The escalating concern about ohmic losses in metal-dependent
plasmonics
demands more effective material fabrication for the development of
biosensing frameworks. The omnidirectionality and low signal collection
efficiency of a conventional fluorescence-based detection platform
make it challenging to realize better sensitivity for real-time point-of-care
diagnostics. In an attempt to address these demands, recently a photonic
crystal-coupled emission (PCCE) platform has been demonstrated to
outperform the well-established surface plasmon-coupled emission platform
for biophysicochemical sensing applications. The effects of the different
numbers of bilayers (BLs) of a one-dimensional photonic crystal (1DPhC)
on the electric field intensity of Bloch surface waves and internal
optical modes (IOMs) are extensively studied in this work to improve
the performance of the PCCE platform rationally. Specifically, the
1DPhC with 10 BLs presented 55-fold PCCE enhancements because of the
strong field confinement by the IOMs and small losses. In addition,
the critical role of nanoengineering graphene oxide π-plasmon
and silver nanowires on the PCCE platform has been explored to yield
an unprecedented >1300-fold increase in fluorescence intensity.
The
amplified PCCE enhancements obtained with the first experimental evidence
of the synergism among dielectric plasmons (1DPhC), graphene oxide
plasmons, and metal plasmons (from silver nanowires) have been utilized
to sense cholesterol at the single-molecule limit of detection. The
photoplasmonic sensor presented here exhibits potential utility in
academia and industry and provides a perspective for combining materials
at nanoregimes for the desired applications.
The optical Tamm mode-aided amplified spontaneous emission in a super-Tamm structure consisting of a silver (Ag) thin film deposited on dye-doped polyvinyl alcohol (PVA) layer coated on a SiO2/TiO2 one-dimensional photonic crystal structure is presented.
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