Tip‐enhanced spectroscopy of 2D black phosphorus

Gao, Man; Sun, Mengtao; Meng, Lingyan

doi:10.1002/jrs.5610

Cited by 14 publications

(14 citation statements)

References 51 publications

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“…Figure 4B and D shows stronger field enhancement and localization due to the substrate effect, as we discussed earlier. Based on this feature, the side-illumination geometry is generally used for TERS [93][94][95][96] and TEPL [20] experiments. Some research groups use the bottomillumination geometry to measure transparent samples [53,97].…”

Section: Field Enhancement In Plasmonic Tipsmentioning

confidence: 99%

Tip-enhanced photoluminescence nano-spectroscopy and nano-imaging

Lee

Kang

et al. 2020

Nanophotonics

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AbstractPhotoluminescence (PL), a photo-excited spontaneous emission process, provides a wealth of optical and electronic properties of materials, which enable microscopic and spectroscopic imaging, biomedical sensing and diagnosis, and a range of photonic device applications. However, conventional far-field PL measurements have limitations in sensitivity and spatial resolution, especially to investigate single nano-materials or nano-scale dimension of them. In contrast, tip-enhanced photoluminescence (TEPL) nano-spectroscopy provides an extremely high sensitivity with <10 nm spatial resolution, which allows the desired nano-scale characterizations. With outstanding and unique optical properties, low-dimensional quantum materials have recently attracted much attention, and TEPL characterizations, i. e., probing and imaging, and even control at the nano-scale, have been extensively studied. In this review, we discuss the fundamental working mechanism of PL enhancement by plasmonic tip, and then highlight recent advances in TEPL studies for low-dimensional quantum materials. Finally, we discuss several remaining challenges of TEPL nano-spectroscopy and nano-imaging, such as implementation in non-ambient media and in situ environments, limitations in sample structure, and control of near-field polarization, with perspectives of the approach and its applications.

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Section: Field Enhancement In Plasmonic Tipsmentioning

confidence: 99%

Tip-enhanced photoluminescence nano-spectroscopy and nano-imaging

Lee

Kang

et al. 2020

Nanophotonics

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“…It has been established that semiconductor materials play a significant role in the far‐ and near‐field properties of the studied system a, only one SPR peak can be found in the range from 500 to 750 nm when the coating material is graphene.…”

Section: Resultsmentioning

confidence: 99%

“…It has been established that semiconductor materials play a significant role in the far-and near-field properties of the studied system. [34,35] As shown in Figure 3a, only one SPR peak can be found in the range from 500 to 750 nm when the coating material is graphene. The Ag/graphene core-shell nanoparticles present larger scattering intensity but smaller electric field enhancement than that of bare Ag nanoparticle (Figure 3a,b).…”

Section: Theoretical Model and Methodsmentioning

confidence: 99%

Plexciton for surface enhanced Raman scattering and emission

Feng

Gao

Wang

et al. 2019

J Raman Spectroscopy

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Plexcitons are polaritonic modes that result from coherently coupled plasmons and excitons. Far‐ and near‐field properties of Ag/semiconductor core–shell nanoparticles on silica‐coated silver substrate were theoretically studied, using finite‐difference time‐domain method. Our calculations suggested that titanium dioxide (TiO2) would be a better coating material, useful for the design of high‐sensitive surface enhanced Raman scattering (SERS) substrate. The calculated Raman enhancement factor could be turned to as high as 4.0 × 1010 under the 633‐nm laser excitation. Surface plasmon‐coupled emission of SERS reveals an optimal collection angle of 5°, which shows a huge back scattering of the studied system. Our theoretical results could be used as a reference for the experimental design of semiconductor‐based SERS substrate with high efficiency.

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“…210 While experimental studies in near-field spectroscopy in BP are not available yet, a recent calculation predicted enhancement factors up to 10 8 and 10 3 for Raman and PL, respectively, in BP by using a 3D finite-difference time-domain method (Figure 4I). 211 Still, investigation on BP is in the early stages.…”

Section: Near-field Spectroscopy Study On 2d Materialsmentioning

confidence: 99%

Exciton–Photonics: From Fundamental Science to Applications

Anantharaman

Jariwala

2021

ACS Nano

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Semiconductors in all dimensionalities ranging from 0D quantum dots and molecules to 3D bulk crystals support bound electron-hole pair quasiparticles termed as excitons. Over the past two decades, the emergence of a variety of low-dimensional semiconductors that support excitons combined with advances in nano-optics and photonics has burgeoned a new area of research that focuses on engineering, imaging, and modulating coupling between excitons and photons, resulting in the formation of hybrid-quasiparticles termed exciton-polaritons. This new area has the potential to bring about a paradigm shift in quantum optics, as well as classical optoelectronic devices. Here, we present a review on the coupling of light in excitonic semiconductors and investigation of the unique properties of these hybrid quasiparticles via both farfield and near-field imaging and spectroscopy techniques. Special emphasis is laid on recent advances with critical evaluation of the bottlenecks that plague various materials towards practical device implementations including quantum light sources.Our review highlights a growing need for excitonic materials development together with optical engineering and imaging techniques to harness the utility of excitons and their host materials for a variety of applications.

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Tip‐enhanced spectroscopy of 2D black phosphorus

Cited by 14 publications

References 51 publications

Tip-enhanced photoluminescence nano-spectroscopy and nano-imaging

Tip-enhanced photoluminescence nano-spectroscopy and nano-imaging

Plexciton for surface enhanced Raman scattering and emission

Exciton–Photonics: From Fundamental Science to Applications

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