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The physical origin of subwavelength photonic nanojet inretrograde-reflection mode (retro-PNJ) is theoretically considered. Thisspecific type of photonic nanojet emerges upon sequential double focusing of aplane optical wave by a transparent dielectric microparticle located near aflat reflecting mirror. For the first time to the best of our knowledge, wereport a unique property of retro-PNJ for increasing its focal length andintensity using microparticles with the optical contrast exceeding limitingvalue (n > 2) that fundamentally distinguishes retro-PNJ from regular PNJbehavior. This may drastically increase the trapping potential of PNJ-basedoptical tweezers.

Overcoming optical contrast limit of mesoscale light focusing by means of retrograde-reflection photonic nanojet