MXenes, a new family of two-dimensional materials, were prepared by a selective chemical etching method and the saturation absorption characteristics were measured using the Z-scan method. At 1.06 μm, a passively Q-switched Nd:YAG ceramic laser was operated by using MXene Ti3C2T x as a saturable absorber successfully for the first time. At an absorbed pump power of 4.14 W, the pulse repetition rate was 186 kHz and the minimum pulse width was 359 ns. The maximal peak power and single-pulse energy were 2.04 W and 0.66 μJ respectively. This study demonstrates that MXenes show promise as saturable absorbers in laser technology.
We experimentally investigated the broadband nonlinear optical response of highly stable few-layer antimonene (FLA) by performing a Z-scan laser measurement. FLA was deposited into the microfiber as a FLA-decorated microfiber, which is feasible not only for all-optical thresholding, but also for wavelength converting in optical signal processing.
Abstract Since the successful fabrication of two-dimensional (2D) tellurium (Te) in 2017, its fascinating properties including a thickness dependence bandgap, environmental stability, piezoelectric effect, high carrier mobility, and photoresponse among others show great potential for various applications. These include photodetectors, field-effect transistors, piezoelectric devices, modulators, and energy harvesting devices. However, as a new member of the 2D material family, much less known is about 2D Te compared to other 2D materials. Motivated by this lack of knowledge, we review the recent progress of research into 2D Te nanoflakes. Firstly, we introduce the background and motivation of this review. Then, the crystal structures and synthesis methods are presented, followed by an introduction to their physical properties and applications. Finally, the challenges and further development directions are summarized. We believe that milestone investigations of 2D Te nanoflakes will emerge soon, which will bring about great industrial revelations in 2D materials-based nanodevice commercialization.
Black phosphorus (BP), as a typical layered two-dimensional (2D) material, has attracted tremendous attention due to its high carrier mobility, unique in-plane anisotropic structure and tunable direct bandgap.
Abstract Investigations into 2D nanomaterials are of considerable significance from both an academic and industrial point of view. The present work addresses, for the first time, the fabrication of 2D nonlayered ultrathin selenium through a facile liquid‐phase exfoliation method. The results reveal that the as‐prepared 2D Se nanosheets are 40–120 nm in lateral dimension and 3–6 nm in thickness. The nanosheets exhibit a trigonal crystalline phase similar to their bulk counterpart, indicating the conservation of the crystalline features during the exfoliation procedure. The successful preparation of 2D Se nanosheets from nonlayered bulk Se can be ascribed to two kinds of anisotropy: (1) that of crystalline bulk Se with chain‐like structures, where strong intrachain SeSe covalent bonds coexist with weak interchain van der Waals forces, and (2) that of probe sonication in the vertical direction. The results also show that the 2D Se nanosheets possess a size‐dependent band gap ( E g ), strong photoluminescence effect and robust, chemical stability under ambient conditions. Furthermore, a 2D Se‐nanosheet‐based optical modulation device is demonstrated that allows for excellent ultrashort pulse generation of an optical communication band. It is therefore anticipated that 2D Se nanosheets may find significant applications in both photoluminescence and ultrafast photonics.
Abstract Exploration of ultrastable 2D material‐based optical devices toward all‐optical signal processing is attracting rising interest. As a Group‐VA monoelemental 2D material, antimonene is becoming a promising nonlinear optical material owing to its outstanding optoelectronic advantages with long‐term stability. Herein, all‐optical signal processing based on the high optical nonlinearity of antimonene is first demonstrated. Few‐layer antimonene is fabricated and decorated on the microfiber as an optical device. The device can be applied as an all‐optical Kerr switcher with an extinction ratio as high as ≈12 dB and wavelength conversion of modulated high‐speed signals at a frequency up to 18 GHz. The findings indicate that such a few‐layer antimonene‐based photonics device is applicable in nonlinear optics, which can be potentially developed for the applications of next‐generation high‐speed optical communication.
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