Controlling the mode profile of photonic crystal nanobeam cavities with mix-and-match unit cells

Sami I. Halimi; Zhongyuan Fu; Francis O. Afzal; Joshua A. Allen; Shuren Hu; Shuren Hu; Sharon M. Weiss; Sharon M. Weiss; Sharon M. Weiss

doi:10.1364/JOSAB.398574

Journal of the Optical Society of America B
Vol. 37,
Issue 11,
pp. 3401-3406
(2020)
•https://doi.org/10.1364/JOSAB.398574

Controlling the mode profile of photonic crystal nanobeam cavities with mix-and-match unit cells

Sami I. Halimi, Zhongyuan Fu, Francis O. Afzal, Joshua A. Allen, Shuren Hu, and Sharon M. Weiss

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Sami I. Halimi, Zhongyuan Fu, Francis O. Afzal, Joshua A. Allen, Shuren Hu, and Sharon M. Weiss, "Controlling the mode profile of photonic crystal nanobeam cavities with mix-and-match unit cells," J. Opt. Soc. Am. B 37, 3401-3406 (2020)

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- Photonics
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About this Article
History
- Original Manuscript: June 5, 2020
- Revised Manuscript: September 16, 2020
- Manuscript Accepted: September 16, 2020
- Published: October 20, 2020

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Abstract

We report simulations and experimental measurement of a photonic crystal (PhC) designed with different unit cell geometries in a single device. This “mix-and-match” approach enables enhanced mode manipulation by incorporating non-traditional unit cell shapes into a one-dimensional PhC nanobeam cavity. Inclusion of a bowtie-shaped unit cell in the center of a mix-and-match PhC nanobeam cavity comprised elsewhere of either circular or antislot unit cells leads to a 2 order of magnitude reduction in the mode volume of the cavity while maintaining a similar quality factor.

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Device	$Q$	$V_{m} (λ / n_{a i r})^{3}$
Air hole–air hole	$7.9 \times 10^{4}$	$1.5 \times 10^{- 2}$
Air hole–bowtie	$1.2 \times 10^{4}$	$1.6 \times 10^{- 4}$
Antislot–antislot	$9.4 \times 10^{4}$	$2.8 \times 10^{- 2}$
Antislot–bowtie	$2.7 \times 10^{4}$	$2.2 \times 10^{- 4}$
Bowtie–bowtie	$1.6 \times 10^{5}$	$1.9 \times 10^{- 4}$

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Journal of the Optical Society of America B