Early studies on Au-NNPs and nanosnowmen involved synthesis using DNA oligomers as interfacial materials. However, particularly for Au-NNPs, observing a clear dark mode in the colloidal solution spectrum was difficult. Specifically, uniformly modulating the dark mode of individual particles was challenging due to non-uniformities in intragap sizes and the number of nanobridges. To overcome this challenge, we developed an optimised DNA nanointerface modulation strategy (see Methods section), which ensures uniform DNA distribution on the surface of nanoparticles, enabling quantitatively controlled resonance of both dark and bright modes within a single nano-Fanowman particle.