Nanopillar arrays with nanoparticles fabricated by a femtosecond laser pulse train for highly sensitive SERRS

Yang, Qianqian; Li, Xin; Jiang, Lan; Zhang, Ning; Zhang, Guangming; Shi, Xuesong; Zhang, Kaihu; Hu, Jie; Lu, Yongfeng

doi:10.1364/ol.40.002045

Cited by 27 publications

(27 citation statements)

References 24 publications

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“…To validate the proposed method of EDC-based fabrication method through temporal and spatial shaping of femtosecond laser pulses, many experiments have been conducted 119 , 120 , 121 , 122 , 123 , 124 , 125 , 126 , 127 , 128 . By designing temporally shaped pulse trains, we can control the localized transient electron density to induce resonance absorption; thus, high efficiency fabrication can be achieved 119 , 120 .…”

Section: Experiments: Edc-based Novel Fabrication Methodsmentioning

confidence: 99%

“…Based on EDC, we proposed to: control the localized transient electron density to induce resonance absorption, by which microchannel processing efficiency was increased by 56 times and the maximum aspect ratio was extended by three times 119 , 120 ; modify free electron density and the corresponding photon absorption efficiency, then modulate material properties, by which laser-assisted chemical etching rate was enhanced by 37 times 121 ; adjust electron generation on fabricated material surfaces, through which the periods, orientations and structures of the surface ripples can be effectively adjusted 122 , 123 ; control electron density and its distribution, through which we obtained controllable micro/nano hierarchical structures on material surfaces and enhancement factors of surface-enhanced Raman scattering (SERS) up to 1.1 × 10 9 (Refs. 124 , 125 , 126 ); control electron density distribution using temporally shaped femtosecond laser pulse to modify chemical and physical properties of materials, by which polymorphous Au-MoS 2 hybrids were prepared 127 ; adjust the phase change mechanism by changing photon-electron interactions, which reduced the recast layer thickness by 60% (Ref. 128 ); manipulate electron density distribution using spatially modulated femtosecond laser pulse, by which deep subwavelength (∼1/14 of the laser wavelength) and high conductivity (∼1/4 of the bulk gold) nanowires were fabricated in the open air 129 .…”

Section: Introductionmentioning

confidence: 99%

“…control electron density and its distribution, through which we obtained controllable micro/nano hierarchical structures on material surfaces and enhancement factors of surface-enhanced Raman scattering (SERS) up to 1.1 × 10 9 (Refs. 124 , 125 , 126 );…”

Section: Introductionmentioning

confidence: 99%

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Electrons dynamics control by shaping femtosecond laser pulses in micro/nanofabrication: modeling, method, measurement and application

et al. 2017

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During femtosecond laser fabrication, photons are mainly absorbed by electrons, and the subsequent energy transfer from electrons to ions is of picosecond order. Hence, lattice motion is negligible within the femtosecond pulse duration, whereas femtosecond photon-electron interactions dominate the entire fabrication process. Therefore, femtosecond laser fabrication must be improved by controlling localized transient electron dynamics, which poses a challenge for measuring and controlling at the electron level during fabrication processes. Pump-probe spectroscopy presents a viable solution, which can be used to observe electron dynamics during a chemical reaction. In fact, femtosecond pulse durations are shorter than many physical/chemical characteristic times, which permits manipulating, adjusting, or interfering with electron dynamics. Hence, we proposed to control localized transient electron dynamics by temporally or spatially shaping femtosecond pulses, and further to modify localized transient materials properties, and then to adjust material phase change, and eventually to implement a novel fabrication method. This review covers our progresses over the past decade regarding electrons dynamics control (EDC) by shaping femtosecond laser pulses in micro/nanomanufacturing: (1) Theoretical models were developed to prove EDC feasibility and reveal its mechanisms; (2) on the basis of the theoretical predictions, many experiments are conducted to validate our EDC-based femtosecond laser fabrication method. Seven examples are reported, which proves that the proposed method can significantly improve fabrication precision, quality, throughput and repeatability and effectively control micro/nanoscale structures; (3) a multiscale measurement system was proposed and developed to study the fundamentals of EDC from the femtosecond scale to the nanosecond scale and to the millisecond scale; and (4) As an example of practical applications, our method was employed to fabricate some key structures in one of the 16 Chinese National S&T Major Projects, for which electron dynamics were measured using our multiscale measurement system.

