Plasmonic nanoantennas provide new routes for efficiently detecting, analyzing, and monitoring single biomolecules via fluorescence, Raman, infrared absorption spectroscopies. The development of efficient biosensors multispectral spectroscopy remains nevertheless limited by the narrowband responses plasmonic devices, as they are generally designed to operate in a specific bandwidth, matching with absorption, scattering, or emission frequency target under investigation. Therefore, performing...

An epsilon-near-zero graded-index converging lens with planar faces is proposed and analyzed.Each perfectly-electric conducting (PEC) waveguide comprising the operates slightly above its cut-off frequency has same length but different cross-sectional dimensions.This allows controlling individually propagation constant normalized characteristic impedance of each for desired phase front at output while Fresnel reflection losses are minimized.A complete theoretical analysis based on theory...

An all-metallic steerable beam antenna composed of an ε-near-zero (ENZ) metamaterial lens is experimentally demonstrated at 144 GHz (λ0 = 2.083 mm). The ENZ realized by array narrow hollow rectangular waveguides working just near and above the cut-off TE10 mode. focal arc on xz-plane initially estimated analytically as well numerically compared with experimental results demonstrating good agreement. Next, a flange-ended WR-6.5 waveguide placed along to evaluate ENZ-lens steerability. A gain...

The performance of an epsilon-near zero (ENZ) plano-concave lens is experimentally demonstrated and verified at the D-band millimeter-waves. comprised array narrow metallic waveguides near cut-off frequency, which effectively behaves as epsilon-near-zero medium 144 GHz. A good matching with free space achieved by exploiting phenomenon energy squeezing a clear focus transmission enhancement 15.9 dB measured. shows radiation properties directivity 17.6 dBi low cross-polar components -34 dB....

A 1.5λ0-thick planoconcave zoned lens based on the fishnet metamaterial is demonstrated experimentally at millimeter wavelengths. The zoning technique applied allows a volume reduction of 60% compared to full without any deterioration in performance. structure designed exhibit an effective refractive index n = −0.25 f 56.7 GHz (λ0 5.29 mm) with focal length FL 47.62 mm 9λ0. experimental enhancement achieved 11.1 dB, which good agreement simulation and also previous lenses opens door for...

Lossy mode resonances (LMRs) and surface plasmon resonaces (SPRs) are obtained experimentally with a Kretschmann configuration using BK7 glass prism all sides polished coated indium tin oxide (ITO). The properties of ITO allow for obtaining LMRs SPRs the same experimental setup. results corroborated numerical method calculation reflection in configuration.

Graded index -near-zero (GRIN-ENZ) quasi-optical components such as beam steerers and power splitters are designed, simulated analyzed. The GRIN-ENZ medium is realized using stacked narrow hollow waveguides whose infinite array shows the first transmission peak at 1.0002 THz. Several to channel a normal incident plane wave different output angles (15, 45, 65 80°) with good impedance matching (low reflection) analytically numerically demonstrated planar structures thickness of 5λ0 = 1500 μm...

An indium tin oxide (ITO) refractometer based on the generation of lossy mode resonances (LMRs) and surface plasmon (SPRs) is presented. Both LMRs SPRs are excited, in a single setup, under grazing angle incidence with Kretschmann configuration an ITO thin-film deposited glass slide. The sensing capabilities device demonstrated using several solutions glycerin water refractive indices ranging from 1.33 to 1.47. excited visible range, 617 nm 682 TE polarization 533 637 TM polarization,...

A dual-band quarter-wave plate based on a modified extraordinary transmission hole array is numerically analyzed and experimentally demonstrated at terahertz frequencies. To control independently orthogonal polarizations, the original square holes are connected with vertical slits their lateral straight sides replaced by meander lines. This smart design enables operation unprecedented fractional bandwidths in compact structure. Considering flattening deviation lower than 40% of optimum...

Metallic plates with a two-dimensional (2D) periodic distribution of sub-wavelength apertures are known to exhibit extraordinary transmission electromagnetic waves. Stacking two or more such gives place the so-called fishnet structures, which constitute popular way achieving an effective negative index medium at frequencies ranging from microwaves optics. Unfortunately, general wideband equivalent circuit has not yet been proposed facilitate its understanding and design. This work presents...

