Excitation of high density surface plasmon polariton vortex array
| Autor: | Chun Fu Kuo, Shu Chun Chu |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Physics
business.industry Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology Polarization (waves) Laser 01 natural sciences Surface plasmon polariton Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Vortex law.invention 010309 optics Wavelength Optics law Condensed Matter::Superconductivity Excited state 0103 physical sciences 0210 nano-technology business Optical vortex Excitation |
| Zdroj: | Journal of Optics. 20:065002 |
| ISSN: | 2040-8986 2040-8978 |
| Popis: | This study proposes a method to excite surface plasmon polariton (SPP) vortex array of high spatial density on metal/air interface. A doughnut vector beam was incident at four rectangularly arranged slits to excite SPP vortex array. The doughnut vector beam used in this study has the same field intensity distribution as the regular doughnut laser mode, TEM01* mode, but a different polarization distribution. The SPP vortex array is achieved through the matching of both polarization state and phase state of the incident doughnut vector beam with the four slits. The SPP field distribution excited in this study contains stable array-distributed time-varying optical vortices. Theoretical derivation, analytical calculation and numerical simulation were used to discuss the characteristics of the induced SPP vortex array. The period of the SPP vortex array induced by the proposed method had only half SPPs wavelength. In addition, the vortex number in an excited SPP vortex array can be increased by enlarging the structure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|