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Focal shift in radially polarized beam with high NA lens axicon by using radial cosine phase wavefront |
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| Authors: | K. Prabakaran K. B. Rajesh T. V. S. Pillai R. Chandrasekaran Z. Jaroszewicz |
| Affiliation: | 1. University Department, Department of Physics, Regional Center, Anna University, Tirunelveli Region, Tirunelveli, Tamilnadu, India 2. Department of Physics, Chikkana Government Arts College, Tiruppur, Tamilnadu, India 3. Department of Physics, Government Arts College, Dharmapuri, Tamilnadu, India 4. Department of Physical Optics, Institute of Applied Optics, Warsaw, Poland 5. National Institute of Telecommunications, Warsaw, Poland |
| Abstract: | Focal shift in radially polarized beam with radial cosine phase wavefront are investigated theoretically by vector diffraction theory. The wavefront phase distribution is cosine function of radial coordinate. Simulation results show that when the radially polarized beam with radial cosine wavefront phase is focused, the focal pattern differs considerably with frequency parameter in the cosine function term. On increasing C, focus can shift along optical axis and focal pattern changes remarkably. Focus may move in different direction under different condition. Focal shift distance fluctuates on increasing C, and fluctuation amplitude also increases simultaneously. In addition, focal shift direction can also be adjusted by changing frequency parameter in cosine function. |
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