Optical characterizations of two-dimensional materials using nonlinear optical microscopies of CARS, TPEF, and SHG

Li, Rui; Zhang, Yajun; Xu, Xuefeng; Zhou, Yi; Chen, Maodu; Sun, Mengtao

doi:10.1515/nanoph-2018-0002

Cited by 37 publications

(27 citation statements)

References 31 publications

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“…The laser wavelength was 780 nm and the relevant experimental setup can be found in the supporting information (Figure S2a, Supporting Information). As is shown in Figure S2b in the Supporting Information, the measured PESHG intensities increased linearly with the increase of the square of the excitation power which is characteristic of SHG . In order to clearly indicate the wavelength of PESHG, the spectra of the PESHG are shown in Figure S3 in the Supporting Information.…”

Section: Resultsmentioning

confidence: 94%

3D Hotspots Platform for Plasmon Enhanced Raman and Second Harmonic Generation Spectroscopies and Quantitative Analysis

Yang

Meng

Lin

et al. 2019

Advanced Optical Materials

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devices, [6] and Raman, [7] fluorescence, [8,9] even infrared [10] spectroscopy. Nonetheless, the lack of high-efficiency substrates with uniformly distributed hotspots greatly hinders the widespread and practical application of plasmon-enhanced spectroscopies (PESs), such as plasmon enhanced second harmonic generation (PESHG) and surface-enhanced Raman scattering (SERS). Hence, constructing hotspot platforms with high-efficiency is of great importance. At present, 0D, 1D, and 2D hotspots based on different types of metal nanostructures are the most frequently used enhancement structures, such as 0D single isolated nanospheres, [11] 1D nanowires [12] or nanorods, [13,14] and 2D nanoarrays, [15][16][17][18] synthesized using various nanofabrication techniques. However, these low spatial dimensions limit the number of hotspots that can be generated and thus impede further improvements in the detection sensitivity of PESs.Due to the higher density of hotspots and larger surface area for adsorbing probe molecules, 3D hotspot platforms can give stronger and more stable SERS signals than that of 0D, 1D, or 2D nanostructures. However, the rational design and simple construction of 3D SERS substrates with controllable and reproducible nanoscale hotspots and stronger Raman enhancement factors via a facile and green approach is a longstanding challenge and numerous efforts have been devoted to their fabrication. Ag NP decorated cactus-like 3D SERS substrates [19] and 3D hot-junction formation of gold nanoparticles on 2D silicate nanoplatelets [20] had been designed, which exhibited good reproducibility and considerable SERS signal amplification. Also, it had been demonstrated that SERS enhancements of 3 orders of magnitude could be generated during evaporation of a drop containing pure Ag NPs solution compared with the dried substrate. [21] Unfortunately, the SERS signals were not stable and rapidly decreased after the complete evaporation of water. To alleviate this drawback, aqueous glycerol was added in the Ag NPs sol to slow the evaporation, [22] which extended the duration of maximum Raman signal. However, the Raman signal kept decreasing with time due to charge exchange among aggregated Ag NPs. Considering this charge

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Section: Resultsmentioning

confidence: 94%

3D Hotspots Platform for Plasmon Enhanced Raman and Second Harmonic Generation Spectroscopies and Quantitative Analysis

Yang

Meng

Lin

et al. 2019

Advanced Optical Materials

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“…Our homemade setup of nonlinear optical microscopy of CARS, SHG and TPEF has been described in detail previously . An integrated laser system (Newport, Inc.) was built up as the light source for the pump, probe and Stokes beams.…”

Section: Methodsmentioning

confidence: 99%

Biological nascent evolution of snail bone and collagen revealed by nonlinear optical microscopy

Wang

et al. 2019

Journal of Biophotonics

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Using nonlinear optical microscopy of coherent antistokes Raman scattering (CARS), second harmonic generation (SHG) and two-photo excitation fluorescence, we in situ observed how the collagen and the bone grow synergistically and competitively during nascent biological evolution. The sdsCO 2− 3 and PO 2− 3 ions were first observed to be dispersed in the liquid environment, and the collagen was observed 2 days later. With the help of the collagen, the CO 2− 3 and PO 2− 3 ions gradually moved closer to the collagen, and then the bone was produced in the forms of CaCO 3 and CaPO 3 . When the bone was completed with the help of the collagen, the collagen gradually disappeared. The biological evolution of snail bone and collagen can be well revealed by CARS and SHG, and in addition, the biological evolution of structure and morphology can be clearly observed day by day. K E Y W O R D S biological nascent evolution, bone, CARS, collagen, nonlinear optical microscopy, SHG, snail, TPEF

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“…For the SFM-TERS shown in Figure 1d, a metal tip is attached to a high-quality tuning fork as an ultrasensitive feedback system [54,55]. The resulting device is suitable for investigations in aqueous environments as with AFM [56,57], however, more stable tips for SFM are made of metal rather than coated [58,59].…”

Section: Brief History Of Tersmentioning

confidence: 99%

Au Tip-Enhanced Raman Spectroscopy for Catalysis

Wang

Qiao

2018

Applied Sciences

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Plasmon-driven chemical reactions have been a prospective field for surface plasmon resonance and tip-enhanced Raman scattering. In this review, the principles of tip-enhanced Raman spectroscopy (TERS) are first introduced. Following this, the use of Au TERS for plasmon-driven synthesis catalysis is introduced. Finally, the use of Au TERS for catalysis of dissociation reactions is discussed. This review can provide a deeper understanding of Au TERS for plasmon-driven catalysis.

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Optical characterizations of two-dimensional materials using nonlinear optical microscopies of CARS, TPEF, and SHG

Cited by 37 publications

References 31 publications

3D Hotspots Platform for Plasmon Enhanced Raman and Second Harmonic Generation Spectroscopies and Quantitative Analysis

3D Hotspots Platform for Plasmon Enhanced Raman and Second Harmonic Generation Spectroscopies and Quantitative Analysis

Biological nascent evolution of snail bone and collagen revealed by nonlinear optical microscopy

Au Tip-Enhanced Raman Spectroscopy for Catalysis

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