  Tamm plasmon provides a new avenue in plasmonics of interface states in
planar multilayer structures due to its strong light matter interaction. This
article reviews the research and development in Tamm plasmon polariton excited
at the interface of a metal and a distributed Bragg reflector. Tamm plasmon
offers an easy planar solution compared to patterned surface plasmon devices
with huge field enhancement at the interface and does not require of any phase
matching method for its excitation. The ease of depositing multilayer thin film
stacks, direct optical excitation, and high-Q modes make Tamm plasmons an
attractive field of research with potential practical applications. The basic
properties of the Tamm plasmon modes including its dispersion, effect of
different plasmon active metals, coupling with other resonant modes and their
polarization splitting, and tunability of Tamm plasmon coupled hybrid modes
under externally applied stimuli have been discussed. The application of Tamm
plasmon modes in lasers, hot electron photodetectors, perfect absorbers,
thermal emitters, light emitting devices, and sensors have also been discussed
in detail. This review covers all the major advancements in this field over the
last fifteen years with special emphasis on the application part.
