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14 papers
Unraveling Intertwined Impacts between Lattice Vacancy and Substrate on Photonic Quasiparticles in Monolayer MoS
Ning Xu, Daocheng Hong, Xudong Pei +6
Lattice defects and interfacial absorbates represent two extrinsic but ubiquitous factors that exert profound impacts on the luminescent properties of semiconductors. However, thei…
Controlling relaxation dynamics of excitonic states in monolayer transition metal dichalcogenides WS2 through interface engineering
Anran Wang, Yuhan Wang, Jianfei Li +5
Transition metal dichalcogenides (TMDs) are known to support complex excitonic states. Revealing the differences in relaxation dynamics among different excitonic species and elucid…
1550 nm compatible ultrafast photoconductive material based on a GaAs/ErAs/GaAs heterostructure
Kedong Zhang, Yiwen Li, Yifeng Ren +8
The sub-bandgap absorption and ultrafast relaxation in a GaAs/ErAs/GaAs heterostructure are reported. The infrared absorption and 1550 nm-excited ultrafast photo-response are studi…
Anisotropic ultrafast spin/valley dynamics in WTe2 films
Yequan Chen, Zhendong Chen, Yongda Chen +16
WTe2 Weyl semimetal hosts the natural broken inversion symmetry and strong spin orbit coupling, making it promising for exotic spin/valley dynamics within a picosecond timescale. H…
Ultrafast photocarrier recombination dynamics in black phosphorus-molybdenum disulfide (BP/MoS2) heterostructure
Zhonghui Nie, Yuhan Wang, Ziling Li +8
Van der Waals (vdW) heterostructures constructed with two-dimensional (2D) materials have attracted great interests, due to their fascinating properties and potential for novel app…
A light-stimulated neuromorphic device based on graphene hybrid phototransistor
Shuchao Qin, Fengqiu Wang, Yujie Liu +6
Neuromorphic chip refers to an unconventional computing architecture that is modelled on biological brains. It is ideally suited for processing sensory data for intelligence comput…
A High-Performance Mid-infrared Optical Switch Enabled by Bulk Dirac Fermions in Cd3As2
Chunhui Zhu, Fengqiu Wang, Yafei Meng +11
Pulsed lasers operating in the 2-5 μm band are important for a wide range of applications in sensing, spectroscopy, imaging and communications. Despite recent advances with mid-inf…
Planar carbon nanotube-graphene hybrid films for high-performance broadband photodetectors
Yuanda Liu, Fengqiu Wang, Xiaomu Wang +8
Graphene has emerged as a promising material for photonic applications fuelled by its superior electronic and optical properties. However, the photoresponsivity is limited by the l…
Stable gain-switched thulium fiber laser with 140 nm tuning range
Fengqiu Wang, Yafei Meng, Edmund Kelleher +4
We demonstrate a gain-switched thulium fiber laser that can be continuously tuned over 140 nm, while maintaining stable nanosecond single-pulse operation. To the best of our knowle…
Tm-doped fiber laser mode-locked by graphene-polymer composite
M. Zhang, E. J. R. Kelleher, F. Torrisi +7
We demonstrate mode-locking of a thulium-doped fiber laser operating at 1.94μm, using a graphene-based saturable absorber. The laser outputs 3.6ps pulses, with~0.4nJ energy and an…
Graphene Q-switched, tunable fiber laser
D. Popa, Z. Sun, T. Hasan +3
We demonstrate a wideband-tunable Q-switched fiber laser exploiting a graphene saturable absorber. We get ~2us pulses, tunable between 1522 and 1555nm with up to~40nJ energy. This…
Sub 200fs pulse generation from a graphene mode-locked fiber laser
D. Popa, Z. Sun, F. Torrisi +3
Ultrafast fiber lasers with short pulses and broad bandwidth are in great demand for a variety of applications, such as spectroscopy, biomedical diagnosis and optical communication…
Wideband tunable, graphene-mode locked, ultrafast laser
Z. Sun, D. Popa, T. Hasan +5
We report a tunable ultrafast fiber laser mode-locked with a graphene saturable absorber. The linear dispersions of the Dirac electrons in graphene enable wideband tunability. We g…
Graphene Mode-Locked Ultrafast Laser
Z. Sun, T. Hasan, F. Torrisi +6
Graphene is at the center of a significant research effort. Near-ballistic transport at room temperature and high mobility make it a potential material for nanoelectronics. Its ele…