2D transition metal carbides, nitrides, and carbonitides called MXenes have attracted much attention due to their outstanding properties. However, MXene's potential in laser technology is not explored. It demonstrated here that Ti3 CN, one of MXene compounds, can serve as an excellent mode-locker produce femtosecond pulses from fiber cavities. Stable with a duration short 660 fs are readily obtained at repetition rate 15.4 MHz wavelength 1557 nm. Density functional theory calculations show...

Mono‐ and few‐layer transition metal dichalcogenides (TMDCs) have been widely used as saturable absorbers for ultrashort laser pulse generation, but their preparation is complicated requires much expertise. The possible use of bulk‐structured TMDCs therefore a very intriguing technically important issue in technology. Here, the first time, it demonstrated that defective, WTe 2 microflakes can serve base absorption material fast mode‐lockers produce femtosecond pulses from fiber cavities....

Tungsten ditelluride (WTe2) is a layered material that exhibits excellent magnetoresistance and thermoelectric behaviors, which are deeply related with its distorted orthorhombic phase may critically affect the lattice dynamics of this material. Here, we report comprehensive characterization Raman spectra WTe2 from bulk to monolayer using experimental computational methods. We find mono bi-layer easily identified by spectroscopy since two or one modes observed in higher-layer greatly...

Abstract Saturable absorbers (SAs) are materials that can generate ultrashort pulse lasers via mode locking due to optical absorption nonlinearity. Recently, layered 2D have gained increasing attention as next‐generation SAs. Layered transition‐metal monochalcogenides (TMMCs) provide the source for a large family of with broad chemical composition while exhibiting superior structural features SA, but far it is known, none these studied SA applications date. Here, first time, nonlinear...

Abstract Metallic 2D materials can be promising saturable absorbers for ultrashort pulsed laser production in the long wavelength regime. However, preparing and manipulating their structures without layer stacking have been nontrivial. Using a combined experimental theoretical approach, we demonstrate here that metallic titanium carbide (Ti 3 C 2 T x ), most popular MXene material, excellent nonlinear absorption properties even highly stacked state due to its intrinsically existing surface...

Abstract Monolayer MoS 2 (1L-MoS ) has photoluminescence (PL) properties that can greatly vary via transition between neutral and charged exciton PLs depending on carrier density. Here, for the first time, we present a chemical doping method reversible excitons of 1L-MoS using chlorine-hydrogen-based plasma functionalization. The PL is drastically increased by p-type chlorine in which its intensity easily tuned controlling treatment duration. We find despite their strong adhesion, post...

We performed density functional theory calculations for the topological insulators (TIs) of Bi <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Se xmlns:xlink="http://www.w3.org/1999/xlink">3 </sub> and CoSb xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> (skutterudite) in a comparison with Te In Co xmlns:xlink="http://www.w3.org/1999/xlink">4 Sb xmlns:xlink="http://www.w3.org/1999/xlink">12</sub> (filled skutterudite) to explore...

Recently, evidence was presented that certain single-walled carbon nanotubes (SWNTs) possess helical defective traces, exhibiting distinct cleaved lines, yet their mechanical characterization remains a challenge. On the basis of spiral growth model SWNTs, here we present atomic details defects and investigate how tensile behaviors SWNTs change with presence using molecular dynamics simulations. have exhibited substantially lower strength strain than theoretical results obtained from seamless...

Filled skutterudites (FSs), which are known to be good thermoelectric materials, have been intensively investigated in the field of condensed matter physics past decades, due their large variety electronic and magnetic properties. However, best authors' knowledge, there has no previous investigation optical properties FSs. The nonlinear saturable absorption property FSs is this work for first time, results reported here. More specifically, Co 4 Sb 12 chosen as a binary skutterudite system,...

Monolayer transition‐metal dichalcogenides (TMDCs) have recently emerged as promising candidates for advanced photonic and valleytronic applications due to their unique optoelectronic properties. However, the low luminescence efficiency of monolayer TMDCs has significantly hampered use in these fields. Here it is reported that photoluminescence WS 2 can be remarkably enhanced up fourfold through fluorination, surpassing performance molecular and/or electrical doping methods. Its degree...

Abstract Recently, two-dimension transition metal carbides, carbonitrides, and nitrides called MXenes have attracted huge attention due to their outstanding physical properties in various fields. Here we highlight the enormous potential of as nonlinear optical materials laser technologies, which includes ultrafast pulse generation, frequency modulation based on four-wave mixing, photonic diodes with time reversal symmetry breaking. Emphasis is placed wide spectral applicability metallic...

We report the first investigation results of nonlinear optical properties As2Te3. More specifically, absorption prepared α-As2Te3 were investigated at wavelengths 1.56 and 1.9 μm using open-aperture (OA) Z-scan technique. Using OA technique, coefficients (β) estimated in a range from (- 54.8 ± 3.4) × 104 cm/GW to 4.9 0.4) depending on irradiance input beam μm, whereas values did 19.8 0.8) 3.2 0.1) μm. In particular, β value is an order magnitude larger than previously reported other group-15...

Molecular dynamics simulations were performed to investigate how the orientation of grain boundary (GB) affects tensile mechanics polycrystalline graphene, where two opposite GB groups, i.e., armchair (AC) and zigzag (ZZ)-oriented tilted GBs considered for anisotropic study. We found very close mechanical similarities between groups in misorientation angle effect critical bond length determine strength. Mono-atomic carbon chains (MACCs) commonly generated at failure both as bridged fractured...

We investigate the thermal properties of mono-, bi- and tri-layer MoTe2 by using temperature-dependent Raman spectroscopy ranging from 90 K to 300 K. The E2g1 B2g1 modes blueshift as temperature decreases. dependence peak positions obtained mono- is analyzed Grüneisen model. first order coefficients are extracted. This study provides fundamental information about layers, which crucial for developing electronic applications based devices.

Two-dimensional (2D) materials have exceptional mechanical properties that are absent in conventional bulk due to their ultra-thin structure with ultra-high surface-to-volume ratio. Despite great potential both for basic research and applications, however, deep understanding of fundamentally important orientation-dependent responses 2D rarely been achieved. In this work, the first time, we investigate tensile response transition-metal carbides (MXenes) as gradually varying direction by using...

This review summarizes recent advances in the photonics of two-dimension transition metal carbides referred as MXenes. MXenes show outstanding nonlinear optical absorption and can serve excellent mode-lockers to produce ultrafast pulse lasers at broad range from visible mid-infrared regions. Particularly, metallic have great advantages for long-wavelength applications 3000-nm mode-locked free-space are readily fabricated using MXene-deposited saturable absorber mirrors. also significant...