Quasi bound states in the continuum with few unit cells of photonic crystal slab

Publication: Research - peer-reviewJournal article – Annual report year: 2017


View graph of relations

Bound states in the continuum (BICs) in photonic crystal slabs represent the resonances with an infinite quality (Q)-factor, occurring above the light line for an infinitely periodic structure. We show that a set of BICs can turn into quasi-BICs with a very high Q-factor even for two or three unit cell structures. They are explained by a viewpoint of BICs originating from the tight-binding of individual resonances of each unit cell as in semiconductors. Combined with a reciprocal-space matching technique, the microcavities based on quasi-BICs can achieve a Q-factor as high as defect-based PhC microcavities. These results may enable the experimental studies of BICs in a compact platform as well as realizing high-Q mirrorless microcavities.
Original languageEnglish
Article number5
JournalApplied Physics Letters
Issue number3
Pages (from-to)031114
StatePublished - 2017
CitationsWeb of Science® Times Cited: 4


  • Electronic Components and Tubes, Atomic and Molecular Physics, Crystal Lattice, Electric Variables Measurements, Microcavities, Periodic structures, Photonic crystals, Q factor measurement, Bound state, High Q factor, Light lines, Photonic crystal slab, Quality factors, Quasi-bound state, Reciprocal space, Tight binding, Crystal structure
Download as:
Download as PDF
Select render style:
Download as HTML
Select render style:
Download as Word
Select render style:

ID: 134332794