Paper
4 March 2019 Are photonic nanojets achromatic?
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Abstract
In this work we study the evolution of the photonic nanojet (PNJ) phenomenon as the ratio of the sphere’s diameter over the illumination wavelength changes, for microspheres with diameters from 2μm to 100μm. We measure the focal point position by using 3D intensity scanning and identifying the maximum-intensity spot. We also measure the spot size at the focal plane using both intensity and phase data. Finally we use this information to compare the PNJ’s behavior to that of a ball lens and evaluate the importance of chromatic effect in the PNJ phenomenon.
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Michail Symeonidis, Myun-Sik Kim, and Toralf Scharf "Are photonic nanojets achromatic?", Proc. SPIE 10930, Advanced Fabrication Technologies for Micro/Nano Optics and Photonics XII, 109301C (4 March 2019); https://doi.org/10.1117/12.2509654
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KEYWORDS
Optical spheres

Phase measurement

Photonic nanostructures

Image resolution

Objectives

Wave propagation

Colorimetry

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