Abstract

In this work, a numerical investigation of how temperature can tune the FWHM and working distance (WD) of a photonic nanojet (PNJ) is conducted. Vanadium oxide (VO2), a phase change material, is coated onto the top half-surface of a glass microsphere and illuminated with incident light at a wavelength of 800 nm. As VO2 changes from semiconducting to metallic phase, the refractive index of the VO2 layer changes at its transition temperature of 68°C. It is found that a coating of 75 nm on a 5.0 μm diameter microsphere with a refractive index of 1.50 is the most optimal, as it tunes the FWHM the greatest while remaining thin enough to have a high transmission. When temperature is raised from 20°C to 90°C, the FWHM varies from 0.43 to 0.37 μm, corresponding to a 14.0% change. The WD varies from 0.29 to 0.20 μm, corresponding to a 31.0% change. Tunable PNJs have potential applications in tunable nanolithography and imaging.

© 2016 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Modulation of photonic nanojets generated by microspheres decorated with concentric rings

M. X. Wu, B. J. Huang, R. Chen, Y. Yang, J. F. Wu, R. Ji, X. D. Chen, and M. H. Hong
Opt. Express 23(15) 20096-20103 (2015)

Ultralong photonic nanojet formed by dielectric microtoroid structure

Baifu Zhang, Jingjing Hao, Zhe Shen, Heng Wu, Kang Zhu, Ji Xu, and Jianping Ding
Appl. Opt. 57(28) 8331-8337 (2018)

Effect of substrate orientation on terahertz optical transmission through VO2 thin films and application to functional antireflection coatings

Yanhan Zhu, Yong Zhao, Mark Holtz, Zhaoyang Fan, and Ayrton A. Bernussi
J. Opt. Soc. Am. B 29(9) 2373-2378 (2012)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (5)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription