显示出巨大的潜力。然而，由于表面等离子体波的衰减长度可达几十微米，SPRHM的空间分辨率低于传统的全息显微术。在这项工作中，我们提出了提高空间分辨率的SPRHM激发表面等离子体共振在两个对称的方向和对称检测的反射光的复振幅。通过对记录的复合全息图进行傅里叶分析，分别建立了高分辨率振幅衬度和相位衬度SPR图像的再现方案。通过对小尺寸颗粒和微结构的数值模拟和实验验证，验证了该方法的可行性和优越性。
Surface plasmon resonance holographic microscopy (SPRHM) is able to simultaneously obtain the amplitude- and phase-contrast surface plasmon resonance (SPR) images, showing great potentials in imaging near-field targets with high sensitivity. However, suffered by the decaying length of surface plasmon wave which can be as long as tens of microns, the spatial resolution of SPRHM is lower than that of traditional holographic microscopy. In this work, we propose to enhance the spatial resolution in SPRHM by exciting surface plasmon resonance in two symmetrical directions and detecting the complex amplitudes of the reflected light symmetrically. Through the Fourier analysis of the recorded composite hologram, the reconstruction schemes for high-resolution amplitude- and phase-contrast SPR images are established, respectively. The feasibility and advantages of the proposed method is verified by numerical simulations and experimental demonstrations of small-size particles and micro-structures.