Broadband light-extraction enhanced by arrays of whispering gallery resonators

Xiaolong Zhu, Yiyu Ou, Valdas Jokubavicius, Mikael Syvajarvi, Ole Hansen, Haiyan Ou, N. Asger Mortensen, Sanshui Xiao

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We demonstrate a light-extraction approach using a whispering gallery resonators array. The wavelength-scale resonant dielectric nanospheres support whispering gallery modes, which can be coupled with the confined waveguide modes inside the bulk material, thus dramatically improving light extraction. Broadband light-extraction enhancement across the entire visible spectral range is achieved by exciting three low-order and low-quality-factor resonances. As an example, the broadband extraction enhancement of about 50% is obtained for the emission of fluorescent SiC at all the tested angles. The experimental results are supported by numerical simulations. Our light-extraction strategy could enable the manufacturing of high-throughput, nondestructive, and affordable optical coating in a variety of optical devices.
Original languageEnglish
JournalApplied Physics Letters
Issue number24
Pages (from-to)241108
Publication statusPublished - 2012

Bibliographical note

Copyright 2012 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Applied Physics Letters / Volume 101 / Issue 24 and may be found at


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