We demonstrate a broadband visible-light absorber based on excitation of multiple propagating surface plasmon (PSP) resonances. The simple structure is constructed continuous gold/silica multi-layers covered by one-dimensional gold grating. broadening bandwidth arises from the inter-layer hybridization and spectral superposition PSPs, which predicted with analytical coupled oscillator model validated using RCWA simulation. average absorption increases number pairs exceeds 95% over whole...

Abstract Shape‐transformable liquid metal (LM) micromachines have attracted the attention of scientific community over past 5 years, but inconvenience transfer routes and use corrosive fuels limited their potential applications. In this work, a shape‐transformable LM micromotor that is fabricated by simple, versatile ice‐assisted printing method demonstrated, in which an ice layer employed as “sacrificial” substrate can enable direct micromotors to arbitrary target substrates conveniently....

Abstract A bioinspired magnetically powered microswimmer is designed and experimentally demonstrated by mimicking the morphology of annelid worms. The structural parameters microswimmer, such as surface wrinkling, can be controlled applying prestrain on substrate for precise fabrication consistent performance microswimmers. resulting annelid‐worm‐like microswimmers display efficient propulsion under an oscillating magnetic field, reaching a peak speed ≈100 µm s −1 . directionality readily...

An ultra-high resolution refractive-index sensor with the Kretschmann configuration was proposed and experimentally demonstrated. The Fano resonance (FR) in attenuated total reflection curve arose from interactions between surface plasmon polariton planar waveguide modes. It shown to depend strongly on structural parameters that governed position of FR be good agreement results electromagnetic calculations. sensitivity by intensity estimated 3.56 × 102-fold higher than conventional sensors.

A polarization-insensitive and angle-independent graphene absorber (GA) with periodically patterned grating is demonstrated. periodic nanocavity composed of multilayer subwavelength metal substrate supports a strongly localized mode inside the cavity, where helps to absorb more electromagnetic waves. The proposed GA exhibits behavior maintains high absorption above 90% within wide range incident angle (more than 80°). We attribute excitation cavity resonance magnetic for transverse electric...

A multiline absorber based on the excitation of guided-mode resonance one-dimensional photonic crystals (1D-PhCs), including a surface graphene monolayer under attenuated-total-reflection configuration, is proposed and demonstrated. By carefully designing structure parameters 1D-PhCs, guided mode can be modulated by periodic distribution refractive index. Our results reveal that critical coupling in periodical PhCs to produces perfect absorption. The number absorption peaks within band...

A simple and compact metal–insulator–metal (MIM) stub coupled with Fabry–Perot (FP) resonator is proposed to realize the plasmonic analogue of electromagnetically induced transparency. By coupling between FP resonator, a narrow transmission peak formed in broad stop-band resonator. combining magnetic field distributions plasmon hybridization theory, physical mechanism presented, which mode splitting caused by evanescent resonators. And effects structure parameters on characteristics system...

We demonstrate the design of an efficient angle-insensitive guided mode resonance filter (GMRF), with narrow bandwidth and low sideband reflection, for TE-polarized waves. The reflection properties multilayer structure have been studied, results verify that thin film gradient-index layer is important realization filter. Various gradient coefficients distinct effects on spectrum. For increasing incident angle, although line-shape symmetry becomes less perfect, positions resonant peak remain...

In order to study the interaction between a femtosecond laser and titanium film, method of combining two-temperature model molecular dynamics was used simulate ablation spallation film by with wavelength 800 nm. The explained from perspective temperature stress wave. It is found that pulse width 300 fs loads threshold around 0.05 J/cm2. effects different widths in range 100–500 energy densities 0.10–0.20 J/cm2 on results films were also studied. We 100 promotes phenomenon occur more quickly....

Controlling the collective behavior of micro/nanomotors with ultrasound may enable new functionality in robotics, medicine, and other engineering disciplines. Currently, various behaviors nanomotors, such as assembly, reconfiguration, disassembly, have been explored by using acoustic fields a fixed frequency, while regulating their varying frequency still remains challenging. In this work, we designed an manipulation methodology that allows nanomotors to exhibit different applied frequency....

By introducing the frequency tuning sensitivity, an analytical model based on equivalent LC circuit is developed for relative range of THz semiconductor split-ring resonator (SRR). And reveals that determined by ratio kinetic inductance to geometric (RKG). The results show under same carrier density variation, a larger RKG in range. Based this model, stacked SRR-dimer structure with compared single SRR due inductive coupling proposed, which improves effectively. obtained simple agree well...

