Enhancement and manipulation of light absorption in graphene is a significant issue for applications graphene-based optoelectronic devices. In order to achieve this purpose the visible region, we demonstrate design optical absorber inspired by metal-dielectric-metal metamaterial perfect electromagnetic waves. The absorbance ratios single three atomic layer are enhanced up 37.5% 64.8%, respectively. shows polarization-dependence tolerates wide range incident angles. Furthermore, peak position...

We demonstrate that a broadband terahertz absorber with near-unity absorption can be realized using net-shaped periodically sinusoidally-patterned graphene sheet, placed on dielectric spacer supported metallic reflecting plate. Because of the gradient width modulation unit continuous plasmon resonances excited, and therefore achieved. The results show absorber's normalized bandwidth 90% absorbance is over 65% under normal incidence for both TE TM polarizations when chemical potential set as...

Abstract Surface plasmon polaritons (SPPs) are extremely sensitive to the surrounding refractive index and have found important applications in ultrasensitive label‐free sensing. Reducing linewidth of an SPP mode is effective way improve figure merit (FOM) hence sensitivity plasmonic mode. Many efforts been devoted achieving a narrow by coupling, which inevitably results asymmetrical lineshape compromising performance. Instead, modes directly narrowed elaborately engineering periodic...

The research of metamaterial shows great potential in the field solar energy harvesting. In past decade, design broadband absorber (SMA) has attracted a surge interest. conventional typically requires brute-force optimizations with huge sampling space structure parameters. Very recently, deep learning (DL) provided promising way design, but its application on SMA development is barely reported due to complicated features spectrum. Here, this work develops DL model based spectrum transformer...

Abstract We investigate the effect of water adsorption on electrical properties graphene oxide (GO) films using direct current (DC) measurement and alternating (AC) complex impedance spectroscopy. GO suspension synthesized by a modified Hummer's method is deposited Au interdigitated electrodes. The strong interaction molecules with was observed through characterizations. DC results show that are humidity- applied voltage amplitude-dependent. AC spectroscopy used to analyze mechanism between...

To understand the effects of Ag nanoparticles (NPs) on performance organic solar cells, we examined properties hybrid poly(3-hexylthiophene):[6,6]-phenyl-C61-butyric-acid-methyl-ester:Ag NP cells using photoinduced charge extraction with a linearly increasing voltage. We find that addition NPs into active layer significantly enhances carrier mobility but decreases total extracted carrier. Atomic force microscopy shows tend to phase segregate from material at high concentrations. This...

A transparent and flexible graphene charge-trap memory (GCTM) composed of a single-layer channel 3-dimensional gate stack was fabricated on polyethylene naphtalate substrate below eutectic temperatures (~110 °C). The GCTM exhibits functionality ~8.6 V window 30% data retention per 10 years, while maintaining ~80% transparency in the visible wavelength. Under both tensile compressive stress, shows minimal effect program/erase states on-state current. This can be utilized for electronics that...

We establish an adaptive batch-normalized neural network, aiming to implement smart and rapid inverse design for graphene-based metamaterials with on-demand optical responses.

Two-dimensional materials (2DMs) such as graphene and black phosphorus (BP) have aroused considerable attentions in the past few years. Engineering enhancing their light-matter interaction is possible due to support for localized surface plasmon resonances infrared regime. In this paper, we proposed an broadband absorber consisting of multilayer graphene-BP nanoparticles sandwiched between dielectric layers. Benefiting from properties BP, exhibits both perfect responses strong anisotropy...

Surface-enhanced Raman spectroscopy (SERS) is a highly sensitive technique with molecular specificity, making it an ideal analytical tool in various fields. However, the breadth of practical applications SERS has been severely limited because still great challenge to achieve simultaneously high sensitivity and reproducibility. Herein, we report controllable method fabricate periodic bowtie substrates narrow nanogap, enhancement, good uniformity over large area. The template first fabricated...

In this paper, we theoretically design a dual-band graphene-based terahertz (THz) absorber combining the magnetic resonance with THz cold mirror without any metallic loss. The absorption spectrum of all-dielectric can be actively manipulated after fabrication due to tunable conductivity graphene. After delicate optimization, two ultra-narrow peaks are achieved respective full width at half maximum (FWHM) 0.0272 and 0.0424 THz. Also, investigate effect geometric parameters on performance....

