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Properties of nanostructured metamaterials at optical frequencies
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2008 (English)Conference paper (Refereed)
Abstract [en]

A variety of metamaterials has been demonstrated recently that support backward waves and negative refraction (Negative Index Materials, NIM.) In particular, these materials enable sub-wavelength resolution that makes them even more interesting, especially in optical domain rather than at microwave frequencies where their unusual properties were known for decades. We describe below theoretical and experimental studies of the so-called 'fishnet' metal-spacer holearray metamaterials, which exhibit NIM behavior at optical frequencies, having unit cell size of a few 100s nm. We demonstrate experimentally that their refractive index can be modulated very fast and very strongly (from -2.4 to -1.5) around the communication wavelength of =1.55 um, in good agreement with the FDTD results. We also discuss a problem of loss compensation in those materials with hefty Ohmic losses by using gain media and local field enhancement in metallic nanoparticles ensembles that enable SERS.

Place, publisher, year, edition, pages
, Proceedings of SPIE - The International Society for Optical Engineering, ISSN 0277-786X ; 7135
Keyword [en]
Backward wave, Extraordinary transmission, Metamaterial, Negative Index, Ohmic losses, Optical frequencies, Surface enhanced raman spectroscopy (sers), Light refraction, Light transmission, Natural frequencies, Optical materials, Optoelectronic devices, Raman scattering, Raman spectroscopy, Rectangular waveguides, Refractive index, Spectrum analysis, Surfaces, Wave transmission, Metamaterials
National Category
Nano Technology
URN: urn:nbn:se:kth:diva-154095DOI: 10.1117/12.807181ScopusID: 2-s2.0-62649156450OAI: diva2:759696
Optoelectronic Materials and Devices III; Hangzhou; China; 27 October 2008 through 30 October 2008

QC 20141030

Available from: 2014-10-30 Created: 2014-10-14 Last updated: 2014-10-30Bibliographically approved

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Thylén, Lars
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Microelectronics and Applied Physics, MAP
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