The plasmonic sensors based on graphene and application

The plasmon polaritions on surface, that are induced in the metal/dielectric interface, have been used in sensor applications for a long time. Thanks to the great improvement on the informatic technology, the studies on sensors have begun to be supported with the simulation studies. The phases of the design, simulation, production and usage have been pursued for the studies of the plasmonic sensors. Despite these applying the phases at every turn, designing plasmonic sensors, of which resonance frequency can be tuned in actively, provides important advantages. The plasmonic sensors that will be designed as a graphene,-of which qualifications can be changed, have been also used. This graphene has an electrical traction effect. It has been possible to receive the answer of the frequency of the plasmonic sensor in a large vacancy, that has been designed with FDTD simulation programme. The graphene, which is used as a fundemental material within this thesis, is a material, which has a plasmonic qualification between the infrared to THz frequency range. A sensor has been able to design in a visible area by changing its optical qualifications and applying electiric field. The match-up with a periodical structure has been used methodically during the design of the plasmonic sensor. The renosance wavelenght can be changed by changing the dimension, the form and the kind of the material of the structures. The design of the sensor, of which resonance frequency can be tuned in actively, has great advantages nowadays. After the designed sensors have been produced, their qualifications can not be changed. To operate the currently designed sensor in a different wavelenght gap, sensor is supposed to be designed from the beginning. The studies on sensors consist of the phases of the sensor design, bringing about the simulation phases, production and the usage. If the results of the experiment contrasts with the reckonings, or the variance of the parameter decided, it is supposed to be started over. To design a plasmonic sensor,-of which resonance frequency is controlled actively within this project, presents great advantages by combining with the current technology. On the other hand, the electron circumstance intensity of a graphene is able to be changed by applying voltage on it. In this way it has been used on the sensor, which will be designed, because of that the qualifications of a graphen are able to be changed. The main purpose of the actualized studies, is to design a plasmonic sensor, of which resonance frequency can be tuned in actively. A graphene has been used, because of that the plasmonic sensor-that will be designed- is supposed to have a large gap for scanning from the large frequency gap, namely; from the infrared area till THz frequency area. Because a graphene is a material that has plasmonic qualifications in THz area. Our aim is to proceed about the studies, without repeating these phases, because of that the resonance frequency of the plasmonic sensors can be tuned in actively. In this way, both the time will be saved, and the researches will be varied. In substance, the plasmonic sensor design based on graphene, of which resonance frequency can be tuned in actively, will be do within this thesis. The intended alteration on the designed plasmonic sensor, will be able to carry out without starting over, because of the resonance frequency. KEYWORDS: FDTD, graphene, Maxwell equations, plasmonic sensor, resonance frequency