Nonlinear optical performance of few-layer molybdenum diselenide as a slow-saturable absorber

Laser & Photonics Reviews

Baker‐Murray

Blau

2019

Self Cite

143

104

Wide-spectral saturable absorption (SA) has been experimentally demonstrated in two-dimensional (2D) nanomaterials with outstanding performance, such as low saturation intensity, deep modulation depth, and fast recovery time of excited carriers. Hence, 2D nanomaterials can be utilized as saturable absorbers for mode-locking or Q-switching to generate laser pulses with short duration and high repetition rate. Here, the SA properties of graphene, layered transition metal dichalcogenides, Group-V elements, and other 2D nanomaterials are reviewed by summarizing their slow-or fastsaturable absorption behavior using the modified Frantz-Nodvik model or the steady-state solution of Hercher's rate equations. The dependence of SA in 2D nanomaterials on excitation wavelength, linear absorption coefficient, and pulse duration is also explained. Finally, the applications of these 2D nanomaterials in a range of pulsed lasers are summarized. Figure 2. a-c) Schemes showing the principle of open-aperture (a), closed-aperture Z-scans (b), and I-scan (c).

Section: Saturable Absorptionmentioning

confidence: 99%

Section: Saturable Absorptionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Saturable Absorption in 2D Nanomaterials and Related Photonic Devices

Laser & Photonics Reviews

Baker‐Murray

Blau

2019

Self Cite

143

104

“…As a precursor to the fabrication of MoSe 2 /PVA composite thin films, two dimensional MoSe 2 flakes were prepared from bulk MoSe 2 in the distilled (DI) water using sodium cholate (SC) as a surfactant using a liquid-phase exfoliation technique [14,15,21]. 1g MoSe 2 powder was dispersed in 20 ml aqueous surfactant solution with a concentration of SC of 10 mg/ml.…”

Section: Materials and Characterizationmentioning

confidence: 99%

“…2D materials have been the focus of research in many fields due to their novel physical, chemical, optical, and mechanical properties. As a big branch of 2D materials, layered transition metal dichalcogenides (TMDs) such as MoS 2 , MoSe 2 , WS 2 , WSe 2 and WSn 2 etc., are reported to possess improved optical performance, such as photoluminescence, when compared to their bulk counterparts [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Particularly, the nonlinear optical experiments indicate that 2D liquid-phase-exfoliated MoSe 2 has strong saturable absorption [17,18].…”

Section: Introductionmentioning

confidence: 99%

Broadband saturable absorption and exciton-exciton annihilation in MoSe₂ composite thin films

Baker‐Murray

Zhang

et al. 2019

Opt. Mater. Express

Self Cite

Polyvinyl alcohol (PVA) was utilized as a matrix to host two-dimensional (2D) liquid-phase-exfoliated MoSe 2 nanosheets. These 2D MoSe 2 /PVA composite thin films were experimentally proven to be preferable for efficient nonlinear optical devices. Our nonlinear optical study shows that these composite thin films possess strong saturable absorption (SA) over a wide wavelength range from 400 nm to 800 nm under the irradiation of femtosecond and nanosecond lasers. The SA property of our films was measured for various laser pulse durations, wavelength and linear absorption. Moreover, employing pump-probe, excitonexciton annihilation was experimentally observed and studied at 800 nm. Our research gives clear insight into the photophysical properties of MoSe 2 /PVA thin films and shows the material's potential as a photonic device.

Layered PtSe₂ for Sensing, Photonic, and (Opto‐)Electronic Applications

McEvoy

et al. 2020

Advanced Materials

Self Cite

An increasing enthusiasm for research into 2D nanostructures is driven by their exceptional mechanical, chemical, optical, and physical properties that arise from their atomically thin dimension. These properties make 2D nanostructures promising candidates for applications in the next generation of photonic, valleytronic, and (opto-)electronic devices. 2D black phosphorus, for instance, is a novel 2D material with a thickness-tunable bandgap and outstanding properties that have attracted tremendous interest. However, its commercial and industrial applications have been greatly hindered by its poor environmental stability. [1] Layered transition metal dichalcogenides (TMDs), such as MoS 2 , WS 2 , and MoSe 2 , have been experimentally demonstrated to possess thickness-dependent bandgaps and many other promising physical, chemical, and mechanical properties. However, the majority of these TMDs suffer from relatively low charge-carrier mobilities, rather large Schottky barriers when contacted with metals, complicated fabrication processes and a narrow spectral response mainly in the visible region. [2,3] As a result, even though the first report on the experimental isolation of graphene was 16 years ago, [4] and researchers worldwide have spent massive time and effort investigating 2D materials, thus far few have been effectively employed in industrial and commercial applications. Recently, layered PtSe 2 , a Group-10 TMD, has been demonstrated to be one of the most promising 2D materials for adoption by industries due to its unprecedented photonic, physical, and chemical properties along with lowtemperature synthesis methods, high charge-carrier mobilities and long-term air stability. [5-11] One of the important industrial advantages of PtSe 2 is the developed synthesis methods, some of which are compatible with modern silicon technologies. The studied methods to synthesize layered PtSe 2 include molecular-beam epitaxy (MBE), [7,12] chemical vapor deposition (CVD), [8,13] thermally assisted conversion (TAC), [14-20] chemical vapor transport (CVT), [5] plasma-assisted selenization (PAS), [21] microwave assisted synthesis (MAS), [22] mechanical exfoliation (ME), [13,23] the wet chemical (WC) method, [24,20] and so on. Both MBE and CVD are typically carried out at high temperature and can result in high-quality PtSe 2 monolayers. In contrast, wafer-scale and thickness-tunable layered PtSe 2 can be obtained using TAC Since the first experimental discovery of graphene 16 years ago, many other 2D layered nanomaterials have been reported. However, the majority of 2D nanostructures suffer from relatively complicated fabrication processes that have bottlenecked their development and their uptake by industry for practical applications. Here, the recent progress in sensing, photonic, and (opto-)electronic applications of PtSe 2 , a 2D layered material that is likely to be used in industries benefiting from its high air-stability and semiconductor-technology-compatible fabrication methods, is reviewed. The advantages and disad...