We proposed an internal nanostructure with a high reflective index planarization layer to solve the optical loss due to the
reflective index mismatch between ITO and glass substrate. In our experiments, we found the electrical property of
OLED device was significantly influenced by the internal nanostructures without planarization layer. Moreover, the
internal extraction structure (IES) is not necessarily beneficial for light extraction. Therefore, we proposed a new
substrate combine both internal and external extraction structure (EES) to extract trapping light. We successfully
developed a high refractive index (N~1.7) planarization material with flat surface (RMS roughness < 2 nm), and
improved about 70% device efficiency compared to traditional glass substrate.
In this paper, we present a novel plasmonic substrate for both local preconcentration and surface enhanced Raman
scattering (SERS) detection. The plasmonic substrate is fabricated by nanoimprint process and then overlaid a thin silver
film to adjust the surface plasmon resonance wavelength. Both photothermal conversion and SERS-active wavelength
are designed for He-Ne Laser. The measurement process includes three steps. First of all, local concentration is
performed by laser induced heating on the plasmonic substrate (over 100°C) to create a small bubble in high power mode
(10mW). Then turn off the laser, the target analyte (Rhodamine 6G solution) will concentrate to the center as the bubble
disappeared. Finally, the SERS spectra are taken in low power mode (1mW). The intensity of SERS signal at the
concentrated region is an order of magnitude larger than the untreated region. The repeatability of this preconcentration
process makes it a good candidate to amplify small SERS signals especially for trace detections.
Inducing a large electric field enhancement is very important to have good signals in surface-enhanced Raman scattering
(SERS) experiments. In this study, the nano-scale sliver annular structures have been introduced to design the substrate
for SERS experiment because of its localized surface plasmon (LSP) resonances phenomena. The excited electric field
has been simulated by FDTD (finite-difference time-domain) and the design parameters, such as the thickness of the
metallic film, the inner diameter, and the outer diameter, were changed. The largest electric field happens when the
metallic film thickness is 5 nm and the inner and outer diameters are 0.1 μm and 0.4 μm, respectively. The results are in
good agreement with the theoretical predictions. In addition, the dimer geometry of the annular structures has also been
examined by FDTD to observe the field enhancement. The coupled plasmons effects appear obviously when two
annular structures are very close. It indeed makes the excited electric field in the dimer structure larger than in the single
one for 40 times. In conclusion, a design of dimer constituted with two annular structures which have 0.1 μm and 0.4
μm inner and outer diameters with 0 nm overlap owns the best electric field enhancement property and has great
potential for SERS applications.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.