Graphene-like two dimensional materials, such as WS2 and MoS2, are highly anisotropic layered compounds that have attracted growing interest from basic research to practical applications. Similar with few-layer has remarkable physical properties. Here, we demonstrate for the first time nanosheets exhibit ultrafast nonlinear saturable absorption property high optical damage threshold. Soliton mode-locking operations achieved separately in an erbium-doped fiber laser using types of WS2-based...

We demonstrate a large enhancement in the interaction of light with graphene through coupling localized modes photonic crystal nanocavity. Spectroscopic studies show that single atomic layer reduces cavity reflection by more than factor one hundred, while also sharply reducing quality factor. The strong allows for cavity-enhanced Raman spectroscopy on subwavelength regions sample. A coupled-mode theory model matches experimental observations and indicates significantly increased absorption...

We report on controlling the spontaneous emission (SE) rate of a molybdenum disulfide (MoS$_2$) monolayer coupled with planar photonic crystal (PPC) nanocavity. Spatially resolved photoluminescence (PL) mapping shows strong variations when MoS$_2$ is PPC cavity, lattice, air gap, and unpatterned gallium phosphide substrate. Polarization dependences cavity-coupled show more than 5 times stronger extracted PL intensity un-coupled emission, which indicates an underlying cavity mode Purcell...

Optically controlled phase shifters are desirable for optical communication, sensors, and signal processing due to their simple implementation low cost. We propose an all-fiber shifter assisted by graphene’s photothermal effect. In a graphene-coated microfiber, ohmic heating promises efficient fiber index change shift via the thermo-optic On fabricated device with length of 5 mm, we obtain exceeding 21π nearly linear slope 0.091  π/mW (0.192  π/mW) when pumped 980 nm (1540 nm) light, which...

Transition-metal dichalcogenides, such as tungsten disulfide (WS2) and molybdenium (MoS2), are highly anisotropic layered materials have attracted growing interest from basic research to practical applications due their exotic physical property that may complement graphene other semiconductor materials. WS2 nanosheets found exhibit broadband nonlinear saturable absorption property, absorbers (SAs) fabricated by depositing on side-polished fibers. Attributing the weak evanescent field long...

van der Waals materials possess an innate layer degree of freedom and thus are excellent candidates for exploring emergent two-dimensional ferroelectricity induced by interlayer translation. However, despite being theoretically predicted, experimental realization this type is scarce at the current stage. Here, we demonstrate robust sliding in semiconducting 1T^{'}-ReS_{2} multilayers via a combined study theory experiment. Room-temperature vertical observed with number N≥2. The electric...

Two-dimensional materials are attractive for constructing high-performance photonic chip-integrated photodetectors because of their remarkable electronic and optical properties dangling-bond-free surfaces. However, the reported two-dimensional material were mainly implemented with configuration metal-semiconductor-metal, suffering from high dark currents low responsivities at operation speed. Here, we report a van der Waals PN heterojunction photodetector, composed p-type black phosphorous...

In-memory computing featuring a radical departure from the von Neumann architecture is promising to substantially reduce energy and time consumption for data-intensive computation. With increasing challenges facing silicon complementary metal-oxide-semiconductor (CMOS) technology, developing in-memory hardware would require different platform deliver significantly enhanced functionalities at material device level. Here, we explore dual-gate two-dimensional ferroelectric field-effect...

Graphene and related two-dimensional materials have attracted great research interests due to prominently optical electrical properties flexibility in integration with versatile photonic structures. Here, we report an in-fiber photoelectric device by wrapping a few-layer graphene bonding pair of electrodes onto tilted fiber Bragg grating (TFBG) for electric-induced thermo-optic conversions. The transmitted spectrum from this consists dense comb narrowband resonances that provides observable...

Abstract Twisted bilayer (TB) transition metal dichalcogenides (TMDCs) beyond TB-graphene are considered an ideal platform for investigating condensed matter physics, due to the moiré superlattices-related peculiar band structures and distinct electronic properties. The growth of large-area high-quality TB-TMDCs with wide twist angles would be significant exploring angle-dependent physics applications, but remains challenging implement. Here, we propose a reconfiguring nucleation chemical...

Abstract Two‐dimensional ultrathin ferroelectrics have attracted much interest due to their potential application in high‐density integration of non‐volatile memory devices. Recently, 2D van der Waals ferroelectric based on interlayer translation has been reported twisted bilayer h ‐BN and transition metal dichalcogenides (TMDs). However, sliding ferroelectricity is not well studied non‐twisted homo‐bilayer TMD grown directly by chemical vapor deposition (CVD). In this paper, for the first...

