2018
DOI: 10.1021/acsphotonics.8b01136
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Giant Chemical Surface Enhancement of Coherent Raman Scattering on MoS2

Abstract: Raman spectroscopy is a powerful tool for molecular chemical analysis and bioimaging, which shows an astonishing sensitivity when combined with a huge enhancement by the coherence and surface effects. Noble metal nanoparticles have been commonly used for the spontaneous surface-enhanced Raman scattering (SERS) and for the surface-enhanced coherent anti-Stokes Raman scattering (SECARS) spectroscopies, as they provide large enhancement factors via the electromagnetic and chemical mechanisms. Recently, two-dimens… Show more

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Cited by 29 publications
(27 citation statements)
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“…The presence of a direct excitonic transition 32 in MoS 2 allows for the enhancement of nonlinear optical phenomena, making it an attractive candidate as a substrate for optical studies. MoS 2 nanoparticles in solution have also been used to enhance nonlinear optical phenomena as they were employed to enhance the coherent anti-Stokes Raman scattering intensity of the surrounding pyridine medium, with a calculated nine orders of magnitude enhancement of the Raman excitation 33 . MoS 2 is also nontoxic in bulk form, shown previously by Weng et al 34 , making it suitable for optical study of biological samples.…”
mentioning
confidence: 99%
“…The presence of a direct excitonic transition 32 in MoS 2 allows for the enhancement of nonlinear optical phenomena, making it an attractive candidate as a substrate for optical studies. MoS 2 nanoparticles in solution have also been used to enhance nonlinear optical phenomena as they were employed to enhance the coherent anti-Stokes Raman scattering intensity of the surrounding pyridine medium, with a calculated nine orders of magnitude enhancement of the Raman excitation 33 . MoS 2 is also nontoxic in bulk form, shown previously by Weng et al 34 , making it suitable for optical study of biological samples.…”
mentioning
confidence: 99%
“…31 The A 1g mode at 707 and 1071 cm À1 were ascribed to the icosahedral breathing modes of the B 4 C. 32 For MoS 2 , the peak at 378 cm À1 corresponded to 2g vibrational mode, which involved in-layer vibration of Mo and S atoms; and the 403 cm À1 peak represented A 1g vibrational mode, which revealed the out-of layer vibrations of S atoms along the c axis. 33,34 As for the B 4 C-PDA/PEI and B 4 C@MoS 2 , there were two wide peaks about 1375 and 1590 cm À1 , which corresponding to the stretching vibrations of indole and pyrrole rings in PDA. 35 Both of the peaks about B 4 C-PDA/PEI and MoS 2 could also be discovered in Raman curve of B 4 C@MoS 2 hybrid, indicating the B 4 C@MoS 2 hybrid was exactly prepared.…”
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confidence: 98%
“…This is particularly important for plasmon-enhanced nonlinear light–matter interactions involving coherent interaction of multiple beams at different frequencies. Coherent anti-Stokes Raman scattering (CARS) is one such nonlinear light–matter interaction. In the simplest case of two-color CARS, coherent interaction of two input beams at the frequencies of the pump and the Stokes results in one output beam at the anti-Stokes frequency. In a classical model, the enhancement in the CARS signal compared to spontaneous Raman scattering is due to the coherent enhancement, i.e.…”
mentioning
confidence: 99%
“…, the coherent population of molecules to a specific vibrational state defined by the energy difference between the pump and Stokes beams . In addition to this coherent enhancement effect, the CARS signal can be further increased by chemical enhancement of the substrate and surface enhancement effect from random or well-designed nanostructures. , , In this work, we focus on the surface enhancement effect of the plasmonic nanostructures in surface-enhanced coherent anti-Stokes Raman scattering (SECARS). The coherent enhancement and chemical enhancement involved in the CARS process are not directly relevant to the main observation and thus not discussed in this work.…”
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confidence: 99%