Time-resolved analysis of thickness-dependent dewetting and ablation of silver films upon nanosecond laser irradiation

Qi, Dongfeng; Paeng, Dongwoo; Yeo, Junyeob; Kim, Eunpa; Wang, Letian; Chen, Songyan; Grigoropoulos, Costas P.

doi:10.1063/1.4952597

Cited by 29 publications

(21 citation statements)

References 27 publications

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“…2(e)), where the evident increase of the nanopore diameter can be identified. Specifically, in the certain range of the incident pulse energies E, the molten rim becomes hydrodynamically unstable undergoing the periodical modulation of its height ("crowning" [46][47][48] ) governed by the Rayleigh-Plateau hydrodynamic instability. The printed microrings, with their well-controlled micrometer-scale diameter and pronounced nanotexture governed by the unveiled multiple circumferentiallyspaced pores, are expected to provide strong near-field enhancement of incident electromagnetic waves in visible and IR spectra ranges, making them promising for chemo-and biosensing applications.…”

Section: Fig 2 (A) Series Of Normal-view False-color Sem Images Ofmentioning

confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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Pulsed-laser dry printing of noble-metal microrings with a tunable internal porous structure, which can be revealed via an ion-beam etching post-procedure, was demonstrated. Abundance and average size of the pores inside the microrings were shown to be tuned in a wide range by varying incident pulse energy and a nitrogen doping level controlled in the process of magnetron deposition of the gold film in the appropriate gaseous environment. The fabricated porous microrings were shown to provide many-fold near-field enhancement of incident electromagnetic fields, which was confirmed by mapping of the characteristic Raman band of a nanometer-thick covering layer of Rhodamine 6G dye molecules and supporting finite-difference time-domain calculations. The proposed laserprinting/ion-beam etching approach is demonstrated to be a unique tool aimed at designing and fabricating multifunctional plasmonic structures and metasurfaces for spectroscopic bioidentification based on surface-enhanced infrared absorption, Raman scattering and photoluminescence detection schemes.Surface-enhanced Raman scattering (SERS) is an ultra-sensitive non-invasive spectroscopic technique based on a label-free identification of different molecules placed in the vicinity of plasmonic-active nanostructured metallic substrates 1-4 . Intensity of the characteristic Raman signal defining the specific vibrational signatures of individual molecules is usually very weak. However, this signal can be significantly increased near nanotextured surfaces or nanostructures generating localized, strongly enhanced plasmon-mediated electromagnetic fields. Since the first observation of SERS signal from single molecule 5 , multiple attempts were undertaken to increase the efficiency of SERS-active nanotextured substrates in terms of achieved maximal enhancement factor inside a single "hot spot" as well as number (density) of "hot spots" per individual nanostructure 6-11 .To address both issues, variety of nanotextured structures, predominantly having large surface-to-volume ratio and generating dense hot spots (tipped structures, nanostructures with inner porosity, intra-gap structures or self-assembly superstructures, etc.) were fabricated and tested as versatile SERS substrates 12-23 . Specifically, porous materials, nanostructures and nanoparticles, routinely reaching uniform SERS enhancement sufficient to overcome single-molecule detection limit independently on excitation/detection conditions, are of growing interest [24][25][26] . Several papers reported fabrication of such sponge-like structures, using dealloying of the two-component template via its dissolving in a corrosive environment 27,28 . Meanwhile, to design sensitive elements for advanced biosensors, along with desirable porosity, it is also important to control the overall size and shape of such porous templates as well as to arrange them into well-ordered arrays at specific point on a substrate with micrometer-scale lateral accuracy. Despite the latter issue can be resolved by using well-establis...

