Since 19th century, nanomaterial has been considered a promising material that can create a big jump in technology due to its special properties. The reason for the difference is based on the size effect of the material. With nanoscale size, the number of surface atoms increases significantly and takes a pivotal role in forming the material properties. Hence, the surface plasmon resonance effect becomes sig- nificantly strong in the nanomaterial. The plasmon effect was observed in the early 20th century by Prof Robert W. Wood and under research the following time. Up to now, Surface Plasmon Resonance (SPR) has been applied in many fields such as bio-detection, solar cells, and surface-enhanced Raman scattering. However, in the late 20th century Optical Vortices (OVs) was discovered as a new type of light with a topological charge and singularity in the optical axis. This light creates a new plasmon effect known as the Multipole Plasmon Resonance (MPR). In this thesis, I investigate the formation of the multipole plasmon resonance effect on metal nanostructures with different shapes and sizes. I use the DDSCAT program to simulate the interaction of a Laguerre-Gaussian beam (one mode of optical vor- tex) with the sample. Then, by analyzing the absorption and scattering spectrum we come up with the dependence of the MPR wavelength on the shape and size of the sample. By looking at the near-field electric distribution of the sample we can conclude the connection between the MPR state with the topological charge. Overall, my thesis provides a basic phenomenon about the MPR effect which is created by a Laguerre-Gaussian beam. This result can be used as reference information for future research in optical manipulation, optical communication, and optical properties of material.
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Since 19th century, nanomaterial has been considered a promising material that can create a big jump in technology due to its special properties. The reason for the difference is based on the size effect of the material. With nanoscale size, the number of surface atoms increases significantly and takes a pivotal role in forming the material properties. Hence, the surface plasmon resonance effect becomes sig- nificantly strong in the nanomaterial. The plasmon effect was observed in the early 20th century by Prof Robert W. Wood and under research the following time. Up to now, Surface Plasmon Resonance (SPR) has been applied in many fields such as bio-detection, solar cells, and surface-enhanced Raman scattering. However, in the late 20th century Optical Vortices (OVs) was discovered as a new type of light with a topological charge and singularity in the optical axis. This light creates a new plasmon effect known as the Multipole Plasmon Resonance (MPR). In this thesis, I investigate the formation of the multipole plasmon resonance effect on metal nanostructures with different shapes and sizes. I use the DDSCAT program to simulate the interaction of a Laguerre-Gaussian beam (one mode of optical vor- tex) with the sample. Then, by analyzing the absorption and scattering spectrum we come up with the dependence of the MPR wavelength on the shape and size of the sample. By looking at the near-field electric distribution of the sample we can conclude the connection between the MPR state with the topological charge. Overall, my thesis provides a basic phenomenon about the MPR effect which is created by a Laguerre-Gaussian beam. This result can be used as reference information for future research in optical manipulation, optical communication, and optical properties of material.
