Hyperbolic media have attracted much attention in the photonics community due to their ability confine light arbitrarily small volumes and potential applications super-resolution technologies. The two-dimensional counterparts of these can be achieved with hyperbolic metasurfaces that support in-plane guided modes upon nanopatterning, which, however, poses notable fabrication challenges limits achievable confinement. We show thin flakes a van der Waals crystal, α-MoO3, naturally polariton at...

Strong light-matter coupling manifested by Rabi splitting has attracted tremendous attention due to its fundamental importance in cavity quantum-electrodynamics research and great potentials quantum information applications. A prerequisite for practical applications of the strong future optoelectronic devices is an all-solid-state system exhibiting room-temperature with active control. Here we realized such a heterostructure consisted monolayer WS2 individual plasmonic gold nanorod. By...

The electrical and photosensitive characteristics of amorphous indium-gallium-zinc-oxide (a-IGZO) thin-film transistors (TFTs) related to the oxygen vacancies V̈ <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">O</sub> are discussed. With filling ratio from 14 8, electron density a-IGZO channel decreases 7.5 3.8 ( ×10 <sup xmlns:xlink="http://www.w3.org/1999/xlink">16</sup> cm xmlns:xlink="http://www.w3.org/1999/xlink">-3</sup> ); saturation...

Plasmon-free surface enhanced Raman scattering (SERS) based on the chemical mechanism (CM) is drawing great attention due to its capability for controllable molecular detection. However, in comparison conventional noble-metal-based SERS technique driven by plasmonic electromagnetic (EM), low sensitivity CM-based dominant barrier toward practical applications. Herein, we demonstrate 1T′ transition metal telluride atomic layers (WTe2 and MoTe2) as ultrasensitive platforms SERS. The...

2D van der Waals (vdW) layered polar crystals sustaining phonon polaritons (PhPs) have opened up new avenues for fundamental research and optoelectronic applications in the mid-infrared to terahertz ranges. To date, vdW with PhPs are only experimentally demonstrated hexagonal boron nitride (hBN) slabs. For active photonic applications, semiconductors tunable charges, finite conductivity, moderate bandgaps preferred. Here, low loss ultrahigh electromagnetic field confinements semiconducting...

Controlling the twist angle between two stacked van der Waals (vdW) crystals is a powerful approach for tuning their electronic and photonic properties. Hyperbolic media have recently attracted much attention due to ability tailor electromagnetic waves at subwavelength-scale which, however, usually requires complex patterning procedures. Here, we demonstrate lithography-free manipulating hyperbolicity by harnessing twist-dependent coupling of phonon polaritons in double-layers vdW α-MoO3,...

Abstract With the increasing demand for terahertz (THz) technology in security inspection, medical imaging, and flexible electronics, there is a significant need stretchable transparent THz electromagnetic interference (EMI) shielding materials. Existing EMI materials, like opaque metals carbon-based films, face challenges achieving both high transparency efficiency (SE). Here, wrinkled structure strategy was proposed to construct ultra-thin, stretchable, MXene which possesses isotropous...

Well‐aligned nanowire arrays of Mo and its oxides have been synthesized. MoO 2 are first synthesized by thermal evaporation in a vacuum chamber. With further treatments the growth chamber, above can be turned into 3 or metallic (see Figure). The field emission properties these nanowires fully investigated.

Aluminum nitride nanostructures are attractive for many promising applications in semiconductor nanotechnology. Herein we report on vapor−solid growth of quasi-aligned aluminum nanocones catalyst-coated wafers via the reactions between AlCl3 vapor and NH3 gas under moderate temperatures around 700 °C, mechanism is briefly discussed. The as-prepared wurtzite grow preferentially along c-axis with adjustable dimensions sharp tips range 20−60 nm. photoluminescence spectrum reveals a broad blue...

Bunches of needle-shaped silicon carbide (SiC) nanowires were grown from commercially available SiC powders in thermal evaporation process and using iron as catalyst. Their structure chemical composition studied by Raman spectroscopy high-resolution transmission electron microscopy. The powder these may be easily dispersed, was used to form samples field emitters. needle shape individual is well-suited emission. Stable emission with current density 30.8 mA/cm2 observed at fields low 9.6...

Straight crystalline copper sulphide (Cu2S) nanowire arrays have been grown by using a simple gas–solid reaction at room temperature. These were demonstrated to exhibit semiconductor properties. Field emission was observed field of ∼6 MV/m, and its current-field characteristics deviate from Fowler–Nordheim theory, i.e., showing nonlinear plot. The uniform the whole transparent anode technique, their variation with applied recorded. individual nanowires also studied microscope, found consist...

