Functional Porous MOF-Derived CuO Octahedra for Harmonic Soliton Molecule Pulses Generation

Abstract

Metal−organic frameworks (MOF) or their derivatives have attracted much attention in recent years due to exciting properties such as high specific surface area, adjustable pore size, and easy functionalization, which makes them have unique advantages in the fields of catalysis, energy storage, optoelectronics, and so on. However, the study of them in the fields of nonlinear optics and ultrafast photonics is still in its early stage. Here, by annealing the MOF template, porous MOF-derived CuO octahedra are prepared and applied to the above fields. Experiments show that CuO octahedra possess an excellent nonlinear optical absorption capacity in the near-infrared band. When it is used as a saturable absorber (SA) to the fiber lasers, high order harmonic soliton molecules with a repetition frequency up to 238 MHz can be obtained that make sense for optical frequency combs and optical communication. Besides, the dynamic evolution of the harmonic soliton molecule is explored. This work pioneers the application of MOF-derived metal oxide polyhedra as SAs in fiber lasers and expands the application fields of MOF-based materials. Moreover, this kind of emerging microstructured polyhedral SA, prepared by the new method, provides researchers with a new choice beyond quantum dots, nanoparticles, and 2D nanosheets/nanofilms.

Spectral imaging and spectral LIDAR systems: moving toward compact nanophotonics-based sensing

“…There are a lot of recent research works and progress in ultrafast photonics, nonlinear optics and optical soliton generation [128][129][130][131][132][133][134][135][136][137]. The optical frequency comb, which leverages on the nonlinear optical effects (e.g., Kerr effect and self-phase modulation), has also drawn a lot of attention.…”

Ti3C2Tx MXene Quantum Dots with Surface-Terminated Groups (-F, -OH, =O, -Cl) for Ultrafast Photonics

“…Unfortunately, its low absorption coefficient and low damage threshold constrained graphene from developing in this field [11]. Therefore, many researchers began to shift focus on other low-dimensional materials, such as single-walled carbon nanotubes (SWCNTs) [12], black phosphorus (BP) [13,14], transition metal dichalcogenides (TMDs) [15][16][17], topological insulators (TIs) [18,19], perovskite [20,21], metal-organic frameworks (MOFs) [22][23][24], transition metal carbides and nitrides (MXenes) [25][26][27], and various quantum dots (QDs) [28][29][30][31]. However, there are still many bottlenecks, such as nontunable bandgap, unstable structures, or unstable optical modulation performance.…”

Third‐Order Nonlinear Optical Response of Few‐Layer MXene Nb2C and Applications for Square‐Wave Laser Pulse Generation

“…Especially, the low dimensions and distinctive nonlinear optical properties make them strongly meet the ever‐increasing demand and widely used in high efficiency, compactness, broadband optoelectronic and photonic devices, broadband all‐optical modulator, optical frequency conversion, pulsed laser generation, surface plasmonic, and so on. [ 12–19 ] However, there are still some disadvantages for the current 2D materials. For example, the gapless band structure and relative low light absorption of graphene limit its extensive applications; [ 20,21 ] the band gap of TMDs (1.0–2.0 eV) indicates they cannot be available in mid‐infrared wavelength range; [ 22,23 ] and easy oxidation is the biggest obstacle for practical applications of BP.…”