Research Papers

Internally twisted spatially dispersive optical metamaterials

[+] Author Affiliations
Andriy Shevchenko

Aalto University, Department of Applied Physics, P.O. Box 13500, FI-00076 Aalto, Finland

Patrick Grahn

Aalto University, Department of Applied Physics, P.O. Box 13500, FI-00076 Aalto, Finland

Matti Kaivola

Aalto University, Department of Applied Physics, P.O. Box 13500, FI-00076 Aalto, Finland

J. Nanophoton. 8(1), 083074 (Oct 27, 2014). doi:10.1117/1.JNP.8.083074
History: Received July 11, 2014; Revised September 24, 2014; Accepted September 26, 2014
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Abstract.  We introduce and theoretically describe internally twisted optical metamaterials, in which the metamolecules can have an arbitrary, but common, orientation in the unit cells. The molecules, and consequently the material, are not chiral, but they are allowed to be noncentrosymmetric. While such internally twisted crystalline structures are difficult to find in natural materials, metamaterials of this type can be designed and fabricated at will. Here, we present a theoretical method that enables a detailed analysis of such metamaterials. The method establishes a connection between the optical properties of a metamaterial and the plane-wave optical response of a single two-dimensional array of metamolecules. In the theory, the effective wave parameters, such as the refractive index and wave impedance, are retrieved. Using the model, we show that these parameters can dramatically depend on the wave propagation direction and metamolecular orientation, which can be used, along with optical anisotropy, to efficiently adjust and control the plane-wave content of optical beams.

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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Andriy Shevchenko ; Patrick Grahn and Matti Kaivola
"Internally twisted spatially dispersive optical metamaterials", J. Nanophoton. 8(1), 083074 (Oct 27, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083074


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