Using metamaterial absorbers, we have shown that metallic layers in the absorbers do not necessarily constitute undesired resistive heating problem for photovoltaics. Tailoring geometric skin depth of metals and employing natural bulk absorbance characteristics semiconductors those can enable exchange losses with useful optical active semiconductors. Thus, Ohmic loss dominated be converted into photovoltaic near-perfect advantage harvesting full potential light management offered by...

Losses in metamaterials render the applications of such exotic materials less practical unless an efficient way reducing them is found. We present two different techniques to reduce ohmic losses at both lower and higher frequencies, based on geometric tailoring individual magnetic constituents. show that increased radius curvature, general, leads least metamaterials. Particularly THz bulky structures outperform planar structures.

We study the radiation properties of electrically small resonant antennas (ka<1) composed electric-field-coupled (ELC) and complementary (CELC) resonators a monopole antenna. use such parasitic ELC CELC “metaresonators” to design various antennas. In particular, monopole-excited bent-monopole-excited resonator are proposed that provide very low profiles on order λ0/20. compare performance against more conventional designs based upon split-ring resonators.

Electromagnetic negative refraction in metamaterials has attracted increasingly great interest since its first experimental verification 2001. It potentially leads to the applications superior conventional devices including compact antennas for mobile stations, imaging beyond diffraction limit, and high-resolution radars, not mention anomalous wave propagation fundamental optics. Here, we report how could be used simulate ``negative of spin-zero particles interacting with a strong potential...

Metamaterials have introduced a whole new world of unusual materials with functionalities that cannot be attained in naturally occurring material systems by mimicking and controlling the natural phenomena at subwavelength scales. However, inherent absorption losses pose fundamental challenge to most fascinating applications metamaterials. Based on novel plasmon injection (PI or $\mathrm{\ensuremath{\Pi}}$) scheme, we propose coherent optical amplification technique compensate Although proof...

Near-field optics and superlenses for imaging beyond Abbe’s diffraction limit are reviewed. A comprehensive contemporary background is given on scanning near-field microscopy superlensing. Attention brought to recent research leveraging optical with new nano-imaging capabilities. Future directions explored realizing the goal of low-cost high-performance sub-diffraction-limited systems.

Isotropic negative index metamaterials (NIMs) are highly desired, particularly for the realization of ultra-high resolution lenses. However, existing isotropic NIMs function only two-dimensionally and cannot be miniaturized beyond microwaves. Direct laser writing processes can a paradigm shift toward fabrication three-dimensionally (3D) bulk optical metamaterials, but at expense an additional design constraint, namely connectivity. Here, we demonstrate with proof of-principle that...

We study polarization independent improved light trapping in commercial thin film hydrogenated amorphous silicon (a-Si:H) solar photovoltaic cells using a three-dimensional silver array of multi-resonant nano-disk structures embedded nitride anti-reflection coating to enhance optical absorption the intrinsic layer (i-a-Si:H) for visible spectrum any angle. Predicted total enhancement (OE) i-a-Si:H AM-1.5 is 18.51% as compared reference, and producing 19.65% improvement short-circuit current...

Plasmonics is a rapidly emerging platform for quantum state engineering with the potential building ultra-compact and hybrid optoelectronic devices. Recent experiments have shown that despite presence of decoherence loss, photon statistics entanglement can be preserved in single plasmonic systems. This preserving ability should carry over to metamaterials, whose properties are result many individual systems acting collectively, used engineer optical states light. Here, we report an...

A four-member homogenous quadrumer composed of silver core-shell nanostructures is tailored to enhance photothermal heat generation efficiency in sub-nanosecond time scale. Calculating the plasmonic and responses metallic cluster, we show that it possible achieve thermal flux 64.7 μW.cm-2 temperature changes range ΔT = 150 K, using Fano resonant effect. Photothermal even further enhanced by adding carbon nanospheres offset gap between particles obtained 93.3 increase 172 K. It also shown...

We show the designs of bulk one- and two-dimensionally isotropic photonic negative index metamaterials working around telecom wavelengths. The designed structures are inherently connected, which makes fabrication by direct laser writing chemical vapor deposition or other techniques possible.