An equivalent circuit for the double-fishnet metamaterial is proposed. All lumped elements are inferred from interpretation of electric and magnetic fields as well surface currents generated when structure excited with a normally incident plane wave. The approach provides physical meaningful representation electromagnetic response underlines tight link between fishnet extraordinary transmission phenomenon.

A compact quarter-wave plate (QWP) based on a doubly periodic subwavelength hole array lying over dielectric slab is synthesized analytically under perfect electric conductor assumption and its validity demonstrated numerically for real metals (aluminum silver) at terahertz (THz) near infrared. The form birefringence achieved via the excitation of transverse-magnetic transverse-electric extraordinary transmission resonances perpendicular parallel polarization to short in-plane period,...

We present a mid-infrared inductor that when applied to an extraordinary transmission hole array produces strong redshift of the resonant peak accompanied by unprecedented enlargement operation bandwidth. The importance result is twofold: from fundamental viewpoint, direct applicability equivalent circuit concepts borrowed microwaves demonstrated, in frequencies as high 17 THz upholding unification plasmonics and microwave allowing for simplification structure design analysis; practical...

By interpreting the extraordinary transmission phenomenon on basis of induced surface currents, potential engineering Rayleigh-Wood anomalies is shown, or more specifically, moving down resonant peak away from Rayleigh-Wood's anomaly. The strategy presented here relies simply enlarging path explored by induced-surface current so as to increase inductance structure, shifting consequently lower frequencies because 1/${L}^{1/2}$ dependence. This brings about two important consequences: aperture...

Huge advancements have been made over the years in terms of modern image-sensing hardware and visual computing algorithms (e.g., computer vision, image processing, computational photography). However, to this day, there still exists a current gap between software design an imaging system, which silos one research domain from another. Bridging is key unlocking new capabilities for end applications commercial photography, industrial inspection, robotics. In survey, we explore existing works...

Unidirectional transmission in thin stacked hole arrays (SHAs), whose spatial inversion symmetry is broken by adding a dielectric grating at one of the interfaces, theoretically predicted and experimentally validated millimeter-wave regime. It appears fixed nonzero angle incidence due to hybridization SHA resonances with diffraction effects. In contrast earlier suggested structures relevant unidirectional mechanism, nonsymmetric diode-like structure founded on intrinsically subwavelength...

Efforts to develop 150 mm 4H SiC bare wafer and epitaxial substrates for power electronic device applications have resulted in quality improvements, such that key metrics match or outperform 100 substrates. Total dislocation densities threading screw measured wafers were ~4100 cm -2 ~100 , respectively, compared with values of ~5900 ~300 wafers. While median basal plane counts samples exceed those the smaller platform, a nearly 45% reduction was realized, resulting density ~3900 . Epilayers...

A novel route to achieve a narrowband free-space electromagnetic absorber in any range of the spectrum based on stacked subwavelength hole arrays is proposed.The absorption obtained by means slow light mode inside fishnet-like engineered structure and exploiting unavoidable misalignments bucklings free-standing stack.An incoming pulse becomes permanently trapped due near zero group velocity which causes an enhancement radiation-structure interaction that leads huge increment losses arising...

We conducted Z-scan measurements using ultrashort high-repetition-rate lasers and spectroscopic-grade fused-quartz cuvettes that had undergone macroscopic laser-induced damage in the course of measurements. Visual observation increased scattering laser beam from damaged sites Nomarski microscope images showing changes morphology regions were used as criteria for damage. Intensity-dependent open- closed-aperture studies produced profiles are characteristic extent The appearance these unique...

In this paper, system simulation for future 3GPP R8 Long Term Evolution (LTE) radio access channel in indoor environment is presented. 3D ray tracing algorithms have been developed order to analyze coverage-capacity considerations regarding high modulation schemes present LTE. The results aid modeling the behavior of speed data services 4G systems environments.

This paper presents a measurement system that is capable of characterizing and modeling high-power (>;250W) RF devices outside the standard 50Q environment. The based on Agilent PNA-X Nonlinear Vector Network Analyzer (NVNA) platforms. It configured for measurements commercially available 250W average output power Lateral Diffused Metal Oxide Semiconductor (LDMOS) technology transistor from NXP. A number practical considerations are described in such as setup pulse generators modulators to...