Fluorescence of Natural and Synthetic Gem Diamond: Mechanism and Applications

Breeding, Christopher M.; Eaton-Magaña, Sally

doi:10.1002/9780470027318.a9670

Cited by 5 publications

(6 citation statements)

References 69 publications

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“…In comparison, C TERS in the direct-illumination mode was expected to be only within the range of 1.8 × 10 –3 –1.5 × 10 –2 , assuming that the values of the incident laser power and TERS signal being generated by the near-field component were the same as those for the indirect-illumination case. Considering the strong fluorescence interference from the synthetic diamond and far-field Raman signal, the TERS signal produced by direct illumination should be difficult to separate from the far-field background.…”

Section: Resultsmentioning

confidence: 99%

Low-Background Tip-Enhanced Raman Spectroscopy Enabled by a Plasmon Thin-Film Waveguide Probe

et al. 2021

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Tip-enhanced Raman spectroscopy (TERS) is a nano-optical approach to extract spatially resolved chemical information with nanometer precision. However, in the case of direct-illumination TERS, which is often employed in commercial TERS instruments, strong fluorescence or far-field Raman signals from the illuminated areas may be excited as a background. They may overwhelm the near-field TERS signal and dramatically decrease the near-field to far-field signal contrast of TERS spectra. It is still challenging for TERS to study the surface of fluorescent materials or a bulk sample that cannot be placed on an Au/Ag substrate. In this study, we developed an indirect-illumination TERS probe that allows a laser to be focused on a flat interface of a thin-film waveguide located far away from the region generating the TERS signal. Surface plasmon polaritons are generated stably on the waveguide and eventually accumulated at the tip apex, thereby producing a spatially and energetically confined hotspot to ensure stable and high-resolution TERS measurements with a low background. With this thin-film waveguide probe, TERS spectra with obvious contrast from a diamond plate can be acquired. Furthermore, the TERS technique based on this probe exhibits excellent TERS signal stability, a long lifetime, and good spatial resolution. This technique is expected to have commercial potential and enable further popularization and development of TERS technology as a powerful analytical method.

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Section: Resultsmentioning

confidence: 99%

Low-Background Tip-Enhanced Raman Spectroscopy Enabled by a Plasmon Thin-Film Waveguide Probe

et al. 2021

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“…The excitation time taken by the molecules of diamond leads to the change in color caused by fluorescence [14]. The Figure 3 shows the fluorescence and phosphorescence imaging of natural diamonds and LGD's.…”

Section: Fluorescence and Phosphorescence Imagingmentioning

confidence: 99%

Raman Photoluminescence - An Efficient way to distinguish Natural diamonds and Lab Grown diamonds

Kumar¹,

Prabavathy²,

Biswal³

2022

IOP Conf. Ser.: Mater. Sci. Eng.

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The advancements in Science and Technology introduced Lab grown diamonds (LGDs) that meet with diverse applications. The LGD’s possess similar electrical, optical and mechanical characteristics compared to natural diamonds mined from earth. There is a possibility of LGDs infiltration in the Natural diamond pipeline in the jewellery industry. Hence, it becomes crucial to detect LGDs. The present article illustrates the importance of Raman Photoluminescence over absorption spectroscopy and Fluorescence/Phosphorescence imaging for identification of diamond nature. In the current work, a single Laser source of 532 nm was used to obtain the distinct molecular information of Natural diamonds and Lab Grown diamonds.

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“…Many articles about various aspects of diamond grading have been published regarding color grading (King et al, 2006(King et al, , 2008, cutting decisions (Caspi, 1997), cut grading of round brilliants (Hemphill et al, 1998;Moses et al, 2004), symmetry (Geurts et al, 2011), crystal inclusions (Koivula, 2000;Kaminsky et al, 2000;Shirey and Shigley, 2013;Smith et al, 2016;Renfro et al, 2018), trends exclusively seen in large diamonds (Smith et al, 2017), and fluorescence (Moses et al, 1997;Luo and Breeding, 2013;Bouman et al, 2018;Breeding and Eaton-Magaña, 2019). Recounting the specifics of the grading process or the mechanics of fluorescence observations is beyond the scope of this article.…”

Section: In Briefmentioning

confidence: 99%