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- Title
Generation of sub-wavelength longitudinal magnetic probe and multiple spots using circularly polarized annular multi-Gaussian beam.
- Authors
Seethalakshmi, S.; Udhayakumar, M.; Priyadharsini, N.; Rajesh, K. B.; Jaroszewicz, Z.
- Abstract
Based on vector diffraction theory and inverse Faraday effect, we numerically studied the magnetization induced by a tightly focused circularly polarized annular multi-Gaussian beam. Numerical result shows that the magnetization spot as small as 0.4 λ which extends up to 8 λ can be induced for incident circularly polarized annular multi-Gaussian beam (CPAMGB). We also noted that the depth of focus of the generated magnetization spot can be very well improved up to 48 λ through suitable phase modulation to the incident CPAMGB by means of specially designed complex phase filter. Moreover, we also noted that one can generate a chain of magnetization spots of different numbers and sizes upon suitably changing the beam order of CPAMGB and radii of complex phase filter. We expect that such a study will be fruitful for experimental realization of all-optical magnetic recording, multiple magnetic particle trapping and transportation, confocal and magnetic resonance microscopy, as well as multilayer ultra-high-density magnetic storage.
- Publication
Journal of Optics (09728821), 2019, Vol 48, Issue 4, p586
- ISSN
0972-8821
- Publication type
Article
- DOI
10.1007/s12596-019-00571-9