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The interband pi and pi+sigma plasmons in pristine graphene and the Diracplasmon in doped graphene are not applicable, since they are broad or weak, andweakly couple to an external longitudinal or electromagnetic probe. Therefore,the ab initio Density Function Theory is used to demonstrate that the chemicaldoping of the graphene by the alkali or alkaline earth atoms dramaticallychanges the poor graphene excitation spectrum in the ultra-violet frequencyrange (4 - 10 eV). Four prominent modes are detected. Two of them are theintra-layer plasmons with the square-root dispersion, characteristic for thetwo-dimensional modes. The remaining two are the inter-layer plasmons, verystrong in the long-wavelength limit but damped for larger wave-vectors. Theoptical absorption calculations show that the inter-layer plasmons are bothoptically active, which makes these materials suitable for small organicmolecule sensing. This is particularly intriguing because the optically activetwo-dimensional plasmons have not been detected in other materials.

UV active plasmons in alkali and alkaline earth intercalated graphene