Properties of nanostructured metamaterials at optical frequencies

摘要：

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 λ=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.

关键词： metamaterial negative index backward wave optical frequencies Ohmic losses extraordinary transmission Surface Enhanced Raman Spectroscopy (SERS)

作者: A.M.Bratkovsky E.Ponizovskaya E.Kim W.Wu Y.R.Shen S.-Y.Wang L.Thylen

作者单位: Hewlett-Packard Laboratories,1501 Page Mill Road,MS 1123,California 94304; Dept.Physics,University of California,Berkeley CA 94720 Hewlett-Packard Laboratories,1501 Page Mill Road,MS 1123,California 94304;Dept.Microelectr.and Appl.

会议类型: 国际会议

会议名称: 2008亚太光通信会议(Asia-Pacific Optical Communications 2008)

会议地点: 杭州

会议语种:英文

在线出版日期: 2008-10-26（万方平台首次上网日期，不代表论文的发表时间）