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Section: Experiments: Edc-based Novel Fabrication Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electrons dynamics control by shaping femtosecond laser pulses in micro/nanofabrication: modeling, method, measurement and application

et al. 2017

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“…Coating these micro/nanopatterned 5 surfaces with thin metallic layers results in the spontaneous formation of metallic nanoparticles, rendering them plasmon-active. Nanosecond and femtosecond laser-patterned silicon wafers, coated with metallic thin films and nanoparticles, have been used as efficient SERS substrates with liquid analytes recently [29][30][31][32][33][34][35][36] . Nanostructured silicon with gold nanoparticles was employed as a SERS substrate for Rhodamine 6G spectroscopy and provided enhancement factors of 10 4 31 and 10 7 33,34 .…”

Section: Introductionmentioning

confidence: 99%

Surface-Enhanced Raman Spectroscopy of Graphene Integrated in Plasmonic Silicon Platforms with Three-Dimensional Nanotopography

et al. 2019

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Integrating graphene with plasmonic nanostructures results in multifunctional hybrid systems with enhanced performance for numerous applications. In this work, we take advantage of the remarkable mechanical properties of graphene to combine it with scalable 3D plasmonic nanostructured silicon substrates, which enhance the interaction of graphene with electromagnetic radiation. Large areas of femtosecond laser-structured arrays of silicon nanopillars, decorated with gold nanoparticles, are integrated with graphene, which conforms to the substrate nanotopography. We obtain Raman spectra at 488, 514, 633, and 785 nm excitation wavelengths, spanning the entire visible range. For all excitation wavelengths, the Raman signal of graphene is enhanced by 2-3 orders of magnitude, similarly to the highest enhancements measured to date, concerning surface-enhanced Raman spectroscopy (SERS) of graphene on plasmonic substrates. Moreover, in contrast to traditional deposition and lithographic methods, the fabrication method employed here relies on single-step, maskless, cost-effective, rapid laser processing of silicon in water, amenable to large-scale fabrication. Finite-difference time-domain 3 simulations elucidate the advantages of the 3D topography of the substrate. Conformation of graphene to the Au-decorated silicon nanopillars enables graphene to sample near fields from an increased number of nanoparticles. Due to synergistic effects with the nanopillars, different nanoparticles become more active for different wavelengths and locations on the pillars, providing broadband enhancement. Nanostructured plasmonic silicon is a promising platform for integration with graphene and other 2D materials, for next-generation applications of large-area hybrid nanomaterials in the fields of sensing, photonics, optoelectronics, and medical diagnostics.

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“…[11][12][13][14][15][16][17] Large-area microstructured surfaces can be fabricated by the classical femtosecond laser direct writing method. 18 In our experiment, square polytetrafluoroethylene (PTFE) samples with dimensions of 42 Â 42 Â 0.2 mm were used as the substrate.…”

mentioning

confidence: 99%

Superamphiphobic miniature boat fabricated by laser micromachining

Yin

Dong

Zhang

et al. 2017

Applied Physics Letters

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We fabricated a superamphiphobic miniature boat with marked drag reduction and excellent loading capacity using femtosecond laser direct writing technology. The as-prepared superamphiphobic surface of the boat exhibited apparent contact angles larger than 150° toward both water and oil. Miniature boats with the superamphiphobic surface slid effortlessly on both water and oil-polluted water surfaces, with an increase in sliding distance by up to 52% and load increase of up to 27% compared with those of a boat with an untreated surface. A potential mechanism that explains the excellent performance of the superamphiphobic miniature boat was also discussed. This work provides a simple and economically viable strategy to obtain advanced surfaces for use in microfluidics and marine engineering.

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Nanopillar arrays with nanoparticles fabricated by a femtosecond laser pulse train for highly sensitive SERRS

Cited by 27 publications

References 24 publications

Electrons dynamics control by shaping femtosecond laser pulses in micro/nanofabrication: modeling, method, measurement and application

Electrons dynamics control by shaping femtosecond laser pulses in micro/nanofabrication: modeling, method, measurement and application

Surface-Enhanced Raman Spectroscopy of Graphene Integrated in Plasmonic Silicon Platforms with Three-Dimensional Nanotopography

Superamphiphobic miniature boat fabricated by laser micromachining

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