SPEAKER: Dr. Willie Padilla
DATE: Tuesday, 7 May 2013
VENUE: B18 Ingkarni Wardli Bldg, University of Adelaide
Abstract: Metamaterials are engineered artiﬁcial materials that consist of subwavelength, periodic metallic inclusions, and can exhibit exotic electromagnetic properties not readily available in nature. Over the past decade, the interest of the scientific and engineering communities for developing such metamaterial structures has been continuous and increasing. Experimental realizations of negative index of refraction, invisibility cloaks, and perfect lenses all served to ignite the ﬁeld. As metamaterial research continues to mature, demonstrations of practical devices will become increasingly important for continued growth. Recently near unity absorption has been achieved with metamaterials and results show that the fundamental light interactions of surfaces may be dynamically controlled. We show metamaterials which achieve total absorption of electromagnetic waves and present several methods capable of tuning absorption values with high dynamic range and highlight several novel applications at terahertz and infrared wavelengths.
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