▎ 摘　　要

NOVELTY - The device (100) has a graphene resonator (102) provided with a selected surface plasmon (SP) energy mode (108) by modification of an associated Fermi energy and coupled with a carbon nanotube (CNT) gain element (104) through exciton-plasmon interaction. The graphene resonator comprises a rectangular or square graphene nanoflake (GNF) in which side lengths of the GNF are between 25 nano-meters (nm) and 100 nm. The CNT gain element comprises a single-walled CNT (SWNT) characterized by chirality vector to be selected such that the SWNT includes semiconducting properties. USE - Spaser device i.e. carbon-based spaser device, for use in treatment of a medical condition i.e. cancer (claimed). ADVANTAGE - The device has an ability to vary designs to adapt or tune spasing parameters with low toxicity and biocompatibility, simultaneously improving spasing threshold and quality factor of the graphene resonator resulting in lower losses and improved spaser performance. The device has improved tuning parameters to significantly facilitate fabrication of the device by making suggested design to be flexible and with broad tunability, while offering mechanical strength and thermal and chemical stability due to unique properties of graphene and CNTs for use in biomedical applications. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the following: (1) a method for providing a spaser device (2) a method for treating a medical condition. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic perspective view of a spaser device. Spaser device (100) Graphene resonator (102) CNT gain element (104) Laser source (106) SP energy mode (108)