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
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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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    • "Unfortunately, in many applications , Joule heating loss, inherent in plasmonic excitations, is problematic. To overcome this, hybrid photonic–plasmonic devices have been proposed [7,8], including metal–dielectric waveguides with reduced absorption losses9101112, as well as nonmetallic structures based on dielectric nanostructured surfaces [13,14] . Recently, it has been recognized that highrefractive-index dielectrics could replace metallic components in particular applications to avoid the problem of strong light absorption in metals. "
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    ABSTRACT: We present a comparative theoretical study of the optical response of metallic Ag and dielectric Si sphere arrays on top of reflecting substrates. The interaction of particle modes with guided modes of the substrate leads to a rich optical spectrum. We design structures that sustain highly concentrated electromagnetic fields around periodic arrays of Si nanoparticles through the coupling of incident light to waveguide modes of a dielectric spacer. We discuss the origin of the different modes responsible for the reflectivity spectra of particle arrays and propose that all dielectric structures can support strong field enhancement which is similar to nanostructured metallic surfaces. (C) 2015 Optical Society of America
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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.
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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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