Volume 125, Number 2, January 2019
|Number of page(s)||5|
|Section||Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics, and Fluid Dynamics|
|Published online||19 February 2019|
Engineering arrays of diffraction-limited hollow tubes and doughnut spots with prescribed distributions
1 College of Physics & Information Engineering, Quanzhou Normal University - Fujian 362000, China
2 School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology Shanghai 200093, China
3 Department of Electro-Optics and Photonics, University of Dayton - 300 College Park, Dayton, OH 45469, USA
Received: 4 November 2018
Accepted: 15 January 2019
Based on the principle of antenna pattern multiplication as the product of the element pattern and the array factor, a simple and flexible method to generate diffraction-limited optical hollow-tube and doughnut-spot arrays with predetermined properties is proposed. This approach can be realized in a 4Pi focusing system by reversing the field radiated from the collinear antenna array whose elements are isotropic magnetic current sources. Both hollow tubes and doughnut spots produced by this method are pure azimuthally polarized fields whose intensity distribution is nearly unchanged along the entire depth of focus. Numerical results show that the appearance and position of the focal field is determined by the element pattern and the array factor, respectively. These peculiar optical focal fields may find applications in multi-particle trapping and manipulation, materials processing, data storage, super-resolution optical microscopy and optical lithography.
PACS: 42.25.Ja – Polarization / 42.25.Fx – Diffraction and scattering / 42.25.Gy – Edge and boundary effects; reflection and refraction
© EPLA, 2019
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