Polarization-dependent ultrafast carrier dynamics in GaAs with anisotropic response

Li, Yachao; Ge, Chao; Wang, Peng; Liu, Shuang; Ma, Xiaoran; Wang, Bing; Song, Haiying; Liu, Shibing

doi:10.1088/1674-1056/ac422b

Cited by 3 publications

(3 citation statements)

References 45 publications

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“…[19] Therefore, the intraband absorption of nonequilibrium carrier induces a negative ∆T signal. The resolution-limited enhancement of ∆T signal before 0 delay is caused by the carrier thermalization via carrier-carrier scattering and carrier-phonon scattering, [28] which rapidly expands the photoexcited carriers from the highenergy state toward the bottoms of energy bands, and es-tablishing a quasi-equilibrium distribution for the formed hot carriers. [29] To analyze the subsequent relaxation process, the time-resolved curves are fit to a bi-exponential function as follows:…”

Section: Resultsmentioning

confidence: 99%

Thickness-dependent exciton relaxation dynamics of few-layer rhenium diselenide

Huo¹,

Yun²,

Yan³

et al. 2023

Chinese Phys. B

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Rhenium diselenide (ReSe2) has gathered much attention due to its low symmetry of lattice structure, which makes it possess in-plane anisotropic optical, electrical as well as excitonic properties and further enables ReSe2 have an important application in optoelectronic devices. Here, we report the thickness-dependent exciton relaxation dynamics of mechanically exfoliated few-layer ReSe2 flakes by using time-resolved pump–probe transient transmission spectroscopies. The results reveal two thickness-dependent relaxation processes of the excitons. The fast one correlates with the exciton formation (i.e., the conversion of hot carriers to excitons), while the slow one is attributed to the exciton recombination dominated by defect-assisted exciton trapping besides photon emission channel. The decrease of scattering probability caused by defects leads to the increase of fast lifetime with thickness, and the increase of slow lifetime with thickness is related to the trap-mediated exciton depopulation induced by surface defects. Polarization dependent transient spectroscopy indicates the isotropic exciton dynamics in the 2D plane. These results are insightful for better understanding of excitonic dynamics of ReSe2 materials and its application in future optoelectronic and electronic devices.

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Section: Resultsmentioning

confidence: 99%

Thickness-dependent exciton relaxation dynamics of few-layer rhenium diselenide

Huo¹,

Yun²,

Yan³

et al. 2023

Chinese Phys. B

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“…The polarization of photons is closely related to the anisotropic crystals with periodic structure and long-range order, delivering variable properties responding to the light with different vibration direction [3,4] . The optical anisotropy of the carrier transition and relaxation process in the crystal is essentially the result of the anisotropy of the interaction between the quasi-particles and the incident light electromagnetic field [5] . It is generally believed that the powder morphology of crystal materials is of little significance for the detection of laser polarization due to its random orientation distribution [6] .…”

Section: Introductionmentioning

confidence: 99%

Analysis of ground state and excited state of powder according to laser polarization response

Li,

Song,

et al. 2023

3rd International Conference on Laser, Optics, and Optoelectronic Technology (LOPET 2023)

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The ineffectiveness of powder morphology of crystal materials for laser polarization has reached a consensus in almost all steady-state experiments. However, in-depth understanding about their anisotropic behavior in ultrafast carrier dynamics is still lacking. Here we systematically explore the polarization response of MAPbI 3 powder to ultrafast laser based on two-color pump-probe transmission technology. The isotropy of pump polarization and the anisotropy of probe polarization reveal the related mechanism of the interaction between ultrafast laser polarization and powder materials. It provides insight into the ultrafast photophysical process of MAPbI 3 powder and helps to develop polarization-sensitive and ultrafast-responsive optoelectronic devices.

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“…Therefore, it has a wide range of applica-tions in laser beam shaping, saturable absorbers, mode-locking and ultrafast photonics in the nonlinear domain. [21][22][23] The NLO properties of three tungsten trioxide (WO 3 ) nanostructures (nanowires, nanoplates, and nanoclusters) were investigated via the open-aperture Z-scan method under nanosecond laser pulses at 532 nm. These nanostructures also exhibited an intensity-dependent transition from SA to reverse saturable absorption (RSA) with increasing laser intensity.…”

Section: Introductionmentioning

confidence: 99%

Giant saturation absorption of tungsten trioxide film prepared based on the seedless layer hydrothermal method

Chen

et al. 2023

Chinese Phys. B

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Nonlinear materials have gained wide interest as saturable absorbers and pulse compression for pulsed laser applications due to their unique optical properties. This work investigates the third-order nonlinear phenomenon of tungsten trioxide (WO3) thin films. The giant nonlinear absorption and nonlinear refractive index of WO3 thin films are characterized by Z-scan method at 800 nm. We experimentally observed the giant saturable absorption (SA) and nonlinear refractive index of WO3 thin films prepared by the seedless layer hydrothermal method, with SA coefficient being as high as -2.59×105 cm GW-1. The SA coefficient is at least one order of magnitude larger than those of the conventional semiconductors. The nonlinear refractive index n2 of WO3 film has been observed for the first time in recent studies and the corresponding coefficient can be up to 1.793 cm2 GW-1. The large third-order nonlinear optical (NLO) response enables WO3 thin films to be promising candidates for optoelectronic and photonic applications in the near-infrared domain.

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Polarization-dependent ultrafast carrier dynamics in GaAs with anisotropic response

Cited by 3 publications

References 45 publications

Thickness-dependent exciton relaxation dynamics of few-layer rhenium diselenide

Thickness-dependent exciton relaxation dynamics of few-layer rhenium diselenide

Analysis of ground state and excited state of powder according to laser polarization response

Giant saturation absorption of tungsten trioxide film prepared based on the seedless layer hydrothermal method

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