A Deformable Nanoplasmonic Membrane Reveals Universal Correlations Between Plasmon Resonance and Surface Enhanced Raman Scattering
Emergent scientific significance in designing SERS Nanostructures is described. A quantitative correlation between plasmon resonance and SERS signals is revealed by using a novel “deformable nanoplasmonic membrane”.
Nanoplasmonics has raised much concern on tailoring the strong optical fields near noble metal nanostructures. In particular, surface-enhanced Raman Scattering (SERS) can take the full benefits of nanoplasmonics for providing one of the most highly sensitive biochemical sensing techniques. This sensitivity is used to identify biochemical molecules even at single molecule level. This technique does not require fluorescent labeling. For decades, thousands of plasmonic nanoparticles or nanostructures mounted on substrates have been reported for plasmonics-driven SERS. However, previous work overlooks consideration of the quantitative investigation between plasmon resonance and SERS signals. This oversight has been due to available methodology.
Universal correlations between plasmon resonance and SERS has recently been described by the research of Ki-Hun Jeong (see, Kang et al.1) in Journal Advanced Materials – This observation was successfully enabled by deformable nanoplasmonic membrane, i.e., silver nanoislands on a circular elastomeric membrane. The key to the success of this work lies in both the uniform radial stretch of a circular elastomeric membrane and the size distribution of the silver nanoislands. This combination enables continuous, uniform, and large plasmon shifting suitable for investigating plasmon enhancement in SERS. The authors say that “The individual SERS peaks vary dynamically with the product of extinctions at an excitation and the corresponding Raman scattered wavelengths. The results clearly demonstrate that a single SERS peak has the maximum gain at a specific plasmon resonance wavelength, which has the maximum extinction product of an excitation and the corresponding Raman scattering wavelengths”.
This outstanding report by Kang et al. provides for a clear guideline for further increasing the SERS signals or constructing novel plasmonic nanoparticles or substrates that will facilitate quantitative as well as single molecular SERS.
NOTE: This work has been accepted as a frontispiece for inclusion in the issue of Advanced Materials. A frontispiece is a full-page image placed at the beginning of the article which serves to highlight outstanding results.) In addition, the authors have received the best paper award three times from the Optical Society’s Biochip and Photonics Conference in Korea.
Related article:Minhee Kang et al. Advanced Materials 2014 26: 4510–4514
Figure | Active plasmonics unravels universal correlations between plasmon resonance and surface-enhanced Raman scattering