Pancharatnam–Berry phase shaping for control of the transverse enhancement of focusing
| Autor: | Zhongsheng Man, Xiujie Dou, Shenggui Fu |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Electromagnetic field
Physics Diffraction business.industry Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics Optical axis Transverse plane Cardinal point Optics Geometric phase 0103 physical sciences Perpendicular 0210 nano-technology business Circular polarization |
| Zdroj: | Optics Letters, 44(2) |
| ISSN: | 1539-4794 0146-9592 |
| Popis: | We show that elongating a tightly focused field in the direction perpendicular to the optical axis is possible. We demonstrate our approach by specially shaping the Pancharatnam–Berry (PB) phase. Moreover, the analytical formulae required to calculate the strength vectors and energy flux of the three-dimensional electromagnetic fields near the focus of an aplanatic optical system are derived using the Richards and Wolf vectorial diffraction methods. Calculations reveal that the transverse enhancement is controllable and depend on the phase index in the PB phase, thereby giving rise to a focus with tunable length and subwavelength width in the focal plane. |
| Databáze: | OpenAIRE |
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