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Published July 15, 2014 | Published
Journal Article Open

Ultralong photonic nanojet formed by a two-layer dielectric microsphere


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.

Additional Information

© 2014 Optical Society of America. Received May 15, 2014; accepted June 4, 2014; posted June 9, 2014 (Doc. ID 212170); published July 7, 2014.

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Published - ol-39-14-4120.pdf


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