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Surface‐Enhanced Raman Scattering
Placing a mirror metal underneath the near‐field‐generating optical hotspots with a controlled vertical gap distance, as well as engineered materials, could control the loss/gain of the overall surface‐enhanced Raman scattering (SERS) effect. Article number 2207003 by Inhee Choi, Yong‐Sang Ryu, and co‐workers offers the clue for understanding roles of outer‐medium...
The Fabry–Perot (FP) resonator is an intuitive and versatile optical structure owing to its uniqueness in light‐matter interactions, yielding resonance with a wide range of wavelengths as it couples with photonic materials encapsulated in a dielectric cavity. Leveraging the FP resonator for molecular detection, a simple geometry of the metal‐dielectric‐metal structure is demonstrated to allow tuning...
The assembly of metal nanoparticles and targets to be detected in a small light probe volume is essential for achieving sensitive in‐solution surface‐enhanced Raman spectroscopy (SERS). Such assemblies generally require either chemical linkers or templates to overcome the random diffusion of the colloids unless the aqueous sample is dried. Here, a facile method is reported to produce 3D multiscale...
Controlled assembly of colloidal nanoparticles onto solid substrates generally needs to overcome their thermal diffusion in water. For this purpose, several techniques that are based on chemical bonding, capillary interactions with substrate patterning, optical force, and optofluidic heating of light‐absorbing substrates are proposed. However, the direct assembly of colloidal nanoparticles on generic...
In article number 1803055, Dongchoul Kim, Taewook Kang, Inhee Choi, and co‐workers develop a novel photothermal convection lithography technique for the direct and rapid assembly of colloidal plasmonic nanoparticles on generic substrates. Under resonant light illumination, the colloidal nanoparticles spontaneously move toward the focal point in a photothermally induced convective flow and densely...
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