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Overcoming refractive index limit of mesoscale light focusing by means of specular-reflection photonic nanojet

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Abstract

The physical origin of subwavelength photonic nanojet in specular-reflection mode ($s$-PNJ) is theoretically considered. This specific type of photonic nanojet (PNJ) emerges upon double focusing of a plane optical wave by a transparent dielectric microparticle located near a flat mirror. For the first time, to the best of our knowledge, we report a unique property of $s$-PNJ for increasing its focal length and intensity using circular-shaped microparticles with a refractive index ratio exceeding the known limiting value that fundamentally distinguishes $s$-PNJ from regular PNJ behavior. This may drastically increase the trapping potential of PNJ-based optical tweezers.

© 2020 Optical Society of America

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