Plasmofluidic single-molecule surface-enhanced Raman scattering from dynamic assembly of plasmonic nanoparticles
Partha Pratim Patra,Rohit Chikkaraddy,Ravi P. N. Tripathi,Arindam Dasgupta,G. V. Pavan Kumar +4 more
TLDR
By utilizing dual excitation of plasmons at metal-fluid interface, this work creates interacting assemblies of metal nanoparticles, which may be further harnessed in dynamic lithography of dispersed nanostructures and have implications in realizing optically addressable, plasmofluidic, single-molecule detection platforms.Abstract:
Single-molecule surface-enhanced Raman scattering (SM-SERS) is one of the vital applications of plasmonic nanoparticles. The SM-SERS sensitivity critically depends on plasmonic hot-spots created at the vicinity of such nanoparticles. In conventional fluid-phase SM-SERS experiments, plasmonic hot-spots are facilitated by chemical aggregation of nanoparticles. Such aggregation is usually irreversible, and hence, nanoparticles cannot be re-dispersed in the fluid for further use. Here, we show how to combine SM-SERS with plasmon polariton-assisted, reversible assembly of plasmonic nanoparticles at an unstructured metal–fluid interface. One of the unique features of our method is that we use a single evanescent-wave optical excitation for nanoparticle assembly, manipulation and SM-SERS measurements. Furthermore, by utilizing dual excitation of plasmons at metal–fluid interface, we create interacting assemblies of metal nanoparticles, which may be further harnessed in dynamic lithography of dispersed nanostructures. Our work will have implications in realizing optically addressable, plasmofluidic, single-molecule detection platforms. Plasmonic hot-spot generation in solution is not reversible for single-molecule surface-enhanced Raman scattering, which limits its applications. Patra et al.tackle this problem by integrating this technique with thermo-plasmon-assisted reconfiguration of nanoparticles at a metal–fluid interface.read more
Citations
More filters
Journal ArticleDOI
Structural and compositional changes of dissolved organic matter upon solid-phase extraction tracked by multiple analytical tools
TL;DR: Findings shed new light on potential changes in the compound composition and the molecular weight of DOM upon the SPE, implying precautions needed for data interpretation.
Journal ArticleDOI
Tailoring photoluminescence of monolayer transition metal dichalcogenides
TL;DR: In this paper, basic exciton properties and the impacts of charged doping, strain, dielectric screening, temperature and excitation intensity on excitonic behaviors reflected via photoluminescence spectra for monolayer of TMDs are reviewed.
Journal ArticleDOI
Optimal design of acoustic metamaterial cloaks under uncertainty
TL;DR: This work develops a computational approach based on a Taylor approximation and an approximate Newton method for optimization that is scalable with respect to the dimension of both the design variables and uncertain parameters, and applies the method to a deterministic large-scale optimal cloaking problem with complex geometry.
Journal ArticleDOI
Additive-manufactured hierarchical multi-circular lattice structures for energy absorption application
TL;DR: In this paper, a hierarchical lattice design is proposed by replacing the original straight beams of face-centered cubic lattice with a string of higher-level circular beams from the perspective of forming more plastic hinges to improve the energy absorption capacity.
Journal ArticleDOI
Stress relaxation in a nickel-base superalloy at elevated temperatures with in situ neutron diffraction characterization: Application to additive manufacturing
TL;DR: In this article, the stress relaxation behavior and mechanisms of conventionally processed and additively manufactured Inconel 625 (CP-IN625) at 600 and 700°C were investigated via compression tests up to an engineering strain of 9% with in situ neutron diffraction characterization.
References
More filters
Journal ArticleDOI
Optical Constants of the Noble Metals
P. B. Johnson,R. W. Christy +1 more
TL;DR: In this paper, the optical constants for the noble metals (copper, silver, and gold) from reflection and transmission measurements on vacuum-evaporated thin films at room temperature, in the spectral range 0.5-6.5 eV.
Journal ArticleDOI
Surface plasmon subwavelength optics
TL;DR: By altering the structure of a metal's surface, the properties of surface plasmons—in particular their interaction with light—can be tailored, which could lead to miniaturized photonic circuits with length scales that are much smaller than those currently achieved.
Journal ArticleDOI
Probing Single Molecules and Single Nanoparticles by Surface-Enhanced Raman Scattering
Shuming Nie,Steven R. Emory +1 more
TL;DR: In this article, surface-enhanced Raman scattering was used to detect single molecules and single nanoparticles at room temperature with the use of surface enhanced Raman, and the intrinsic Raman enhancement factors were on the order of 10 14 to 10 15, much larger than the ensemble-averaged values derived from conventional measurements.
Journal ArticleDOI
Single Molecule Detection Using Surface-Enhanced Raman Scattering (SERS)
Katrin Kneipp,Katrin Kneipp,Yang Wang,Yang Wang,Harald Kneipp,Harald Kneipp,Lev T. Perelman,Lev T. Perelman,Irving Itzkan,Irving Itzkan,Ramachandra R. Dasari,Ramachandra R. Dasari,Michael S. Feld,Michael S. Feld +13 more
TL;DR: In this article, the first observation of single molecule Raman scattering was made using a single crystal violet molecule in aqueous colloidal silver solution using one second collection time and about $2.
Journal ArticleDOI
Biosensing with plasmonic nanosensors
TL;DR: This paper introduces the localized surface plasmon resonance (LSPR) sensor and describes how its exquisite sensitivity to size, shape and environment can be harnessed to detect molecular binding events and changes in molecular conformation.