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We present the first-principles study of effects of the charge dopants suchas Cesium and Iodine encapsulated on the electronic structure of carbonnanotubes. An encapsulated cesium atom donates an electron to the nanotube andproduces donor-like states below the conduction bands. In contrast, an iodinetrimer (I$_{3}$) accepts an electron from the nanotube and produces anacceptor-like state above the valance band maximum. We find that a Cs atominside a metallic armchair carbon nanotube gives rise to spatial oscillationsof the density of states near the Fermi level.

Modification of the electronic structure in a carbon nanotube with the charge dopant encapsulation