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Section: Fig 2 (A) Series Of Normal-view False-color Sem Images Ofmentioning

confidence: 99%

Fabrication of porous microrings via laser printing and ion-beam post-etching

Syubaev

Nepomnyashchiy

Mitsai

et al. 2017

Applied Physics Letters

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“…However, FTO thin film is not an appropriate material for the flexible transparent conductor since it is usually delicate and brittle. Hence, instead of FTO thin film, alternative conducting nanomaterials such as carbon nanotube (CNT) [ 1 , 2 ], graphene [ 3 , 4 , 5 ], metal nanoparticle (NP) mesh [ 6 , 7 , 8 , 9 ], metal nanowires (NWs) [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 ], and metal nano-thin film [ 20 , 21 ] are used in the research field for the flexible transparent conductor and stretchable conductor.…”

Section: Introductionmentioning

confidence: 99%

Rapid and Effective Electrical Conductivity Improvement of the Ag NW-Based Conductor by Using the Laser-Induced Nano-Welding Process

et al. 2017

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To date, the silver nanowire-based conductor has been widely used for flexible/stretchable electronics due to its several advantages. The optical nanowire annealing process has also received interest as an alternative annealing process to the Ag nanowire (NW)-based conductor. In this study, we present an analytical investigation on the phenomena of the Ag NWs’ junction and welding properties under laser exposure. The two different laser-induced welding processes (nanosecond (ns) pulse laser-induced nano-welding (LINW) and continuous wave (cw) scanning LINW) are applied to the Ag NW percolation networks. The Ag NWs are selectively melted and merged at the junction of Ag NWs under very short laser exposure; these results are confirmed by scanning electron microscope (SEM), focused-ion beam (FIB), electrical measurement, and finite difference time domain (FDTD) simulation.

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“…The former results show that holes can be fabricated at the fluence of 8.26 mJ/cm 2 . In addition, direct laser writing (DLW) in processing is a fast and flexible method for long periodic grating fabrication [29]. Figure 5 shows the laser direct writing single gratings (a–c) and the composite gratings (d–f) at the laser scanning velocity of 1, 2 and 5 mm/s, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…At present, optical detection technology has been used in laser–material interaction research [24,25]. For example, Pump-probing and time-resolved shadow-graphics techniques have been used to directly observe ablation processes in very short (picosecond) timescale [26,27,28,29]. At present, there were few studies on the surface morphology evolution of femtosecond laser-induced chalcogenide glass materials, and the mechanism of the surface morphology evolution is still not perfectly explained.…”

Section: Introductionmentioning

confidence: 99%

In-Situ and Ex-Situ Characterization of Femtosecond Laser-Induced Ablation on As2S3 Chalcogenide Glasses and Advanced Grating Structures Fabrication

Wang

et al. 2018

Materials

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Femtosecond laser pulse of 800 nm wavelength and 150 fs temporal width ablation of As2S3 chalcogenide glasses is investigated by pump-probing technology. At lower laser fluence (8.26 mJ/cm2), the surface temperature dropping to the melting point is fast (about 43 ps), which results in a clean hole on the surface. As the laser fluence increases, it takes a longer time for lattice temperature to cool to the melting point at high fluence (about 200 ps for 18.58 mJ/cm2, about 400 ps for 30.98 mJ/cm2). The longer time of the surface heating temperature induces the melting pool in the center, and accelerates material diffusing and gathering surrounding the crater, resulting in the peripheral rim structure and droplet-like structure around the rim. In addition, the fabricated long periodic As2S3 glasses diffraction gratings can preserve with high diffraction efficiency by laser direct writing technology.

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Time-resolved analysis of thickness-dependent dewetting and ablation of silver films upon nanosecond laser irradiation

Cited by 29 publications

References 27 publications

Fabrication of porous microrings via laser printing and ion-beam post-etching

Fabrication of porous microrings via laser printing and ion-beam post-etching

Rapid and Effective Electrical Conductivity Improvement of the Ag NW-Based Conductor by Using the Laser-Induced Nano-Welding Process

In-Situ and Ex-Situ Characterization of Femtosecond Laser-Induced Ablation on As2S3 Chalcogenide Glasses and Advanced Grating Structures Fabrication

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