Abstract: A biosensor that is configured to be implanted into a living being includes a light source configured to generate source light with a source light spectrum. The biosensor also includes plasmonic nano-antenna optically coupled to the light source to receive the source light and to emit light therefrom exhibiting a spectral signature of the plasmonic nano¬antenna. A bio-functionalized element joined to the plasmonic nano-antenna can receive a biomarker if available and effect a change in the spectral signature as a function of receipt or nonreceipt of the biomarker. A combination of the light source and nano-antenna can encode an optical communication signal into the emitted light and transmit the signal to a separate communication node. An optional detector can detect the emitted light and provide output indicative of receipt or nonreceipt of the biomarker, which can in turn be encoded into the communication signal for reporting to another node.