10.1021/jp502171k.s001
De-Bo Hu
De-Bo
Hu
Chen Chen
Chen
Chen
Zhi-Mei Qi
Zhi-Mei
Qi
Resonant
Mirror Enhanced Raman Spectroscopy
American Chemical Society
2014
Cyt c
Raman detection
Considerable signal enhancement
Raman emission techniques
Raman analysis
Raman enhancement capability
collection efficiency
Raman radiation
PDM Raman detection ability
Raman spectroscopy
copper phthalocyanine
RMERS
cytochrome c
Raman enhancement effect
ambient conditions
Resonant Mirror Enhanced Raman SpectroscopyA
evanescent field
waveguide surface
ultrathin films
2014-06-19 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Resonant_Mirror_Enhanced_Raman_Spectroscopy/2281413
A resonant
mirror as a high-<i>Q</i> dielectric resonator can accumulate
a strong evanescent field at its surface, and this field has been
proposed for surface/interface Raman enhancement applications for
a while. However, the theoretically predicted large Raman enhancement
effect of a resonant mirror had never been experimentally demonstrated
until our work reported here, primarily due to the difficulties confronting
the experimentalists in determining the resonant conditions for this
optical device and optimizing the collection efficiency of Raman radiation
from molecules at its surface. In this study, taking advantage of
the rationally designed and well-fabricated high-quality planar dielectric
optical waveguides, and overcoming the two difficulties aforementioned
through the use of m-line spectroscopy and waveguide-coupled directional
Raman emission techniques, we present the first experimental demonstration
of resonant mirror enhanced Raman spectroscopy (RMERS). Considerable
signal enhancement that enabled the polarization-division multiplexing
(PDM) Raman detection of copper phthalocyanine (CuPc) ultrathin films
and cytochrome <i>c</i> (Cyt <i>c</i>) monolayer
deposited at the waveguide surface has been achieved. Considering
its high Raman enhancement capability, outstanding PDM Raman detection
ability, and good affordability, RMERS is believed to be a promising
tool for the in situ Raman analysis of analytes on the dielectric
flat surfaces and interfaces under ambient conditions.