Light guidance in photonic band gap guiding dual-ring light cages implemented by direct laser writing

Bumjoon Jang, Julian Gargiulo, Ron Fatobene Ando, Alberto Lauri, Stefan A. Maier, Markus A. Schmidt

Research output: Contribution to journalArticleResearchpeer-review

20 Citations (Scopus)


Efficient waveguiding inside low refractive index media is of key importance for a great variety of applications that demand strong light–matter interaction on small geometric footprints. Here, we demonstrate efficient light guidance in single-defect dual-ring light cages over millimeter distances that are integrated on silicon chips via direct laser writing. The cages consist of two rings of high aspect-ratio polymer strands (length 5 mm, aspect ratio >1000) hexagonally arranged around a hollow core. Clear-core mode formation via the photonic band gap effect is observed, with the experiments showing pronounced transmission bands with fringe and polarization contrasts of >20 dB and >15 dB, respectively. Numerical simulations confirm our experiments and reveal the dual-ring arrangement to be the optimal geometry within the light cage concept. Particularly, the side-wise access to the core regions and the chip integration makes the light cage concept attractive for a great number of fields such as bioanalytics or quantum technology.

Original languageEnglish
Pages (from-to)4016-4019
Number of pages4
JournalOptics Letters
Issue number16
Publication statusPublished - 15 Aug 2019
Externally publishedYes

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