A conjugated small molecule containing a benzodithiophene unit shows high performance in bulk heterojunction (BHJ) solar cells. Using the simple solution spinning process, PCE is achieved by employing this as donor BHJ Detailed facts of importance to specialist readers are published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available submitted authors. Please note: The publisher responsible for content functionality any supporting...

We present a dynamically wavelength tunable plasmonically induced transparency (PIT) planar device composed of periodically patterned graphene nanostrips for the mid-infrared region. The PIT effect can be achieved by single layer fixed Fermi energy. resonant tuned while maintaining modulation strength, transmission peaks, and spectral line width varying energy without re-optimizing re-fabricating nanostructures. A three-level plasmonic system is demonstrated to well explain formation...

Coding acoustic metasurfaces can combine simple logical bits to acquire sophisticated functions in wave control. The achieve a phase difference of exactly π and perfect match the amplitudes for transmitted waves. By programming coding sequences, with various functions, including creating peculiar antenna patterns waves focusing, have been demonstrated. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed may be...

Conjugated small molecules can show excellent performance in bulk heterojunction solar cells. Using a simple solution spinning process, high power conversion efficiencies have been achieved by employing these molecules. As an example, DCAO7T/PC61BM based cells exhibit efficiency values of up to 5.08%, with short- circuit current density 10.74 mA/cm2, open-circuit voltage 0.86 V, and fill factor 55.0%. Detailed facts importance specialist readers are published as "Supporting Information"....

We present the design specifications and in-depth analysis of a terahertz (THz) broadband cross-polarization converter composed single-layer metasurface. This device can convert linearly polarized light into its in transmission mode. Different from other polarization conversion devices, this effect results suppression enhancement for different electric components. The characteristic is also achieved by specific partial symmetries designed structure. proposed aid development novel plasmonic...

Abstract Metasurfaces utilizing engineered metallic nanostructures have recently emerged as an important means to manipulate the propagation of light waves in a prescribed manner. However, conventional metasurfaces mainly efficiently work visible and near-infrared regime lack sufficient tunability. In this work, combining pronounced plasmonic resonance patterned graphene structures with subwavelength-thick optical cavity, we propose demonstrate novel that manifest potential dynamically...

We design and numerically analyze a high-quality (Q)-factor, high modulation depth, multiple Fano resonance device based on periodical asymmetric paired bars in the near-infrared regime. There are four sharp peaks arising from interference between subradiant modes magnetic dipole mode that can be easily tailored by adjusting different geometric parameters. The maximal Q-factor exceed 105 magnitude, depths ΔT reach nearly 100%. Combining narrow line-widths with strong near-field confinement,...

Colors with high saturation are of prime significance for display and imaging devices. So far, structural colors arising from all-dielectric metasurfaces, particularly amorphous silicon titanium oxide, have exceeded the gamut standard RGB (sRGB) space. However, excitation higher-order modes dielectric materials hinders further increase saturation. Here, to address challenge, we propose a new design strategy multipolar-modulated metasurfaces multi-dielectric stacked layers realize deep...

Abstract 2D layered materials have sparked great interest from the perspective of basic physics and applied science in past few years. Extraordinarily, many novel stacked structures that bring versatile properties applications can be artificially assembled, as exemplified by vertical van der Waals (vdW) heterostructures, twisted multilayer materials, hybrid dimensional structures, etc. Compared with ordinary synthesis process, stacking technique is a powerful strategy to achieve high‐quality...

Harnessing light for modern photonic applications often involves the control and manipulation of polarization phase. Traditional methods require a combination multiple discrete optical components, each which contributes to specific functionality. Here, plasmonic metasurfaces are proposed that accomplish simultaneous phase transmitted light. Arbitrary spatial field distribution direction can be obtained. The multifunctional validated by demonstrating broadband near‐perfect anomalous...

Novel covalently porphyrin-functionalized single-walled carbon nanotubes (SWNTs) have been synthesized by the reaction of SWNTs with in situ generated porphyrin diazonium compounds. The resulting nanohybrid was characterized spectroscopic (UV-Vis-NIR, FTIR and Raman) microscopic (TEM AFM) methods. Raman absorption spectroscopy data showed that electronic properties modified tubes were mostly retained, without damaging their one-dimensional properties. fluorescence from moiety almost...

Single-walled carbon nanotubes covalently functionalized with porphyrins present enhanced optical limiting effects. Both and SWNTs are good candidates for applications. The porphyrin-covalently offer superior performance to C60, the individual SWNTs, because of a combined nonlinear mechanism photoinduced electron or energy transfer between porphyrin moiety SWNTs.

We present a mid-IR highly wavelength-tunable broadband cross polarization conversion composed of single patterned top layer with L-shaped graphene nanostructures, dielectric spacer, and gold plane layer. It can convert linearly polarized light to its in the reflection mode. The be dynamically tuned realize effect by varying Fermi energy without reoptimizing refabricating nanostructures. This offers further step developing tunable polarizers switchers.

Abstract The arbitrary control of the polarization states light has attracted interest scientific community because wide range modern optical applications that such can afford. However, conventional setups are bulky and very often operate only within a narrow wavelength range, thereby resisting system miniaturization integration. Here, we present basic theory, simulated demonstration in-depth analysis high-performance broadband invertible linear-to-circular (LTC) converter composed...

Ultrafast carrier dynamics and saturable absorption of few-layered graphene oxide, well-dispersed in organic solvent, are studied using femtosecond pump-probe Z-scan techniques. The results demonstrate that oxide has a fast energy relaxation hot carriers strong absorption, which is comparable with reduced oxide. Fast combined well solution processing capability arises from the large fraction sp2 carbon atom inside sheet together oxidation mainly existing at edge areas. This superiority will...

We present the design, characterization, and experimental demonstration of a polarization insensitive omnidirectional broadband near perfect planar metamaterial absorber (MA) in infrared regime, which does not need to stack multilayer composite structures. Experimental result shows that greater than 80% absorption is obtained across wavelength range 0.41 μm, reasonable agreement with simulation. The electromagnetic response MA theoretically investigated. remains high even at large incident angles.

Abstract Fourier optics, the principle of using transformation to understand functionalities optical elements, lies at heart modern and it has been widely applied information processing, imaging, holography, etc. While a simple thin lens is capable resolving components an arbitrary wavefront, its operation limited near normal light incidence, i.e., paraxial approximation, which puts severe constraint on resolvable domain. As result, high‐order are lost, resulting in extinction...

Abstract Relative to conventional phase‐modulation optical elements, metasurfaces (i.e., 2D versions of metamaterials) have shown novel phenomena and promising functionalities with more compact platforms straightforward fabrication processes. With the ability generate a spatial phase variation, wavefronts can be manipulated into arbitrary shapes at will, enabling new integrated ultrathin devices explored. This review is focused on recent developments regarding manipulation electromagnetic...

Metasurfaces, which are capable of generating structure and wavelength dependent phase shift, have emerged as promising means for controlling the wavefront electromagnetic waves. Finding new ways to realize broadband frequency response well maintaining high conversion efficiency still requires research efforts. For design plasmonic metasurfaces, graphene represents an attractive alternative metals due its strong field confinement versatile tunability. Here, a novel metasurface based on is...

We present a mid-IR highly tunable optical polarization converter composed of asymmetric graphene nanocrosses. It can convert linearly polarized light to circularly and elliptically or exhibit giant activity at different wavelengths. The transmitted wavelength states also be dynamically tuned by varying the Fermi energy graphene, without reoptimizing refabricating nanostructures. This offers further step in developing controllable converter.