We propose an alternative class of magneto-optical metamaterials offering enhanced angle rotation in polarization compared to pure materials. In this approach, the permittivity tensor a material is tailored by embedded wire meshes. show that metamaterial can be up 9 times alone, while extinction ratio remains below −20dB over more than 2 THz bandwidth and attenuation coefficient approximately 1.5dB μm−1.

Using interplay between surface plasmons and metamaterials, we propose a new technique for novel metamaterial designs. We show that existing on thin metal surfaces can be used to "drive" non-resonant structures in their vicinity provide types of electric magnetic resonators. These resonators strictly adhere plasmon dispersion the host film. The operating frequency resultant metamaterials scaled extremely high frequencies, otherwise not possible with conventional split-ring-resonator-based...

This study investigates ultra-thin transparent conducting oxides (TCO) of indium tin oxide (ITO), aluminum-doped zinc (AZO) and (ZnO) to determine their viability as candidate materials for use in plasmonic-enhanced thin-film amorphous silicon solar photovoltaic (PV) devices. First a sensitivity analysis the optical absorption intrinsic layer nano-disk patterned silicon-based cell function TCO thickness (10–50 nm) was performed by simulation. These simulation results were then used guide...

Abstract We propose and systematically investigate a novel tunable, compact room temperature terahertz (THz) source based on difference frequency generation in hybrid optical THz micro-ring resonator. describe detailed design steps of the capable generating wave 0.5–10 with tunability resolution 0.05 by using high second order susceptibility (χ (2) ) crystals polymers. In to enhance compared bulk nonlinear material, we employ resonator high-Q resonant modes for infrared input waves. Another...

We propose a scheme for the distillation of partially entangled two-photon Bell and three-photon W states using metamaterials. The is achieved by two metamaterials with polarization dependence, one which rotated π/2 around direction propagation photons. On other hand, dependent metamaterial independent Upon transmission photons through entanglement increases they become distilled. This work opens up new directions in quantum optical state engineering showing how can be used to carry out...

Robust transmission of spatial, spectral, or temporal distributions light through complex disordered media such as a turbulent atmosphere, biological tissue, turbid remains critical obstacle in many research fields involving imaging, diagnosis, sensing, and communications. Inspired from virtual-gain technique for loss compensation metamaterials, active convolved illumination (ACI) has been recently proposed ubiquitous optical to significantly enhance information transport hence data...

We demonstrate that surface plasmons of a thin metal film interacting with periodic array nano-structures around it can be utilized to make bulk negative index metamaterials at visible spectrum simultaneously permittivity and permeability. These plasmon driven have high figure merit tuned arbitrarily operate any wavelength in the possibly ultraviolet spectrum. numerically idea by metamaterial structure which exhibits strong magnetic response resulting refraction green region electromagnetic...

We present the first dual-band negative index metamaterial that operates in visible spectrum. The optimized four-functional-layer structure exhibits double-negative (i.e., simultaneously permittivity and permeability) band red region of spectrum with a figure merit 1.7 second green 3.2. optical behavior proposed is independent polarization incident field. This low-loss can be treated as modified version fishnet an additional metal layer different thickness single functional layer. extends...

In this paper, the optical properties and imaging performance of a non-ideal Pendry's negative index flat lens with practical value for loss are studied. Analytical calculations performed, those results used to further study corresponding system numerically. An inverse filter emulating plasmon injection scheme compensation in metamaterials is applied from system, resulting perfect reconstruction previously unresolved image that demonstrates sub-diffraction-limited resolution.

The Earth's atmosphere has significant effects on the propagation of electromagnetic (EM) radiation and accordingly degrades performance electro-optical systems. These are attributed to atmospheric turbulence absorption scattering EM waves by molecules aerosols. In this paper we develop a detailed model optical propagating from object plane an imaging system based classical theory scattering. Scattering effect de-correlating light leaving target unscattered reaching system, broadening angle...

Stimulated emission depletion microscopy inspired direct laser writing (STED-DLW) processes can offer diffraction-unlimited fabrication of 3D-structures, not possible with traditional electron-beam or optical lithography. We propose a hyperbolic metamaterial for STED-DLW. First, we design meandering wire structures three different magnetic dipoles which be excited under incidences light. Then, based on effective parameters corresponding to normal incidence and lateral incidence, find that...