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Metallic nanobowtie is well known as a suitable structure for development of antennas that can be integrated on wide
number of devices, especially in optical communications. Such feature is achieved due the presence of surface plasmon
polariton (SPP) that provides a great charge density on nearby region from its tips. Considerable studies have described
theoretical and experimentally the influence of gap between tips on radiation emission, once this parameter may improve
the local field, as such length decrease. In optical regime, the emission enhancement is due the quantum-plasmonic
interaction created from tips’ region (localized field) and the transition levels from rare earth ion of erbium (Er3+) and
thulium (Tm3+). However, metallic nanobowtie with absence of gap still deserve attention, because in addition to present
similar properties from regular case as previously mentioned, can also interacts with different systems, like gain
materials, that can be embedded thermically into the substrate. Rare earth ion is one of the remarkable and suitable for
our proposition, not only for the enhancement on measured intensity, but also its easiness to implement it on glasses,
which constitute the main type of substrate adopted on plasmonic structures. In this work we performed the analysis of effects due implementation of Er3+ and Tm3+ ions into BK7 glass over a pattern of nanobowtie on absence of gap
between its tips, fabricated by focused ion beam (FIB) technique from gold (Au) films. The bowties were vertically
excited by an Argon laser (Ar) which wavelength ( ) is 488 nm. Furthermore, computational simulations based on finite
element method (FEM), were performed to verify the dependence of nanobowtie’s geometry over the electric field along its symmetry axis.
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