August 2021
Spotlight Summary by Ilya Shadrivov
Splitting of a Tamm plasmon polariton at the interface between a metal and a resonant nanocomposite layer conjugated with a photonic crystal
There is a large variety of optical waveguides that, apart from structural difference, demonstrate different properties such as dispersion, attenuation and mode localization. In this work, scientists from Russia theoretically studied the Tamm surface waves in the system that contains a layer of composite material squeezed between a layer of metal and a Bragg grating. The authors of this work show that by changing the parameters of the composite medium, they can substantially change the dispersion of the modes guided by this waveguiding system. The modes in this system are guided between the surface of the metal and the Bragg grating that does not allow waves to escape when their frequencies belong to the bandgap. By changing the properties of the composite layer between the two effective mirrors, the authors show that the dispersion can be split into two branches, and in some cases, the waves can even become backward. Such ability to manipulate the dispersion is useful, for example, when there is a need to control the phase and group velocities of the waves. Transmission through such a system shows sharp maxima at the frequencies corresponding to the mode excitation, and the authors suggest that this can be used in spectral filters.
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Article Information
Splitting of a Tamm plasmon polariton at the interface between a metal and a resonant nanocomposite layer conjugated with a photonic crystal
Anastasia Yu. Avdeeva, Stepan Ya. Vetrov, and Ivan V. Timofeev
J. Opt. Soc. Am. B 38(6) 1792-1797 (2021) View: Abstract | HTML | PDF