Abstract Metasurfaces are planar or 2D forms of metamaterials made up arrays antennas with a subwavelength thickness. They have been rapidly developed in the recent years due to their ability manipulate light–matter interaction both linear and non‐linear regimes at nanoscale. Various metasurfaces display remarkable optical features, such as acute resonance, significant near‐field enhancement, suitable capacity support electric magnetic modes, on account strong low loss. Due these important...

Terahertz (THz) molecular fingerprint sensing provides a powerful label-free tool for the detection of trace-amount samples. Due to weak light–matter interaction, various metallic or dielectric metasurfaces have been adopted enhance absorbance signals. However, they suffer from strong background damping complicated sample coating on patterned surfaces. Here, we propose an inverted metagrating and broadband THz trace analytes planar surface. Enhancement signal originates effects evanescent...

Plasmonic metasurfaces (PMs) functionalized with the monoclonal antibody (mAb) are promising biophotonic sensors for biomolecular interaction analysis and convenient immunoassay of various biomarkers, such as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants. Previous PM biosensing suffers from slow affinity detection rate lack sufficient studies on SARS-CoV-2 Here, we develop a high-efficiency testing method based label-free mAbs demonstrate their binding characteristics...

The metasurface is a powerful tool for trace analyte sensing in label-free manner by amplifying their THz molecular fingerprint signals. However, current technologies are still facing the problems of high background noise and narrow working bandwidth. Here, we propose broadband dielectric sensor based on guided mode resonances (GMRs) with dual-degree-of-freedom configuration, which boosts generation multiplexed quasi-bound states continuum (quasi-BICs). Our design shows extraordinary...

We report the experiment of high quality epitaxial growth Bi2Se3 thin films on hexagonal CdS (0001) substrates using a solid source molecular-beam epitaxy system. Layer-by-layer single crystal has been observed from first quintuple layer. The size surface triangular terraces exceeded 1 μm. Angle-resolved photoemission spectroscopy clearly reveals presence Dirac-cone-shape states. Magneto-transport measurements demonstrate Hall mobility ∼6000 cm2/V s for as-grown at temperatures below 30 K....

Abstract Radioresistance poses a major challenge in nasopharyngeal carcinoma (NPC) treatment, but little is known about how miRNA (miR) regulates this phenomenon. In study, we investigated the function and mechanism of miR-203 NPC radioresistance, one downregulated miRs radioresistant cells identified by our previous microarray analysis. We observed that was frequently tissues compared with radiosensitive tissues, its decrement significantly correlated radioresistance poor patient survival,...

We present the incorporation of periodic gold nanoparticle arrays into graphene-based photodetectors to enhance and tune light absorption graphene. By use electromagnetic simulations, we show that in graphene can be manipulated by tuning plasmonic resonance. A maximum 30.3% with a full width 135 nm at half is achieved through systematic optimization nanostructures.

We present a plasmonic nanostructure design by embedding layer of hexagonal periodic metallic nanospheres between the active and transparent anode for bulk heterojunction organic solar cells. The hybrid structure shows broadband optical absorption enhancement from localized surface plasmon resonance with weak dependence on polarization incident light. also theoretically study optimization to enhance up 1.90 times typical based low band gap material.

Terahertz (THz) sensing of molecular fingerprint enables wide applications in biomedicine and security detection. Conventional detection approaches face big barriers trace analysis analyte due to the difficulties enhancing broadband absorption. In order achieve strong wave–matter interaction for analyte, we propose a method based on THz wave angular scanning dielectric metagrating. virtue guided-mode resonance, one can strengthen local electric field various trace-amount analytes by tuning...

We numerically demonstrate a broadband terahertz (THz) absorber that is based on hybrid-patterned graphene metasurface with excellent properties of polarization insensitivity, wide-angle, and active tunability. Our design made up single-layer periodically arranged hybrid square/disk/loop patterns multilayer structure. find absorption 90% absorbance the fractional bandwidth 84.5% from 1.38 THz to 3.4 can be achieved. Because axisymmetric configuration, demonstrates absolute independence for...