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  • Title: Ultralong photonic nanojet formed by a two-layer dielectric microsphere.
    Author: Shen Y, Wang LV, Shen JT.
    Journal: Opt Lett; 2014 Jul 15; 39(14):4120-3. PubMed ID: 25121666.
    Abstract:
    A photonic nanojet is a highly focused optical beam with a subwavelength waist on the shadow side of the sphere. Successful far-field applications require long nanojets that extend afar. Using the exact Mie theory, we show that ultralong nanojets can be generated using a simple two-layer microsphere structure, using conventional optical materials that are readily available. In particular, we show that for a glass-based two-layer microsphere, the nanojet has an extension of 22 wavelengths. We also show that long nanojets can be formed using semiconductors at infrared frequencies in free space.
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