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This approach enables morphological analysis of cells with enhanced colorful contrast based on refractive index differences between the cells and their surrounding medium. Unlike conventional methods that rely on molecular dyes and regularly patterned plasmonic structures, our technique employs electrostatic nanoparticle assembly to rapidly create oligomeric plasmonic arrays across an entire wafer. These oligomers provide far\u2010reaching optical near\u2010field enhancement, exceeding 30\u00a0nm, approximately 10 times greater than that provided by monomeric nanoparticles, allowing for the visualization of cellular components located above the cellular membrane. 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