Technique and model for modifying the saturable absorption (SA) properties of 2D nanofilms by considering interband exciton recombination

Liang, Guowen; Zeng, Longhui; Tsang, Yuen Hong; Tao, Lili; Tang, Chun; Cheng, Ping; Liu, Hui; Liu, Xin; Li, Ji; Qu, Junle; Qiao, Wen

doi:10.1039/c8tc00498f

Cited by 33 publications

(12 citation statements)

References 72 publications

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“…The interaction of ultrafast laser pulse with nanomaterials gives rise to an interesting phenomenon called saturable absorption (SA), which reflects optical transparency, − and it has all-optical and communication applications. ,− The SA property of noble metals could be extended as important applications such as Q-switching and mode-locking devices. − Conventional saturable absorbers like doped crystals and semiconductor saturable absorber mirror (SESAM) have some constraints including narrow operation bandwidth, limited response time, high cost, and complex fabrication process . In the present work, the aforementioned limitations were addressed by the soft synthesis of widely tunable plasmonic hollow silver nanocubes (HAgNCs).…”

Section: Introductioncontrasting

confidence: 88%

Femtosecond-Laser-Induced Saturable Absorption and Optical Limiting of Hollow Silver Nanocubes: Implications for Optical Switching and Bioimaging

Dadhich

Bhattacharya

Ballav

et al. 2020

ACS Appl. Nano Mater.

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The effects of shape, size, and surface plasmon resonance (SPR) peak position (λ SPR ) on nonlinear absorption (NLA) were investigated at 808 nm, using a femtosecond laser. We found that NLA behavior is the result of competition between saturable absorption (SA) and reverse saturable absorption (RSA). SA behavior, i.e., optical transparency in silver nanocrystals, is introduced by the change in shape and structure from solid nanospheres to hollow nanocubes. For the latter, SA behavior dominates at low input irradiance, while RSA dominates at higher laser powers. A series of hollow silver nanocubes (HAgNCs) was synthesized that exhibit SPR peaks at 510, 550, 590, and 630 nm, hence named as HAgNC-510, HAgNC-550, HAgNC-590, and HAgNC-630, respectively. The edge lengths (l) of HAgNC-510, HAgNC-550, HAgNC-590, and HAgNC-630 were determined to be 33 ± 4, 45 ± 8, 70 ± 10, and 100 ± 15 nm. The switching of SA to RSA occurred at lower laser power for larger HAgNCs as compared to the smaller ones. The saturation intensity (I sat ) was found to vary linearly with the size of HAgNCs. Moreover, for a four-times rise in input pulse intensity (63 → 252 GW/cm 2 ), a huge increase of 3650% in the NLA coefficient, β eff , was observed for HAgNC-590, whereas merely 19% increase was found for the solid silver nanoparticles (SAgNP-400). The extraordinary enhancement in β eff is attributed to the enhanced electric field at the sharp edges and corners of the nanocubes. The red-tailing of SPR peaks also had a significant effect on the values of β eff . The outcomes, i.e., optical transparency and SA−RSA switching, will open vistas for a variety of diverse applications such as optical switching, limiting, and bioimaging.

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Section: Introductioncontrasting

confidence: 88%

Femtosecond-Laser-Induced Saturable Absorption and Optical Limiting of Hollow Silver Nanocubes: Implications for Optical Switching and Bioimaging

Dadhich

Bhattacharya

Ballav

et al. 2020

ACS Appl. Nano Mater.

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“…Reference [43] demonstrated that higher percentage of modulation depth and saturation intensity can be obtained by using higher pulse energy and/or shorter pulse. incorporated into the cavity between the isolator and OC.…”

Section: Go Sa Fabrication and Characterizationmentioning

confidence: 99%

Reduction‐controlled graphene oxide saturable absorbers and its effect on ultrashort Er‐doped fibre laser

Ismail

Razak

Harun

et al. 2021

IET Optoelectronics

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The authors controlled the reduction of three graphene oxide (GO) saturable absorber (SA) thin films by controlling the exposure time under a solar simulator and afterwards, incorporated them into an Er‐doped fibre laser in order to investigate their effect on ultrashort pulse. The authors also hypothesized that the controlled reduction would result in a controlled absorption, and ultimately, a controlled modulation depth. A larger modulation depth would lead to stronger pulse shaping and shorter pulse duration. Sample A was left unreduced, whereas samples B and C were exposed for 15 and 30 min, respectively. Afterwards, their modulation depths were measured using twin‐detector method and determined to be 0.69%, 1.2% and 1.94%, respectively. When used as an SA in an Er‐doped fibre laser, the result showed pulse duration shortening; from 670 to 520 fs, as well as spectral broadening; from 4.22 to 6.73 nm. In addition, we also observed changes in repetition rate, output power and time‐bandwidth product (TBP). The result of this paper shows the feasibility of controlling the modulation depth of a GO SA and conclusively shows the effect of modulation depth on ultrashort pulse.