Abstract We propose a strategy to broaden the absorption band of conventional metamaterial absorber by incorporating alternating metal/dielectric films. Up 7-fold increase in bandwidth and ∼95% average are achieved arising from coupling induced multiple gap plasmon resonances. The resonance is analytically demonstrated using coupled oscillator model, which reveals that both optimal strength wavelength matching required for enhancement bandwidth. presented multilayer design easily fabricated...

An electrically-driven terahertz (THz)-wave modulator was numerically designed and experimentally fabricated to realize amplitude modulation of incident THz waves. The wave is composed an array high electron mobility transistors (HEMTs), split-ring resonators (SRRs), metal electrodes. Driven by the time-varying gate voltage, width thickness conducting channel in HEMT changed, resulting variation density two-dimensional gas (2DEG). With 2DEG density, SRR exhibits different transmittance for...

Magnetically powered nanomotors have received increasing attention for decades because of their diverse potential applications. Here, we demonstrate a rod-shaped Au–Ni bimetallic nanomotor that can be by the gradients applied magnetic fields. Efficient and steady control locomotion over Brownian motion is achieved modulating field tailoring length Ni Au segments. The are ideal use as dynamic surface-enhanced Raman scattering (SERS) sensor platform, in average enhancement up to almost one...

Abstract Magnetically powered miniature robots have received increasing attention for decades owing to their convenient navigation ability, noninvasive remote actuation, and diverse potential applications. Although various individual motions of magnetic been explored, mimicking group cooperation synchronized coordination natural intelligence remain challenging. Here, we introduce cooperative behaviors between two swimmers in uniform fields by tuning composing moments. The ability these form...

In this work, the effect of sample temperature on magnesium (Mg) and titanium (Ti) plasmas generated by a Q-switched Neodymium-doped Yttrium Aluminum Garnet (Nd:YAG) laser operating at its fundamental wavelength 1064 nm has been investigated. We observed that increasing significantly enhanced emission intensities plasmas. Comparing peak case 100 °C to 300 °C, we recorded substantial enhancement latter compared former. From these results it can be significant also studied plasma dynamics...

We propose a design strategy to alleviate the tradeoff between wide frequency band and large group index of metamaterial induced slow light. It is realized with structure consisting double bright resonators single dark resonator in each unit cell. Such enables light enhanced bandwidth increased simultaneously than conventional scheme only one resonator. The origin attributed stronger bright-dark coupling steeper dispersion structure. characteristics are analytically demonstrated coupled...

Optically tunable metamaterials provide an ultrafast and active manipulation of terahertz wave. We demonstrate a strategy to alleviate the tradeoff between requirement low optical pump power achievement significant resonance modulation in photoexcited metamaterials. have shown that strength split-ring resonator metamaterial is determined by resistance its silicon gaps. By reducing through geometry adjustment gap region, needed photoconductivity hence can be substantially reduced without...

Abstract In this study, we have spectroscopically investigated the plasma generated by a Q-switched Nd:YAG laser operating at its fundamental wavelength of 1064 nm focused on magnesium (Mg) and titanium (Ti) target samples in air under atmospheric pressure. We employed circular cavities radii (2.5, 3.0, 3.5 mm) square cavity to investigate confinement effect spectral emission intensities plasmas. observed that radius 2.5 mm had maximum signal enhancement, can be attributed compression...

Liquid metal micromotors have attracted mounting interest over the past decade, but their property of sticking to many surfaces has limited controllable manipulation in three dimensions (3-D). In this work, we demonstrate a versatile and generic approach manipulating Gallium-based liquid microfleas (LMMFs) on solid by strategically applied electric (E-) fields, which adhesion LMMFs is greatly reduced tailoring thickness oxide skins metal. Numerical simulations experimental demonstrations...

Magnetically actuated miniature robots have attracted the attention of scientific community over past two decades, but confined workspace their manipulation system (typically a tri-axial coil or eight electromagnetic coils) and low efficiency propulsion limited utility. Here, we describe highly efficient NiFe nanorod-based magnetic swimmer that can be manipulated in 3D spaces using pairs coils placed x–y horizontal plane. In new swimmer, shape symmetry is broken along its body, asymmetry...