The Calculation of the Evanescent Wave and the Coupling Coefficient of the Whispering-Gallery-Mode Disk Microcavity

2007 ◽  
Vol 121-123 ◽  
pp. 1375-1378
Author(s):  
Xiao Qin Wang ◽  
Qing Zhou ◽  
Jun Ying Zeng ◽  
Xiao Yun Pu ◽  
Xing Zhu
Keyword(s):  
Coupling Coefficient ◽  
Evanescent Wave ◽  
Near Field ◽  
Volume Ratio ◽  
Whispering Gallery Mode ◽  
Whispering Gallery ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Mode Volume

Ultrahigh-Quality microcavity with whispering-gallery-mode (WGM) is a new kind of resonator with high quality. The evanescent wave of WGM plays an important role in surface enhanced Raman scattering (SERS). In this paper we study the relationship between coupling coefficient and evanescent wave of the WGM and the coupling character difference between the microsphere and the microstadium. Based on the finite-difference time-domain (FDTD), we calculate the coupling coefficient of different substances (water, C2H5OH, CHCL3, olive oil, C6H6 and CS2) with different dielectric constant and the mode volume ratio of the evanescent wave in microsphere and microstadium of the above substances in near field. The results show that (1) the mode volume ratio of evanescent wave will decrease with the increasing of the coupling coefficient; (2) the microstadium has a higher coupling coefficient than the sphere one.

Surface enhanced Raman scattering in whispering gallery mode microresonators

2017 ◽  
Author(s):  
Steven H. Huang ◽  
Xuefeng Jiang ◽  
Corey Janisch ◽  
Alexander Cocking ◽  
Zhiwen Liu ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Whispering Gallery Mode ◽  
Surface Enhanced Raman Scattering ◽  
Whispering Gallery ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Surface-enhanced Raman scattering on dielectric microspheres with whispering gallery mode resonance

2018 ◽  
Vol 6 (5) ◽  
pp. 346 ◽  
Author(s):  
Steven H. Huang ◽  
Xuefeng Jiang ◽  
Bo Peng ◽  
Corey Janisch ◽  
Alexander Cocking ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Whispering Gallery Mode ◽  
Surface Enhanced Raman Scattering ◽  
Whispering Gallery ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

High resolution scanning near field mapping of enhancement on SERS substrates: comparison with photoemission electron microscopy

2016 ◽  
Vol 18 (14) ◽  
pp. 9405-9411 ◽  
Author(s):  
C. Awada ◽  
J. Plathier ◽  
C. Dab ◽  
F. Charra ◽  
L. Douillard ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Near Field ◽  
Spectroscopic Technique ◽  
Proof Of Concept ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Photoemission Electron

The need for a dedicated spectroscopic technique with nanoscale resolution to characterize SERS substrates pushed us to develop a proof of concept of a functionalized tip–surface enhanced Raman scattering (FTERS) technique.

scholarly journals Improving SERS Detection of Bacillus thuringiensis Using Silver Nanoparticles Reduced with Hydroxylamine and with Citrate Capped Borohydride

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Hilsamar Félix-Rivera ◽  
Roxannie González ◽  
Gabriela Del Mar Rodríguez ◽  
Oliva M. Primera-Pedrozo ◽  
Carlos Ríos-Velázquez ◽  
...  
Keyword(s):  
Bacillus Thuringiensis ◽  
Surface Charge ◽  
Near Field ◽  
Medical Diagnostics ◽  
Biological Warfare Agents ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Sers Detection ◽  
Warfare Agents ◽  
Enhanced Raman Scattering

The development of techniques that could be useful in fields other than biological warfare agents countermeasures such as medical diagnostics, industrial microbiology, and environmental applications have become a very important subject of research. Raman spectroscopy can be used in near field or at long distances from the sample to obtain fingerprinting information of chemical composition of microorganisms. In this research, biochemical components of the cell wall and endospores of Bacillus thuringiensis (Bt) were identified by surface-enhanced Raman scattering (SERS) spectroscopy using silver (Ag) nanoparticles (NPs) reduced by hydroxylamine and borohydride capped with sodium citrate. Activation of “hot spots”, aggregation and surface charge modification of the NPs, was studied and optimized to obtain signal enhancements from Bt by SERS. Slight aggregation of the NPs as well as surface charge modification to a more acidic ambient was induced using small-size borohydride-reduced NPs in the form of metallic suspensions aimed at increasing the Ag NP-Bt interactions. Hydroxylamine-reduced NPs required slight aggregation and no pH modifications in order to obtain high spectral quality results in bringing out SERS signatures of Bt.

Surface-enhanced Raman scattering (SERS) as probe of plasmonic near-field resonances

2018 ◽  
Vol 99 ◽  
pp. 34-43 ◽  
Author(s):  
Adriana Santinom ◽  
Mateus A. da Silva ◽  
Javier E.L. Villa ◽  
Ronei J. Poppi ◽  
Italo O. Mazali ◽  
...  
Keyword(s):  
Raman Scattering ◽  
Near Field ◽  
Surface Enhanced Raman Scattering ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering

Near Field Optical Properties of Individual Ag Nanowire Dimers Encapsulated by Dielectric Layers

2011 ◽  
Vol 393-395 ◽  
pp. 193-196
Author(s):  
Song Lin Jin ◽  
Chao Ling Du ◽  
Da Ning Shi
Keyword(s):  
Optical Properties ◽  
Near Field ◽  
Peak Wavelength ◽  
Electromagnetic Enhancement ◽  
Dielectric Layers ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Enhanced Raman Scattering ◽  
Two Parameters ◽  
Ag Nanowire

By finite element method (FEM), the near field optical properties of an individual Ag nanowire dimer encapsulated with nanometric dielectric layers were investigated. We demonstrated that the electromagnetic enhancement could be optimized by improving the substrates’ refractive index and the thickness, and gave the peak wavelength as a function of the two parameters separately. The results are important for further understanding surface-enhanced Raman Scattering (SERS) and have referential meaning for choosing the appropriate substrates in the application.

Sign in / Sign up

Export Citation Format

Share Document