AI Article Synopsis
- The study explores how metallic nano-objects, particularly silver nanocolumns, exhibit strong acoustic vibrations in their Raman scattering that are not typically seen in isolated nanoparticles.
- These vibrations are identified as breathing-like acoustic modes and are linked to the unique shape of the nanocolumns, leading to the creation of "acousto-plasmonic hot spots."
- These hot spots result in a significant enhancement of the interaction between the acoustic vibrations and surface plasmons, transforming previously weak vibrations into effective Raman scattering signals.
Article Abstract
We investigate the acousto-plasmonic dynamics of metallic nano-objects by means of resonant Raman scattering and time-resolved femtosecond transient absorption. We observe an unexpectedly strong acoustic vibration band in the Raman scattering of silver nanocolumns, usually not found in isolated nano-objects. The frequency and the polarization of this unexpected Raman band allow us to assign it to breathing-like acoustic vibration modes. On the basis of full electromagnetic near-field calculations coupled to the elasticity theory, we introduce a new concept of "acousto-plasmonic hot spots" which arise here because of the indented shape of the nanocolumns. These hot spots combine both highly localized surface plasmons and strong shape deformation by the acoustic vibrations at specific sites of the nano-objects. We show that the coupling between breathing-like acoustic vibrations and surface plasmons at the "acousto-plasmonic hot spots" is strongly enhanced, turning almost silent vibration modes into efficient Raman scatterers.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/nl901918a | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Evaluation of the importance of sediment organic matter composition for CH production by microcosm tests with and without addition of natural sources (cyanobacterial biomass and riparian pasture) in two subtropical, eutrophic reservoirs.
Environ Sci Pollut Res Int
January 2025
Facultad de Ciencias, Sección Limnología, IECA, Universidad de la República, Montevideo, Uruguay.
The biochemical composition of sediments, which depends on the origin of the organic matter (OM), is decisive in methane (CH) production. This study aimed to determine the CH produced under anaerobic conditions from different substrates: native reservoir sediments and sediments with the addition of complex OM from Microcystis spp. blooms and terrestrial plants (pasture), alongside the biochemical characterization of the substrates used.
View Article and Find Full Text PDFBroadband and large surface enhancements of the local electric field enabled by cross-etched hyperbolic metamaterials.
Nanoscale
January 2025
State Key Laboratory of Optoelectronic Materials and Technologies, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China.
Hyperbolic metamaterials (HMMs) have recently attracted significant research attention due to their hyperbolic wavevector iso-frequency contour, which leads to substantial local electric field (EF) enhancements that benefit optical processes, such as the nonlinear generation, quantum science, biomedical sensing, and more. However, three main challenges hinder their practical implementation: the difficulty in exciting their resonant modes using free-space incidence, the weak enhancement of surface EF, and the narrow spectral range of EF enhancements. Herein, we proposed cross-etched HMMs (CeHMMs) as a novel type of HMM, addressing these issues.
View Article and Find Full Text PDFFabrication of Ag based Surface Enhanced Raman Scattering substrates with periodic mask arrays by electron beam deposition.
Anal Chim Acta
February 2025
Engineering Research Center of Optical Instrument and System, Ministry of Education and Shanghai Key Lab of Modern Optical System, University of Shanghai for Science and Technology, No.516 Jungong Road, Shanghai, 200093, China.
Background: Surface-enhanced Raman scattering (SERS) has attracted much attention as a powerful detection and analysis tool with high sensitivity and fast detection speed. The intensity of the SERS signal mainly depended on the highly enhanced electromagnetic field of nanostructure near the substrate. However, the fabrication of high-quality SERS nanostructured substrates is usually complicated, makes many methods unsuitable for large-scale production of SERS substrates.
View Article and Find Full Text PDFA local shrinkage approach for creating dynamic hot-spots on thermoresponsive nanocellulose-based SERS substrate.
J Colloid Interface Sci
January 2025
College of Light Industry and Food Engineering, Nanjing Forestry University, Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Nanjing 210037 China. Electronic address:
Surface-enhanced Raman scattering (SERS) is a highly sensitive technology to detect target analytes. The construction of dynamic "hot-spots" represents a significant approach to enhancing detection sensitivity. Herein, a hybrid plasma platform with dynamic "hot-spots" was developed for SERS recognition based on the assembly of gold nanospheres (AuNSs) on temperature-sensitive bacterial cellulose (BC) film grafted with poly(N-isopropylacrylamide) (PNIPAM).
View Article and Find Full Text PDFRacial and Geographic Disparities in Colorectal Cancer Incidence and Associated County-Level Risk Factors in Mississippi, 2003-2020: An Ecological Study.
Cancers (Basel)
January 2025
Program in Public Health, Stony Brook Medicine, Stony Brook, NY 11794, USA.
Introduction: Colorectal cancer (CRC) is the third most commonly diagnosed cancer in the United States (U.S.).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!