  The resonant modes associated with engineered photonic structures of
different spatial-dimension are essential to obtain bright on-demand single
photon sources for quantum technologies. Negatively-charged nitrogen-vacancy
(NV-) center in diamond is proposed as an excellent single photon source at
room temperature. The possible optical readout of spin states in diamond makes
it a good candidate for spin-photon interface. However, the poor light
collection, feeble zero-phonon line, low emission rate, and the presence of
broad phonon-induced emission limits the use of NV- center in quantum
technologies. Here, we present a feasible, easy to fabricate, asymmetric Tamm
structure coupled with single NV- center to enhance the emission rate of zero
phonon line (ZPL) with better light collection efficiency. The asymmetric Tamm
structure shows dual resonant mode with one of the modes coinciding with NV-
ZPL wavelength of 640 nm. The quality factor (Q-factor) of the mode is 140
which is far better than the Q-factor of conventional Tamm structure and hence,
better field intensity localization. We achieve four times Purcell enhancement
along with an enhanced light collection efficiency of five times at 640 nm. The
proposed structure is useful for generating bright single photons using NV-
center and an efficient spin-photon interface.
