Optics and Photonics Society of Iran

Abstract: In this paper, the design of graphene-based terahertz band detector has been provided. Due to the lack of band gap in graphene, there is no chance for frequency separation and the desired band, hence we introduce the graphene Armchair nanoribbon the most appropriate structure for frequency selection in the terahertz region. Nanoribbon width variations has been used to improve the detector characteristics. Effects of changes of shape and distances between edge carbon atoms on the detection band has been investigated. By using of main relations and obtained curves, we determined the desired nanoribbon width and we found that, terahertz band's is detectable by lowest nanoribbon width in 3p+2 armchair family and by changing the width, we can detected desired frequency. It was also found that lower marginal variations, however, will be leaded to more detection bandwidth. Employing this nanoribbon with determined width in the structure of conventional graphene detectors the desired frequency band will be detected, appropriately.