Large-scale, uniform, vertically standing graphene with atomically thin edges are controllably synthesized on copper foil using a microwave-plasma chemical vapor deposition system. A growth mechanism for this system is proposed. This film shows excellent field-emission properties, low turn-on field of 1.3 V μm−1, threshold 3.0 μm−1 and large field-enhancement factor more than 10 000.

Boron nanotubes (BNTs) have been theoretically proposed to metallic properties whether they are in armchair or zigzag structure, so attracted much interest from researchers. However, their real not understood until now because hard synthesize. In this paper, we successfully fabricated a large quantity of boron nanotubes, which may provide way master electric and field emission (FE) properties. Study on individual shows that BNTs with an averaged conductivity 40 Ω−1cm−1. Moreover, can sustain...

Due to its difficulty, experimental measurement of field emission from a single-layer graphene has not been reported, although two-dimensional (2D) regime an attractive topic. The open surface and sharp edge are beneficial for electron emission. A 2D geometrical effect, such as massless Dirac fermion, can lead new mechanisms in Here, we report our findings situ characterization on individual singe-layer the understanding related mechanism. edges was done using microanode probe equipped...

A facile all-chemical vapor deposition approach is designed, which allows both sequentially grown Gr and monolayer MoS2 in the same growth process, thus allowing direct construction of MoS2/Gr vertical heterostructures on Au foils. weak n-doping effect an intrinsic bandgap are obtained from MoS2/Gr/Au via scanning tunneling microscopy spectroscopy characterization. The exciton binding energy accurately deduced by combining photoluminescence measurements. As a service to our authors readers,...

Light–matter resonance coupling is a long-studied topic for both fundamental research and photonic optoelectronic applications. Here we investigated the between magnetic dipole mode of dielectric nanosphere 2D excitons in monolayer semiconductor. By coating an individual silicon with WS2, theoretically demonstrated that, because strong energy transfer A-exciton evidenced by anticrossing behavior scattering diagram was observed, splitting 43 meV. In contrast to plexcitons, which involve...

Graphene and its composites are widely investigated as supercapacitor electrodes due to their large specific surface area. However, the severe aggregation disordered alignment of graphene sheets hamper maximum utilization Here we report an optimized structure for electrode, i.e., vertical sheets, which have a open architecture ion transport pathway. The effect morphology orientation on performance is examined using combination model calculation experimental study. Both results consistently...

Transition-metal dichalcogenide (TMD) semiconductors have attracted interest as photoelectrochemical (PEC) electrodes due to their novel band-gap structures, optoelectronic properties, and photocatalytic activities. However, the photo-harvesting efficiency still requires improvement. In this study, A TMD stacked heterojunction structure was adopted further enhance performance of PEC cathode. P-type WSe2 an N-type MoS2 monolayer were layer-by-layer build a ultrathin vertical using...

Steering incident light into specific directions at the nanoscale is very important for future nanophotonics applications of signal transmission and detection. A prerequisite such a purpose development nanostructures with high-efficiency unidirectional scattering properties. Here, from both theoretical experimental sides, we conceived demonstrated visible behaviors heterostructure, Janus dimer composed gold silicon nanospheres. By carefully adjusting sizes spacings two nanospheres, can...

We demonstrated a flexible transparent and free-standing Si nanowire paper (SiNWP) as surface enhanced Raman scattering (SERS) platform for in situ chemical sensing on warping surfaces with high sensitivity. The SERS activity has originated from the three-dimension interconnected network structure electromagnetic coupling between closely separated nanowires SiNWP. In addition, can be highly improved by functionalizing SiNWP plasmonic Au nanoparticles. hybrid substrate not only showed...

Abstract The pursuit of new categories active materials as electrodes supercapacitors remains a great challenge. Herein, for the first time, elemental boron superior electrode material is reported, which exhibits significantly high capacitances and excellent rate performance in all alkaline, neutral, acidic electrolytes. Notably, nanowire‐carbon fiber cloth (BNWs‐CFC) achieve capacitance up to 42.8 mF cm −2 at scan 5 mV s −1 60.2 current density 0.2 mA electrolyte. Moreover, these three...

Abstract One of the main bottlenecks in development terahertz (THz) and long-wave infrared (LWIR) technologies is limited intrinsic response traditional materials. Hyperbolic phonon polaritons (HPhPs) van der Waals semiconductors couple strongly with THz LWIR radiation. However, mismatch photon − polariton momentum makes far-field excitation HPhPs challenging. Here, we propose an In-Plane Polariton Tuner that based on patterning semiconductors, here α-MoO 3 , into ribbon arrays. We...