Raman spectra of polymethyl methacrylate optical fibres excited by a 532 nm diode pumped solid state laser

Thomas, K J; Sheeba, M; Nampoori, V. P. N.; Vallabhan, C. P. G.; Radhakrishnan, P.

doi:10.1088/1464-4258/10/5/055303

Cited by 150 publications

(89 citation statements)

References 14 publications

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“…The energy difference between the excitation and the emission peak is calculated in the wave numbers using the relation ΔE/hc (cm -1 ) = 1/λext -1/λem, where λext and λem are excitation and emission wavelengths respectively. For PMMA, the emission peaks due to excitation wavelengths at 458, 488, 530, and 560 nm nearly match the Raman mode of characteristic peak at 1736 cm -1 of γ (C=O) of (C-COO) mode [47]. Excitations at 380, and 400 nm nearly match with Raman mode of 3454 cm -1 which is 2γ2 overtone of 1730 cm -1 .…”

Section: Methodsmentioning

confidence: 63%

Direct Writing in Polymers with Femtosecond Laser Pulses: Physics and Applications

Deepak¹,

Soma²,

Desai³

2012

Laser Pulses - Theory, Technology, and Applications

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Section: Methodsmentioning

confidence: 63%

Direct Writing in Polymers with Femtosecond Laser Pulses: Physics and Applications

Deepak¹,

Soma²,

Desai³

2012

Laser Pulses - Theory, Technology, and Applications

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“…However, the presence of low-intensity D band (1355 cm -1 ), originating from disordered carbon atoms in A 0 1 symmetry [27], indicates the small number of structural defects introduced into the graphene sample. No bands corresponded to PMMA (the most intensive are 1460, 1736 and 2957 cm -1 ) [28] were observed in this Raman spectrum proving no contamination of the transferred graphene with polymer residues. Figure 3b, c show SEM images of bismuth selenide nanostructures, deposited on monolayer CVD graphene substrate as a result of two-stage synthesis.…”

Section: Methodsmentioning

confidence: 72%

Vapor–solid synthesis and enhanced thermoelectric properties of non-planar bismuth selenide nanoplates on graphene substrate

et al. 2016

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In this work, stoichiometric separate bismuth selenide (Bi 2 Se 3 ) nanoplates and continuous Bi 2 Se 3 coatings are synthesized on graphene substrate by catalystfree vapor-solid deposition method. The orientation of synthesized nanoplates relative to the substrate surface varies from heteroepitaxial (planar) to oriented under different angles (non-planar). The non-planar growth of the nanoplates was achieved for the first time by short-term carrier inert gas flow in certain temperature interval of the synthesis process. The crystallographic growth directions of non-planar nanoplates were determined from HRTEM images as well as estimated from the slope angles of non-planar nanoplates. Bi 2 Se 3 coatings consisting of combination of planar and non-planar nanoplates exhibit significantly enhanced in comparison with coating consisting of only planar coalescent Bi 2 Se 3 nanoplates thermoelectric properties. Demonstrated graphene/Bi 2 Se 3 /graphene devices may find applications in thermoelectric and photo-detection sensors.

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“…These could only be partly corrected by the background, due to its specific nature discussed below. We connect the structure in the range 1730-1740 cm −1 to Perspex, the material of the holder of the chip, of which the spectrum shows a peak at 1736 cm −1 [22]. The residual structures at 1900 and 1960 cm −1 , clearly present in both the raw spectra and the background, so far remain unidentified, although we note that they occur in the range of Raman signatures of hydrocarbon chains.…”

Section: Raman Spectroscopymentioning

confidence: 93%

On-chip optical trapping and Raman spectroscopy using a TripleX dual-waveguide trap

Boerkamp¹,

Leest²,

Heldens³

et al. 2014

Opt. Express

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We present a new approach to the dual-beam geometry for onchip optical trapping and Raman spectroscopy, using waveguides microfabricated in TripleX technology. Such waveguides are box shaped and consist of SiO 2 and Si 3 N 4 , so as to provide a low index contrast with respect to the SiO 2 claddings and low loss, while retaining the advantages of Si 3 N 4 . The waveguides enable both the trapping and Raman functionality with the same dual beams. Polystyrene beads of 1 µm diameter can be easily trapped with the device. In the axial direction discrete trapping positions occur, owing to the intensity pattern of the interfering beams. Trapping events are interpreted on the basis of simulated optical fields and calculated optical forces. The average transverse trap stiffness is 0.8 pN/nm/W, indicating that a strong trap is formed by the beams emitted by the waveguides. Finally, we measure Raman spectra of trapped beads for short integration times (down to 0.25 s), which is very promising for Raman spectroscopy of microbiological cells.

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Raman spectra of polymethyl methacrylate optical fibres excited by a 532 nm diode pumped solid state laser

Cited by 150 publications

References 14 publications

Direct Writing in Polymers with Femtosecond Laser Pulses: Physics and Applications

Direct Writing in Polymers with Femtosecond Laser Pulses: Physics and Applications

Vapor–solid synthesis and enhanced thermoelectric properties of non-planar bismuth selenide nanoplates on graphene substrate

On-chip optical trapping and Raman spectroscopy using a TripleX dual-waveguide trap

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