RT - Journal Article T1 - Design of Graphene Based Photodetector with High Absorption and Responsivity JF - opsi YR - 2017 JO - opsi VO - 23 IS - 0 UR - http://opsi.ir/article-1-1416-en.html SP - 397 EP - 400 K1 - Graphene K1 - Photodetector K1 - Photoresponsivity K1 - Photocurrent K1 - Plasmonic. AB - In this paper, a novel structure of photodetector consisting of periodic layers of graphene and silica located on a metal film with groove rings of silica is proposed. The excited localized Plasmon resonance in groove rings makes a strong enhancement of light absorption in the graphene layer. The numerical results revealed that the graphene absorption increases from 2.3% to %47.5 and even in three-layer graphene, increases up to a maximum value of %80.7 in the C band. In addition, the absorption peak is dependent on the groove depth and ring radius as well as the number of graphene layers. Also, a photoresponsivity of 100A/W and photocurrent of 50mA at -1.5V bias and at wavelength of 1.55µm are achieved. LA eng UL http://opsi.ir/article-1-1416-en.html M3 ER -