Strong interlayer coupling mediated giant two-photon absorption in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>MoS</mml:mi><mml:msub><mml:mi mathvariant="normal">e</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>/graphene oxide heterostructure: Quenching of exciton bands

Sharma, Rituraj; Aneesh, J.; Yadav, Rajesh K.; Sanda, Suresh; Barik, A. R.; Mishra, A. K.; Maji, Tuhin Kumar; Karmakar, Debjani; Adarsh, K. V.

doi:10.1103/physrevb.93.155433

Cited by 62 publications

(16 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Where T p and T np are the wavelengths (l) dependent transmission signal at the different pump-probe delay (t) in the presence (p) and absence (np) of the pump laser, respectively. For each examined λ, the dynamics follow exponential decay or rise, thus the decay transients can be fitted as follows (Eq 4): [37] DTðl; tÞ T ¼…”

Section: Resultsmentioning

confidence: 99%

Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Sinha

Višić

Byregowda

et al. 2022

Israel Journal of Chemistry

View full text Add to dashboard Cite

Semiconducting transition metal dichalcogenides can be synthesized in a wide range of structures and geometries, including closed cage nanostructures, such as nanotubes or fullerene‐like nanoparticles (NSs). The latter is especially intriguing due to the stability, enhanced light‐matter interactions, and ability to sustain exciton‐polaritons (EPs) in ambient conditions, i. e., strong coupling of excitonic resonances to the optical cavity. Here we investigate the dynamics of EPs formation in WS2 NPs in the time domain using femtosecond transient extinction spectroscopy. We develop a gamut of analytical methods and models with time‐dependent parameters to extract the underlying non‐equilibrium dynamics of EPs formation. We find that the formation of EPs in WS2 NPs is not instantaneous but a gradual process that occurs only after several picoseconds. Specifically, for the short delay times, the light‐matter interaction is guided by excitonic absorption, whereas for the long delay times, the process is controlled by polaritonic scattering. We discover that the coupling strength is a time‐dependent entity and not a constant as is usually defined. Namely, there is a nonlinear coupling between excitonic and external modes and a notable transition from weak to strong coupling limit. Our results show that the time‐dependent phenomenological dynamical model quantitatively reproduces the nonlinear dynamical coupling as well as the effects of the pump fluence on the coupling strength.

show abstract

Section: Resultsmentioning

confidence: 99%

Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Sinha

Višić

Byregowda

et al. 2022

Israel Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…high nonlinear absorption (β) and high nonlinear refractive index (n2) remains a central research question over many years. A wide range of amorphous and crystalline materials, for example, porphyrin [9], ZnO nanorods [10], plasmonic materials [11], nanocomposites of transition metal dichalcogenides [12], graphene oxide [4,13] etc. have shown their applicability to some extent in optical limiting.…”

Section: Introductionmentioning

confidence: 99%

Near resonant nanosecond laser-driven nonlinear optical response in As₅₀S₅₀ thin films

Mandal

Khan

Adarsh

2020

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

Nanosecond near resonant excitation in As50S50 thin films leads to strong nonlinear optical response, i.e. nonlinear absorption coefficient up to 4 × 10 6 cm/GW and nonlinear refractive index of 8.5 cm 2 /GW, both of which is the strongest ever reported in amorphous semiconductors. We propose a five-level energy model to explain such effect which indicates that nonlinear process is reverse saturable absorption in nature, mediated by excited state absorption from triplet-triplet transition. On the other hand, observation of negative nonlinear refractive index reveals the occurrence of self-defocusing effect. Finally, benefitting from the strong nonlinear response, we demonstrate a promising application of As50S50 thin films as an optical limiter for optoelectronic sensors.

show abstract

“…The charge transfer properties offer opportunities for optoelectronic device applications, e.g., n‐type doping in MoS 2 by coupling with a charge transfer complex of aromatic benzyl viologen . Similarly, the donor–acceptor charge transfer between MoSe 2 and graphene oxide has been shown to enhance the nonlinear absorption by as much as 30 times . By contrast, doping of MoS 2 with rare‐earth (RE) ions may enhance absorption and emission of near‐IR photons, in which the energy transfer may be mediated through the intrinsic defect states of MoS 2 films.…”

Section: Introductionmentioning

confidence: 99%

Structural, Spectroscopic, and Excitonic Dynamic Characterization in Atomically Thin Yb³⁺‐Doped MoS₂, Fabricated by Femtosecond Pulsed Laser Deposition

Maddi

Aswin

Scott

et al. 2019

Advanced Optical Materials

View full text Add to dashboard Cite

The large area deposition and synthesis of 10 mm × 10 mm atomically thin Yb3+‐doped MoS2 films by femtosecond pulsed laser deposition on a silica glass optical platform for device applications are demonstrated for the first time. The presence of Yb3+‐ion doping is confirmed using photoluminescence (PL), X‐ray photoelectron spectroscopy (XPS), and Raman spectroscopy. The Yb3+‐doped MoS2 films, when excited with a 976 nm laser, exhibit room temperature PL with a peak at 1002 nm. The XPS and Raman spectroscopic analyses of the Yb3+‐doped and undoped films show that the deposited films are a mixture of 2H‐ and 1T‐MoS2 after postdeposition annealing at 500 °C. The density functional theory analysis shows that the 1T phase is metastable by +77 kJ (≈0.8 eV) mol‐1, when compared with the 2H state at 0 K. Ultrafast transient nonlinear optical spectroscopic measurements prove that the saturable absorption of undoped MoS2 is significantly modified after Yb3+‐ion doping, by displaying dopant‐host structure charge transfer. The complex transient absorption line shape shows a combination of bleach (negative) signals at the A (670 nm) and B (630 nm) exciton energies, and a strong induced absorption below the A exciton level. The results presented herein provide critical insight in designing novel rare‐earth‐ion doped 2D materials and devices.

show abstract

Strong interlayer coupling mediated giant two-photon absorption inMoSe2/graphene oxide heterostructure: Quenching of exciton bands

Cited by 62 publications

References 39 publications

Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Near resonant nanosecond laser-driven nonlinear optical response in As₅₀S₅₀ thin films

Structural, Spectroscopic, and Excitonic Dynamic Characterization in Atomically Thin Yb³⁺‐Doped MoS₂, Fabricated by Femtosecond Pulsed Laser Deposition

Contact Info

Product

Resources

About

Strong interlayer coupling mediated giant two-photon absorption inMoSe2/graphene oxide heterostructure: Quenching of exciton bands

Cited by 62 publications

References 39 publications

Dynamical Nature of Exciton‐Polariton Coupling in WS2 Nanoparticles

Dynamical Nature of Exciton‐Polariton Coupling in WS2 Nanoparticles

Near resonant nanosecond laser-driven nonlinear optical response in As50S50 thin films

Structural, Spectroscopic, and Excitonic Dynamic Characterization in Atomically Thin Yb3+‐Doped MoS2, Fabricated by Femtosecond Pulsed Laser Deposition

Contact Info

Product

Resources

About

Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Dynamical Nature of Exciton‐Polariton Coupling in WS₂ Nanoparticles

Near resonant nanosecond laser-driven nonlinear optical response in As₅₀S₅₀ thin films

Structural, Spectroscopic, and Excitonic Dynamic Characterization in Atomically Thin Yb³⁺‐Doped MoS₂, Fabricated by Femtosecond Pulsed Laser Deposition