THz surface emission from bulk and monolayer WSe2

Khusyainov, D. I.; Gorbatova, A. V.; Buryakov, A. M.; Мишина, Е. Д.

doi:10.1063/5.0055455

Cited by 2 publications

(1 citation statement)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The total THz electric field, therefore, can be given by the relation, E THz ∝ ∂ 2 P/∂t 2 + ∂J/∂t, where P is nonlinear polarization and J is photocurrent density induced in the medium by the excitation pulse. The above expression is valid in both the bulk and the monolayer cases, however, the contributory effect from each term may vary from one to the other [21,36]. To distinguish and quantify the role of each contribution in a particular material, THz emission measurements under different conditions [37,38] of the incident pump fluence, pump polarization angle, and sample azimuthal angle, are necessarily to be done.…”

Section: Introductionmentioning

confidence: 99%

An interplay between optical rectification and transient photocurrent effect on THz pulse generation from bulk MoS₂ layered crystal

Dhakar

Kumar

Nivedan

et al. 2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Development of novel schemes for efficient terahertz (THz) generation from transition metal dichalcogenides (TMDs) are useful for realizing integrated THz devices based on them and also, understanding of the related fundamental processes from such studies will guide to suitable designs. Here, we report the THz emission efficiency of bulk MoS2 layered crystal at varying femtosecond excitation wavelengths, from 550 nm to the telecommunication wavelength of 1550 nm. By using both the below bandgap excitation at longer wavelengths and the above bandgap excitation at shorter wavelengths, we resolve THz emission contributions from resonant and non-resonant optical rectification processes, and the surface field induced transient photocurrent effect (TPE). A relatively much larger contribution to THz emission from the TPE than the resonant optical rectification is measured for the above bandgap excitation. We have measured a clear difference between the resonant and nonresonant optical rectification processes. The pure optical rectification part is exclusively determined from detailed experiments using excitation intensity, polarization angle, and azimuthal angle dependent measurements. For the above bandgap excitation, the THz emission gets highly saturated with the increasing excitation intensity. Also, the value of the saturation intensity increases (decreases) with the excitation photon energy (wavelength). Interestingly, we find that the linear polarization angle and the azimuthal angle dependent THz signal due to resonant optical rectification is π/2 phase offset relative to that due to the nonresonant optical rectification.

show abstract

Section: Introductionmentioning

confidence: 99%

An interplay between optical rectification and transient photocurrent effect on THz pulse generation from bulk MoS₂ layered crystal

Dhakar

Kumar

Nivedan

et al. 2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

show abstract

Increasing the Efficiency of a Spintronic THz Emitter Based on WSe2/FeCo

et al. 2021

View full text Add to dashboard Cite

We report an increase in terahertz (THz) radiation efficiency due to FeCo/WSe2 structures in the reflection geometry. This can be attributed to an absorption increase in the alloy FeCo layer at the input FeCo/WSe2 interface due to constructive interference, as well as to the backward transport of hot carriers from FeCo to WSe2. In contrast to the transmission geometry, the THz generation efficiency in the reflection is much less dependent on the magnetic layer thickness. Our results suggest a cheap and efficient way to improve the characteristics of THz spintronic emitters with the conservation of a full set of their important properties.

show abstract

THz surface emission from bulk and monolayer WSe2

Cited by 2 publications

References 14 publications

An interplay between optical rectification and transient photocurrent effect on THz pulse generation from bulk MoS₂ layered crystal

An interplay between optical rectification and transient photocurrent effect on THz pulse generation from bulk MoS₂ layered crystal

Increasing the Efficiency of a Spintronic THz Emitter Based on WSe2/FeCo

Contact Info

Product

Resources

About

THz surface emission from bulk and monolayer WSe2

Cited by 2 publications

References 14 publications

An interplay between optical rectification and transient photocurrent effect on THz pulse generation from bulk MoS2 layered crystal

An interplay between optical rectification and transient photocurrent effect on THz pulse generation from bulk MoS2 layered crystal

Increasing the Efficiency of a Spintronic THz Emitter Based on WSe2/FeCo

Contact Info

Product

Resources

About

An interplay between optical rectification and transient photocurrent effect on THz pulse generation from bulk MoS₂ layered crystal

An interplay between optical rectification and transient photocurrent effect on THz pulse generation from bulk MoS₂ layered crystal