Autoenhanced Raman Spectroscopy via Plasmonic Trapping for Molecular Sensing

Hong, Suk-In; Shim, On; Kwon, Hyosung; Choi, Yeonho

doi:10.1021/acs.analchem.6b01451

Cited by 32 publications

(26 citation statements)

References 43 publications

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“…Through the use of hotspots excited in the nanogaps, it was possible to detect the SERS signal at low concentrations (Fig. 15a) 295 . These random nanogaps have a three-dimensional distribution in space, although plasmonic structures for trapping are fabricated based on quasi-two-dimensional structures.…”

Section: Raman Spectroscopymentioning

confidence: 99%

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Plasmonic tweezers: for nanoscale optical trapping and beyond

et al. 2021

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Optical tweezers and associated manipulation tools in the far field have had a major impact on scientific and engineering research by offering precise manipulation of small objects. More recently, the possibility of performing manipulation with surface plasmons has opened opportunities not feasible with conventional far-field optical methods. The use of surface plasmon techniques enables excitation of hotspots much smaller than the free-space wavelength; with this confinement, the plasmonic field facilitates trapping of various nanostructures and materials with higher precision. The successful manipulation of small particles has fostered numerous and expanding applications. In this paper, we review the principles of and developments in plasmonic tweezers techniques, including both nanostructure-assisted platforms and structureless systems. Construction methods and evaluation criteria of the techniques are presented, aiming to provide a guide for the design and optimization of the systems. The most common novel applications of plasmonic tweezers, namely, sorting and transport, sensing and imaging, and especially those in a biological context, are critically discussed. Finally, we consider the future of the development and new potential applications of this technique and discuss prospects for its impact on science.

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Section: Raman Spectroscopymentioning

confidence: 99%

“…In plasmonic traps, hotspots are formed at trap positions, and any trapped molecules can be collected for qualitative and quantitative analysis 295 . As shown in Fig.…”

Section: Sensing and Imagingmentioning

confidence: 99%

Plasmonic tweezers: for nanoscale optical trapping and beyond

et al. 2021

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“…In Fig. 8, Hong and colleagues [99] showed a new technology for trapping "hot spots" by combining SERS with plasma (Fig. 8a).…”

Section: Noble Metal Nanostructures For Sersmentioning

confidence: 99%

Recent progress in periodic patterning fabricated by self-assembly of colloidal spheres for optical applications

Liu

Zhang

et al. 2020

Sci. China Mater.

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Colloidal crystals are periodically ordered arrays of monodisperse colloidal particles which represent a new class of self-assembled materials showing potential applications in many fields. Two-dimensional graphic nanostructures based on colloidal crystals have inherent periodicity from tens of nanometers to several micrometers, which gives them rich and interesting optical properties. This article presents a comprehensive review about the current research activities on the self-assembly of colloidal spheres which is an effective strategy for fabrication of various hierarchical and ordered nanostructures, with particular attention paid to the unique properties and applications of the colloidal crystal-based nanostructures. Three main aspects are elaborated: a) controllable self-assembly of colloidal crystals; b) the functions of the obtained colloidal spheres acting as the patterned mask for successive construction of numerous nanostructures; c) the novel properties and promising optical applications of the patterned nanostructures in various domains, such as plasmonic-related fields, antireflection, photonic crystals, photocatalysis and electronic devices. After that, the current challenges and future perspectives in this area are provided. This review aims to inspire more ingenious designs and exciting research for manufacturing nanostructures utilizing colloidal self-assembly.

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“…SERS can enhance the subtle Raman scattering signal by an electromagnetic field in a nanogap between metallic nanostructures. [ 5 ] Among the SERS approaches, direct SERS is the simplest because it detects the intrinsic Raman signal of analytes without indispensable tagging procedures. [ 6 ] Moreover, the direct SERS is widely known to be an ultrasensitive method capable of femtomolar detection.…”

Section: Introductionmentioning

confidence: 99%