Tunable photonic nanojet formed by a two-layer dielectric microcylinder

Yajie Chen; Xintao Zeng; Ning Su; Pinghui Wu

doi:10.1117/12.2618005

15 February 2022 Tunable photonic nanojet formed by a two-layer dielectric microcylinder

Yajie Chen, Xintao Zeng, Ning Su, Pinghui Wu

Proceedings Volume 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021); 121667R (2022) https://doi.org/10.1117/12.2618005
Event: Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 2021, Hong Kong, Hong Kong

Abstract

A photonic nanojets (PNJs) is a highly confined light beam that focuses from the shadow side of microparticles. In this simulation work, we report the realization of a tunable PNJ, which is formed by an engineered two-layer dielectric microcylinder. The key parameters, maximum intensity, length of PNJ and full-width at half maximum (FWHM), of photonic nanojets (PNJs) are studied. Finite difference time-domain (FDTD) analysis shows that under 400nm illumination, a PNJ with a high quality factor of 145.78 is achieved. We find that the photonic nanojets can be tuned by changing the distance between two layers of dielectric microcylinder. Because of its simple structure and flexibility, it has potential applications in optical imaging, nanolithography, and nanoparticle manipulation.

Citation Download Citation

Yajie Chen, Xintao Zeng, Ning Su, and Pinghui Wu "Tunable photonic nanojet formed by a two-layer dielectric microcylinder", Proc. SPIE 12166, Seventh Asia Pacific Conference on Optics Manufacture and 2021 International Forum of Young Scientists on Advanced Optical Manufacturing (APCOM and YSAOM 2021), 121667R (15 February 2022); https://doi.org/10.1117/12.2618005

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