Very compact focal spot in the near-field of the fractional axicon

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• 作者：Svetlana Nikolaevna Khonina^a ; ^b ; ^{khonina@smr.ru} ; Andrey Vladimirovich Ustinov^a ; ^b
• 关键词：Near-field diffraction ; Fractional axicon ; Rayleigh-Sommerfeld integral ; Modified method of stationary phase ; Evanescent waves
• 刊名：Optics Communications
• 出版年：2017
• 出版时间：15 May 2017
• 年：2017
• 卷：391
• 期：Complete
• 页码：24-29
• 全文大小：1322 K
• 卷排序：391

文摘

The diffraction of a plane wave by a fractional axicon is analyzed. Physically the correction terms correspond to evanescent waves. Focused light spot has sizes several times smaller than the diffraction limit.