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Multiscale Patterning of Plasmonic Metamaterials

Surface plasmons - collective oscillations of free charges - on metal surfaces have resulted in demonstrations of enhanced optical transmission, collimation of light through a subwavelength aperture, negative permeability and refraction at visible wavelengths, and second-harmonic generation. The structures that display these plasmonic phenomena typically consist of ordered arrays of particles or holes with sizes of the order of 100 nm. At the NU-MRSEC, a new nanofabrication technique based on soft interference lithography was used to manufacture multiscale arrays of nanoparticles and nanoholes with unexpected optical properties. free-standing gold film perforated with 100-nm holes

This scanning electron microscopy image depicts a free-standing gold film perforated with 100-nm holes patterned in microscale patches.