We experimentally observe magnetic resonance in the visible frequency region from self-assembled silver nanocluster metamaterials. Extensive numerical modeling studies were conducted to find the optimal nanocluster dimensions. Self-assembly of silver nanoparticles coated with nanoscale silica coating was then performed on polymer templates fabricated by laser interference lithography. The nanoclusters supported magnetic resonance in the visible region, and the extracted effective permeability exhibited Lorentz-like resonance. The experimentally observed lowest value for the real part of permeability was 0.06. The nanocluster metamaterial represents a practical metamaterial architecture that is compatible with the scalable bottom-up manufacturing process.
© 2010 Optical Society of America
Original Manuscript: August 3, 2009
Revised Manuscript: September 30, 2009
Manuscript Accepted: October 2, 2009
Published: October 29, 2009
Venkata Ananth Tamma, Jin-Hyoung Lee, Qi Wu, and Wounjhang Park, "Visible frequency magnetic activity in silver nanocluster metamaterial," Appl. Opt. 49, A11-A17 (2010)