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“…Ultrafast photonics, which has witnessed considerable progress through the development of ultrafast laser techniques, is an important research area describing the structure and transient ultrafast motion of atoms or molecules. − The study and advancement of ultrafast laser pulse generation play a significant role in the development and innovation of this field. In general, ultrashort laser pulses can be generated using optical switchers based on saturable absorbers (SAs) to regulate light in the resonant cavity periodically; the saturable absorption behaviors of these SAs are determined by the third-order nonlinear optical absorption of the materials involved. − SAs constitute a crucial element of passively mode-locked lasers and directly dictate the pulse performance. The high third-order optical nonlinearity, simplified fabrication process, wide absorption band, and ultrafast recovery time of these 2D materials endow them with unique superior capabilities for SA applications.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Photonics of Ternary Re_xNb_(1–x)S₂ in Fiber Lasers

Pang

Sun

Zhao

et al. 2021

ACS Appl. Mater. Interfaces

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Two-dimensional (2D) transition metal chalcogenides (TMCs) become more attractive upon addition of a third element owing to their unique structure and remarkable physical and chemical properties, which endow these materials with considerable potential for applications in nanoscale devices. In this work, a Re x Nb(1–x)S2-based saturable absorber (SA) device for ultrafast photonics applications is studied. The device is assembled by placing Re x Nb(1–x)S2 nanosheets with a thickness of 1–3 nm onto a microfiber to increase their compatibility with an all-fiber laser cavity. The prepared Re x Nb(1–x)S2-based device exhibits a modulation depth of 24.3%, a saturation intensity of 10.1 MW/cm2, and a nonsaturable loss of 28.5%. Furthermore, the Re x Nb(1–x)S2-based device is used to generate ultrashort pulses in an erbium-doped fiber (EDF) laser cavity. At a pump power of 260 mW, the EDF laser operates in a conventional soliton mode-locked region. The pulse width is 285 fs, and the repetition frequency is 61.993 MHz. In particular, the bound-state soliton mode-locking operation is successfully obtained in a pump power range of 300–900 mW. The bound-state pulses are formed by doubling identical solitons with a temporal interval of 0.8 ps. The output power is as high as 47.9 mW, and the repetition frequency is 123.61 MHz. These results indicate that the proposed Re x Nb(1–x)S2-based SAs have comparable properties to currently used 2D SAs and provide a basis for their application in the field of ultrafast photonics.

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Technique and model for modifying the saturable absorption (SA) properties of 2D nanofilms by considering interband exciton recombination

Abstract: A technique for modifying the saturable absorption (SA) properties of 2D nanofilms and a pulse width-dependent theoretical model of SA considering interband exciton recombination have been successfully demonstrated.

Cited by 33 publications

References 72 publications

Femtosecond-Laser-Induced Saturable Absorption and Optical Limiting of Hollow Silver Nanocubes: Implications for Optical Switching and Bioimaging

Femtosecond-Laser-Induced Saturable Absorption and Optical Limiting of Hollow Silver Nanocubes: Implications for Optical Switching and Bioimaging

Reduction‐controlled graphene oxide saturable absorbers and its effect on ultrashort Er‐doped fibre laser

Ultrafast Photonics of Ternary Re_xNb_(1–x)S₂ in Fiber Lasers

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Technique and model for modifying the saturable absorption (SA) properties of 2D nanofilms by considering interband exciton recombination

Abstract: A technique for modifying the saturable absorption (SA) properties of 2D nanofilms and a pulse width-dependent theoretical model of SA considering interband exciton recombination have been successfully demonstrated.

Cited by 33 publications

References 72 publications

Femtosecond-Laser-Induced Saturable Absorption and Optical Limiting of Hollow Silver Nanocubes: Implications for Optical Switching and Bioimaging

Femtosecond-Laser-Induced Saturable Absorption and Optical Limiting of Hollow Silver Nanocubes: Implications for Optical Switching and Bioimaging

Reduction‐controlled graphene oxide saturable absorbers and its effect on ultrashort Er‐doped fibre laser

Ultrafast Photonics of Ternary RexNb(1–x)S2 in Fiber Lasers

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Ultrafast Photonics of Ternary Re_xNb_(1–x)S₂ in Fiber Lasers