Plasmonic Metamaterials

Authored by: Tanaka Takuo

Nanofabrication Handbook

Print publication date:  February  2012
Online publication date:  February  2012

Print ISBN: 9781420090529
eBook ISBN: 9781420090536
Adobe ISBN:

10.1201/b11626-24

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Abstract

Plasmonic metamaterial is an artificially designed material that consists of nanoscale metal structures (Figure 20.1). The most interesting feature of the plasmonic metamaterials is that their electromagnetic properties are not only because of their composition but also because of their subwavelength-engineered metallic structures. By engineering such materials, we can create materials exhibiting desired electromagnetic properties not attainable with naturally occurring materials. The creation of the magnetically active material is one of the most important and interesting applications of the metamaterial because all materials in nature lose magnetic response and their µ in the THz frequency region is fixed at unity (Landau et al. 1984). The magnetic metamaterial with µ ≠ 1 produces a great number of novel materials in the optical frequency region, which enables us to manipulate light freely (Cai et al. 2007). For example, “cloaking effect,” which renders the object invisible, was proposed (Dolling et al. 2007; Alù and Engheta 2005) and experimentally investigated at a microwave region (Schurig et al. 2006). The concept of the metamaterial is introducing a new paradigm in the research field from the microwave region to the optical region. In this chapter, the theoretical background of the plasmonic metamaterials with a discussion about the appropriate materials and structures to gain the magnetism in the visible light region are described, and then some nanofabrication techniques utilized for metamaterials are reviewed. The chapter closes with a discussion on the application of the metamaterials for optical devices using its unprecedented optical properties.

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