Realizing Optical Magnetism from Dielectric Metamaterials

Sandia National Laboratory, Albuquerque, New Mexico 87185, USA.
Physical Review Letters (Impact Factor: 7.51). 03/2012; 108(9):097402. DOI: 10.1103/PhysRevLett.108.097402
Source: PubMed


We demonstrate, for the first time, an all-dielectric metamaterial composite in the midinfrared based on micron-sized, high-index tellurium dielectric resonators. Dielectric resonators are desirable compared to conventional metallodielectric metamaterials at optical frequencies as they are largely angular invariant, free of Ohmic loss, and easily integrated into three-dimensional volumes. Measurements and simulation provide evidence of optical magnetism, which could be used for infrared magnetic mirrors, hard or soft surfaces, and subwavelength cavities.

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    • ",[10]), with the promise of bypassing the high Ohmic losses of metallic structures. Experimental validations of the concept were provided in the form of reflectarrays operating at mid-infrared frequencies in [11] and at visible wavelengths in [12]. The nano-structure described in this last paper was proposed by our group and is illustrative of the challenges to be solved on the way to extreme scaling of DRAs to visible wavelengths, as described in the following. "
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    ABSTRACT: This paper reviews the concept of dielectric resonator antennas (DRAs) scaled to nanometer dimensions for operation at infrared and visible wavelength. In comparison to resonant metallic structures which are affected by large plasmonic losses at optical frequencies, dielectric resonator nano-antennas appear very attractive since they are predominantly based on displacement currents. In this context, recent years have seen the emergence of nano-structured optical devices based on fundamental resonances in low-loss dielectric structures. The present paper describes how methods developed at radio-frequencies, in particular the design of DRAs and reflectarrays, can contribute to the creation of efficient devices for the manipulation of light.
    2015 IEEE International Symposium on Antennas and Propagation & USNC/URSI National Radio Science Meeting; 07/2015
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    • "While the spectral range for localized plasmonic modes has been successfully pushed into the infrared using such materials, the plasmonic origin of the modes implies that they are still limited by the relatively fast electron/plasma scattering (typically on the order of 10–100 fs) [41] [42] [43]. On the other hand, the use of dielectric materials can dramatically reduce optical losses [44] [45] [46] [47] [48] [49] [50], but resonators with sub-diffraction optical confinement cannot be achieved using positive permittivity materials. "
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    Nanophotonics 04/2015; 4(1):44-68. DOI:10.1515/nanoph-2014-0003 · 5.69 Impact Factor
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    ABSTRACT: In this paper, we report experimentally and numerically on coupling effects of dielectric metamaterial dimer (metadimer) which composed of two identical ceramic cubes with high permittivity. The distance dependence of Mie resonance for metadimer is investigated under various polarizations of external wave. By changing the configurations and alignment of dimer resonator, it is revealed that magnetic and electric resonances of metadimer exhibits a red/blue shift, resulting from longitudinal or transverse coupling effects of dipoles. Besides, quasi bound states between tightly stacked dielectric cubes are also been pointed out for electric Mie resonance, which is responsible for an unexpected frequency shift with a reverse variation.
    Progress In Electromagnetics Research 01/2012; 132:587-601. DOI:10.2528/PIER12081304 · 1.23 Impact Factor
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