Generation of optical needles and bright spot arrays through reversing the radiation pattern of collinear antenna array. (7th June 2019)

• Record Type: Journal Article
• Authors: Yu, Yanzhong; Huang, Han; Lin, Shunda; Chen, Musheng; Zhan, Qiwen
• Is Part Of: Journal of optics. Volume 21:Number 7(2019)
• Publication Date: 2019-06-07
• Subjects: optical needle -- bright spot -- 4pi configuration -- collinear antenna array; Optics -- Periodicals; 535.05
• DOI: 10.1088/2040-8986/ab235c
• Languages: English
• ISSNs: 2040-8978

Abstract

Abstract: An optimization-free approach is proposed for generating optical needle and bright spot arrays with controllable distributions. This is achieved by inversely focusing the radiation pattern from a collinear antenna array whose elements are placed along an optical axis and whose currents in each element also flow along that direction, situated at the focus of a 4pi configuration. The shape and central location of the n th focusing field only depend on the length l n and coordinate z n of the n th element in collinear array, respectively. The number of focal fields is determined by the number of elements in the array.