3 years ago

Bioplasmonic Alloyed Nanoislands Using Dewetting of Bilayer Thin Films

Bioplasmonic Alloyed Nanoislands Using Dewetting of Bilayer Thin Films
Minhee Kang, Ki-Hun Jeong, Youngseop Lee, Myeong-Su Ahn
Unlike monometallic materials, bimetallic plasmonic materials offer extensive benefits such as broadband tuning capability or high environmental stability. Here we report a broad range tuning of plasmon resonance of alloyed nanoislands by using solid-state dewetting of gold and silver bilayer thin films. Thermal dewetting after successive thermal evaporation of thin metal double-layer films readily forms AuAg-alloyed nanoislands with a precise composition ratio. The complete miscibility of alloyed nanoislands results in programmable tuning of plasmon resonance wavelength in a broadband visible range. Such extraordinary tuning capability opens up a new direction for plasmonic enhancement in biophotonic applications such as surface-enhanced Raman scattering or plasmon-enhanced fluorescence.

Publisher URL: http://dx.doi.org/10.1021/acsami.7b10715

DOI: 10.1021/acsami.7b10715

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