An ultra-broadband electromagnetically indefinite medium formed by aligned carbon nanotubes

Details An ultra-broadband electromagnetically indefinite medium formed by aligned carbon nanotubes An ultra-broadband electromagnetically indefinite medium formed by aligned carbon nanotubes

2011-02-25

arxiv.org/abs/1102.5263v1

Physics

Optics

4 pages

Scientific paper

Anisotropic materials with different signs of components of the permittivity tensor are called indefinite materials. Known realizations of indefinite media suffer of high absorption losses. We show that periodic arrays of parallel carbon nanotubes (CNTs) can behave as a low-loss indefinite medium in the infrared range. We show that a finite-thickness slab of CNTs supports the propagation of backward waves with small attenuation in an ultra-broad frequency band. In prospective, CNT arrays can be used for subwavelength focusing and detection, enhancing the radiation efficiency of small sources.

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