Nanoring Tamm Cavity in the Telecommunications O Band

Quantum and classical telecommunications require efficient sources of light.Semiconductorsources, owing to the high refractive index of the medium, oftenexploit photonic cavities to enhance the external emission of photons into awell-defined optical mode. Optical Tamm States (OTS), in which light isconfined between a distributed Bragg reflector and a thin metal layer haveattracted interest as confined Tamm structures are readily manufactureablebroadband cavities. Their effficiency is limited however by the absorptioninherent in the metal layer. We propose a nanoring Tamm structure in which ananoscale patterned annular metasurface is exploited to reduce this absorptionand thereby enhance emission efficiency. To this end, we present designs for ananoring Tamm structure optimised for the telecommunications O band, anddemonstrate a near doubling of output efficiency (35disc confined Tamm structure (18different wavelengths are suggestive of annular coupling between the Tamm stateand surface plasmons. These designs are applicable to the design of singlephoton sources, nanoLEDs, and nanolasers for communications.