A Novel Surface-Enhanced Raman Scattering Sample Cell

With the improvement of the detection of the weak signal, laser technology and computer used in the field of spectroscopy, the Raman spectroscopy apply in many domains, and the according techniques, such as the detection technology of Resonance Raman, Fourier Transfer Raman, Confocal Raman microscopy, as well as surface-enhance Raman spectrum (SERS), improve significantly the sensitivity and the ratio of signal to noise of Raman spectrum. In recent years, we pay more attention to SERS. The technology with a high Raman signal enhancement as well as high sensitivity to physical and chemical, biological medicine, material the field occupies a pivotal position.This paper concentrates on application of SERS, a novel enhanced Raman sample cell is brought out, the numerical simulations and experiment test are carried out, too. Detection of R6G with low concentration by a novel SERS sample cell is the main contents in the experiment test. Through the comparison of single silver colloid as substrate by detection of R6G, we achieve that the novel SERS sample cell is a high effect surfaced-enhanced Raman substrate, and we introduce it by three parts.Firstly, we introduce the basic theory and the development of Raman spectroscopy are in this paper. Raman spectroscopy is a kind of spectrum method in study of molecular vibration and rotation; As the fingerprint spectra of the characterization of molecular vibrational levels, the technology apply to physical and chemical, biological medicine, material the field. With the development of Surface-Enhanced Raman Spectroscopy, Raman spectroscopy has gradually been used for the detection of the liquid sample.Secondly, the structure and fabrication procedure of the novel enhanced Raman sample cell is introduced. We achieve silver colloid by microwave heated method. The Single-mode optical fiber is modified by L-cysteine. Then, the Single-mode optical fiber is kept in the silver colloids for24h. Last, put the optical fiber in capillary tube which is full of silver colloid, shape the model with silver nanoparticles around coating optical fiber? The metallic nanostructure not only can produce the conventional "hot spots", but also produce a kind of unusual "hot spots" because of the formation of electronic circuits, with the increasing of the "hot spots", the sensitivity of Raman detection signal can greatly improve. At the same time, we acquire SERS of low concentration of R6G by the novel sample cell.Lastly, the numerical simulations of the enhancement distribution of the silver nanoparticles with the random shape under the excitation is executed with Finite-Difference Time-Domain (FDTD), and the electromagnetic enhancement effect of silver colloid nanoparticles surface-enhanced Raman scattering effect is analyzed.