Generation of sub-wavelength longitudinal magnetic probe and multiple spots using circularly polarized annular multi-Gaussian beam
| Autor: | M. Udhayakumar, K. B. Rajesh, Zbigniew Jaroszewicz, S. Seethalakshmi, N. Priyadharsini |
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| Rok vydání: | 2019 |
| Předmět: |
Diffraction
Inverse Faraday effect Physics business.industry Magnetic storage 02 engineering and technology Magnetic particle inspection Atomic and Molecular Physics and Optics law.invention Magnetization 020210 optoelectronics & photonics Optics law 0202 electrical engineering electronic engineering information engineering business Phase modulation Beam (structure) Gaussian beam |
| Zdroj: | Journal of Optics. 48:586-593 |
| ISSN: | 0974-6900 0972-8821 |
| DOI: | 10.1007/s12596-019-00571-9 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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