Femtosecond and nanosecond laser fabricated substrate for surface-enhanced Raman scattering

Hamdorf, Adam; Olson, Matthew; Lin, Cheng‐Tung; Jiang, Lan; Zhou, Jun; Xiao, Hai; Tsai, Hai-Lung

doi:10.1364/ol.36.003353

Cited by 21 publications

(21 citation statements)

References 14 publications

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“…Graphene on nanostructured silicon leads to additional modifications of the nanoparticle morphology 34 . Thus, the optical properties of the plasmonic substrates may be tuned according to the application 29,30,34 . For all wavelengths, the D peak appears more intense for the nanostructured silicon substrates (coated and uncoated).…”

Section: Resultsmentioning

confidence: 99%

“…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%

“…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 . Arrays of silicon nanopillars with silver nanoparticles demonstrated high sensitivity and reusability as a SERS substrate for Rhodamine 6G and Methylene blue 35 , while resulting in a Raman enhancement factor of 10 9 for melamine molecules 36 and 10 7 for benzenethiol 30 .…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

et al. 2019

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“…The size and density of the metal nanoparticles depends on the amount (nominal thickness) of the metal coating, the deposition rate, and the substrate temperature 29 . Post-deposition laser heating and melting of the metallic layer can lead to additional modifications of the nanoparticle morphology 41 . Tuning the fabrication parameters allows for controlling the morphology and optical properties of the plasmonic substrates, including the resonance wavelength, and maintaining the repeatability in the measurement of the trapping efficiencies observed here.…”

Section: Discussionmentioning

confidence: 99%

Plasmon enhanced optical tweezers with gold-coated black silicon

Kotsifaki

Kandyla

Lagoudakis

2016

Sci Rep

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Plasmonic optical tweezers are a ubiquitous tool for the precise manipulation of nanoparticles and biomolecules at low photon flux, while femtosecond-laser optical tweezers can probe the nonlinear optical properties of the trapped species with applications in biological diagnostics. In order to adopt plasmonic optical tweezers in real-world applications, it is essential to develop large-scale fabrication processes without compromising the trapping efficiency. Here, we develop a novel platform for continuous wave (CW) and femtosecond plasmonic optical tweezers, based on gold-coated black silicon. In contrast with traditional lithographic methods, the fabrication method relies on simple, single-step, maskless tabletop laser processing of silicon in water that facilitates scalability. Gold-coated black silicon supports repeatable trapping efficiencies comparable to the highest ones reported to date. From a more fundamental aspect, a plasmon-mediated efficiency enhancement is a resonant effect, and therefore, dependent on the wavelength of the trapping beam. Surprisingly, a wavelength characterization of plasmon-enhanced trapping efficiencies has evaded the literature. Here, we exploit the repeatability of the recorded trapping efficiency, offered by the gold-coated black silicon platform, and perform a wavelength-dependent characterization of the trapping process, revealing the resonant character of the trapping efficiency maxima. Gold-coated black silicon is a promising platform for large-scale parallel trapping applications that will broaden the range of optical manipulation in nanoengineering, biology, and the study of collective biophotonic effects.

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“…For the latter, femtosecond (fs) laser machining has recently become a popular fabrication technique. [13][14][15][16] But the drawbacks of the laser machining are high costs and time consumption. In this respect, soft lithography, which provides a simple way for replication of the substrates, can serve as a convenient method for mass fabrication.…”

Section: Introductionmentioning

confidence: 99%

Microstructured polymer‐based substrates with broadband absorption for surface‐enhanced Raman scattering

Yang

Jiwei

et al. 2013

J Raman Spectroscopy

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Large area (3 × 3 cm 2 ) substrates for surface-enhanced Raman scattering were fabricated by combining femtosecond laser microstructuring and soft lithography techniques. The fabrication procedure is as follows: (i) femtosecond laser machining is used to create a silicon master copy, (ii) replicates from polydimethylsiloxane are made, and (iii) a 50-nm-thick gold film is deposited on the surface of the replicates. The resulting substrates exhibit strongly enhanced absorption in the spectral region of 350 ∼ 1000 nm and generate enhanced Raman signal with enhancement factor of the order of 10 7 for 10 -6 M rhodamine 6G. The main advantages of our substrates are low cost, large active area, and possibility for mass replication.

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Femtosecond and nanosecond laser fabricated substrate for surface-enhanced Raman scattering

Cited by 21 publications

References 14 publications

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

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

Plasmon enhanced optical tweezers with gold-coated black silicon

Microstructured polymer‐based substrates with broadband absorption for surface‐enhanced Raman scattering

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