Compact surface plasmon holographic microscopy for near-field film mapping

作者：Zhang, Jiwei; Dai, Siqing; Ma, Chaojie; Di, Jianglei; Zhao, Jianlin^*

来源：Optics Letters, 2017, 42(17): 3462-3465.

DOI：10.1364/OL.42.003462

• TOTAL INTERNAL-REFLECTION
• REFRACTIVE-INDEX DISTRIBUTION
• DIGITAL HOLOGRAPHY
• RESONANCE
• INTERFEROMETRY
• TRANSMISSION
• SYSTEM

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.

• 出版日期2017-9-1
• 单位西北工业大学