We demonstrate high-contrast electro-optic modulation of a photonic crystal nanocavity integrated with an electrically gated monolayer graphene. A silicon air-slot provides strong overlap between the resonant optical field and Tuning Fermi energy graphene layer to 0.85 eV enables control its conductivity at telecom wavelengths, which allows cavity reflection in excess 10 dB for swing voltage only 1.5 V. The resonance 1570 nm is found undergo shift wavelength nearly 2 nm, together 3-fold...

Transition metal dichalcogenides, a family of two-dimensional material with unusual electronic, optical, mechanical, and electrochemical properties, have received much research attention in recent years. Here we demonstrate that, another type few-layer transition rhenium disulfide (ReS <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) nanosheets display saturable absorption property at 1.55 μm. By incorporating the ReS polyvinyl alcohol...

Nanoscale and power-efficient electro-optic (EO) modulators are essential components for optical interconnects that beginning to replace electrical wiring intra- interchip communications.1−4 Silicon-based EO show sufficient figures of merits regarding device footprint, speed, power consumption, modulation depth.5−11 However, the weak effect silicon still sets a technical bottleneck these devices, motivating development based on new materials. Graphene, two-dimensional carbon allotrope, has...

Highly efficient absorption of light at telecommunication wavelengths in monolayer graphene is numerically and theoretically investigated a multi-layer photonic configuration, which consists an ultrathin metal film coated on dielectric Bragg mirror sheet silica spacer. Our results show that the absolute single-atomic-layer can significantly reach 80% (34.8-fold enhancement compared to intrinsic value 2.3%), due strong field confinement Tamm plasmon polaritons Moreover, we find efficiency...

We present a kind of harmonic mode locking bound-state solitons in fiber laser based on molybdenum disulfide (MoS(2)) saturable absorber (SA). The locker is fabricated by depositing MoS(2) nanosheets D-shaped (DF). In the laser, two form pulses with temporal separation 3.4 ps, and are equally distributed at repetition rate 125 MHz, corresponding to 14th harmonics fundamental cavity (8.968 MHz). Single- multiple-pulses emissions also observed changing pump power optimizing DF SA. Our...

Abstract van der Waals (vdW) heterojunctions enable arbitrary combinations of different layered semiconductors with unique band structures, offering distinctive engineering for photonic and optoelectronic devices new functionalities superior performance. Here, an interlayer photoresponse a few‐layer MoSe 2 /WSe vdW heterojunction is reported. With proper electrical gating bias, the exhibits high‐sensitivity photodetection operation wavelength extended up to telecommunication (i.e. 1550 nm)....

A novel multilayer photonic structure is proposed to achieve the strong enhancement of light absorption in monolayer molybdenum disulfide (MoS2). Both numerical and analytical results illustrate that absolute this atomically thin layer can approach as high 96% at visible wavelengths due excitation Tamm plasmon mode. It also found operating wavelength height sharp peak are particularly dependent on thicknesses period number dielectric grating, MoS2 position spacer, incident angle light, which...

We investigate the electrically controlled light propagation in metal–dielectric–metal plasmonic waveguide with a sandwiched graphene monolayer. The theoretical and simulation results show that loss exhibits an obvious peak when permittivity of approaches epsilon-near-zero point adjusting gate voltage on graphene. analog electromagnetically induced transparency (EIT) can be generated by introducing side-coupled stubs into waveguide. Based EIT-like effect, hybrid length only 1.5 μm work as...

Graphene's remarkable electrical and optical properties afford great potential for constructing various optoelectronic devices, including modulators, photodetectors pulse lasers. In particular, graphene-based modulators were demonstrated to be featured with a broadband response, small footprint, ultrafast speed CMOS-compatibility, which may provide an alternative architecture light-modulation in integrated photonic circuits. While on-chip graphene have been studied structures, most of them...

The realization of high-<em>Q</em> resonances in a silicon metasurface with various broken-symmetry blocks is reported. Theoretical analysis reveals that the sharp metasurfaces originate from symmetry-protected bound continuum (BIC) and magnetic dipole dominates these peculiar states. A smaller size defect block gives rise to resonance larger <em>Q</em> factor. Importantly, this relationship can be tuned by changing structural parameter, resulting modulation topological configuration BICs....

Abstract In‐sensor computing with visual information, which can integrate photo‐sensing, data storage, and computation functions within the same physical element, has promised a fundamentally different architecture for future machine vision technology extreme energy time efficiency. The elementary devices required to fulfil goal of such new sensory scheme would demand bold functional variation existing sensor processing hardware. Here, van der Waals (vdW) heterostructure‐based optoelectronic...

Abstract Optical materials with centrosymmetry, such as silicon and germanium, are unfortunately absent of second‐order nonlinear optical responses, hindering their developments in efficient devices. Here, a design an array slotted nanocubes is proposed to realize remarkable second harmonic generation (SHG) from the centrosymmetric silicon, which takes advantage enlarged surface nonlinearity, strengthened electric field over air‐slot, well resonance enhancement by bound states continuum....