Observation of bound states in the continuum embedded in symmetry bandgaps

Alexander Cerjan, Christina Jorg, Sachin Vaidya, Shyam Augustine, Wladimir A. Benalcazar, Chia Wei Hsu, Georg Von Freymann, Mikael C. Rechtsman

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


In the past decade, symmetry-protected bound states in the continuum (BICs) have proven to be an important design principle for creating and enhancing devices reliant upon states with high-quality (Q) factors, such as sensors, lasers, and those for harmonic generation. However, as we show, current implementations of symmetry-protected BICs in photonic crystal slabs can only be found at the center of the Brillouin zone and below the Bragg diffraction limit, which fundamentally restricts their use to single-frequency applications. By microprinting a three-dimensional (3D) photonic crystal structure using two-photon polymerization, we demonstrate that this limitation can be overcome by altering the radiative environment surrounding the slab to be a 3D photonic crystal. This allows for the protection of a line of BICs by embedding it in a symmetry bandgap of the crystal. This concept substantially expands the design freedom available for developing next-generation devices with high-Q states.

Original languageEnglish (US)
Article numbereabk1117
JournalScience Advances
Issue number52
StatePublished - Dec 2021

All Science Journal Classification (ASJC) codes

  • General


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