Side-lobes-controlled photonic nanojet with a horizontal graded-index microcylinder

Optics Letters
Huaming XingYihui Wu

Abstract

A photonic nanojet generated by the transparent dielectric microparticle (microsphere or microcylinder) is a sub-wavelength focused beam. The properties of the photonic nanojet have been modified by changing the refractive index and structure of the micropaticles. In this Letter, a super-narrow photonic nanojet with a full width at half-maximum waist of approximately 116.6 nm (λ/4.3, with 500 nm excitation wavelength) is obtained by a horizontal graded-index microcylinder, which is divided by multilayers parallel to the direction of light propagation. The method for side lobes controlling by the waves' superposition from the modified graded refractive index and that of the center layer is proposed and discussed. Also, a structure with the composition of different height plates approaching the desired circular section is suggested for decreasing the difficulties in fabrication, and generates a similar photonic nanojet.

References

Oct 8, 2005·Optics Letters·Sylvain LeclerPatrick Meyrueis
Jul 26, 2008·Nature Nanotechnology·Euan McLeod, Craig B Arnold
Sep 6, 2008·Optics Express·Soon-Cheol KongVadim Backman
Sep 6, 2008·Optics Express·Alexis DevilezEvgueni Popov
Mar 5, 2009·Optics Express·Soon-Cheol KongVadim Backman
Mar 3, 2011·Nature Communications·Zengbo WangMinghui Hong
Aug 15, 2014·Optics Letters·Yuecheng ShenJung-Tsung Shen
Dec 3, 2016·Journal of Biomedical Optics·Paul Kumar UpputuriManojit Pramanik
Feb 15, 2018·Optics Letters·Liyang YueIgor V Minin

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