Abstract
Abstract Two-dimensional (2D) mono-elemental materials (Xenes) show remarkable potential in the fields of fundamental science and technology, have been regarded as a wide range of building blocks for electronic technologies due to their unique chemical, physical, electrical, and optical properties. Here, 2D tellurene/black phosphorus (Te/BP) heterojunctions are successfully fabricated through liquid-phase exfoliation (LPE) method. Their nonlinear optical absorption properties at 1.0, 2.0, and 2.8 μm have been studied by an open-aperture Z-scan method. The results revealed the excellent broadband saturable absorption responses of the prepared BP/Te heterojunctions, which are further confirmed by using them as saturable absorbers (SAs) for passively Q-switched all-solid-state lasers operating at 1.0, 2.0, and 2.8 μm, respectively. In particular, 1.04 μm continuous-wave (CW) mode-locked lasers with a pulse width of 404 fs is realized for the first time, to our best knowledge. Our work indicates that 2D Xenes especially 2D Xenes based heterojunctions have great potential in the fields of pulsed laser generation/modulation and other optoelectronic and photonic devices.
Highlights
In the past decades, encouraged by the significant success of graphene [1,2,3], two-dimensional (2D) materials have evoked tremendous interest because of their exotic properties caused by the ultrathin 2D structure
Our work indicates that 2D Xenes especially 2D Xenes based heterojunctions have great potential in the fields of pulsed laser generation/modulation and other optoelectronic and photonic devices
The results indicating the excellent saturable absorption response of the 2D tellurene/black phosphorus (Te/BP) heterojunction nanosheets, which is further confirmed by using as the saturable absorbers (SAs) for broadband passively Q-switched (PQS) lasers operating at 1.0, 2.0, and 2.8 μm, respectively
Summary
In the past decades, encouraged by the significant success of graphene [1,2,3], two-dimensional (2D) materials have evoked tremendous interest because of their exotic properties (electronic, photonic, magnetic, and catalytic, etc.) caused by the ultrathin 2D structure. B. Yan et al.: 2D tellurene/black phosphorus heterojunctions studied 2D Xene after graphene due to the fascinating properties, such as layer-dependent direct bandgap (∼0.3– 2.0 eV), in-plane anisotropy, large room-temperature hole mobility (>103 cm2/V/s), and self-biodegradation [28]. Yan et al.: 2D tellurene/black phosphorus heterojunctions studied 2D Xene after graphene due to the fascinating properties, such as layer-dependent direct bandgap (∼0.3– 2.0 eV), in-plane anisotropy, large room-temperature hole mobility (>103 cm2/V/s), and self-biodegradation [28] These outstanding properties makes BP to be promising for scientific research and development of electronic, optoelectronic and bio-medicine devices. Our work paves a new way of 2D Xenes especially 2D Xenes based heterojunctions in the applications of pulsed laser generation/modulation and other optoelectronic devices
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