  Recently, studies have been carried out on attempts to combine
surface-enhanced Surface-enhanced Raman spectroscopy (SERS) substrates that can
be based on either localized surface plasmon (LSP) or surface plasmon
polaritons (SPP) structures. By combining these two systems, the drawbacks of
each other can be solved. However, the manufacturing methods involved so far
are sophisticated, labor-intensive, expensive, and also technically demanding.
We propose a facile method for the fabrication of a flexible plasmonic nanoslit
SERS sensor. We utilized the pattern on periodic optical disks (DVD-R) as a
cheap substitute for printing the periodic pattern on PDMS with soft imprint
lithography. Ag nanoslit (AgNS) was fabricated by serial bideposition using a
dynamic oblique angle deposition (DOD) technique. The nanoslit structures were
physically and optically characterized, and the experimental results were
compared to the numerical simulation studies; Monte Carlo and the
finite-difference time-domain (FDTD) simulation. The Ag nanoslit structure
showed an excellent SERS enhancement, and its biosensing capability was
demonstrated by the sensing of bilirubin.
