Photonic devices rely heavily on resonant cavities of high quality factors (Q), as they enable highly effective light confinement and ultra-long radiation lifetimes. Traditional techniques to accomplish this include microring resonators, photonic crystals, and Bragg microcavities.
However, BICs offer a novel solution to achieve extraordinarily high-Q resonant cavities. BICs exist within the radiation continuum, an elevated plane of existence above the light line. Intriguingly, despite being in this continuum, BICs' intrinsic optical fields remain confined within the structure, without leaking into free space, thus exhibiting an infinite radiative Q.
A significant number of scholarly articles have reported various applications of BICs across different fields. Multiple review articles have synthesized the progress made in BICs, offering comprehensive overviews.
Moreover, most overlook the perspectives of BICs in terahertz photonics. This omission was recently rectified by Professor Longqing Cong and his team at the Southern University of Science and Technology, who published a seminal review article in the journal Ultrafast Science.
The team's article, "Recent advances and perspective of photonic bound states in the continuum," addresses the understudied aspects of BICs. Beginning with the fundamental interpretations of BICs from the viewpoint of far-field interference of multipoles and near-field properties of topological charges, the team then shines a light on the recent efforts to manipulate BICs' far-field radiation properties through engineering topological charges.
The review article proceeds to categorize the latest advancements in applications such as chiral light and vortex beam generation, harmonics generation, sensors, and lasing. A major highlight is the thorough overview of the latest progress of BICs in the terahertz regime, wherein the team outlines potential applications in terahertz generation, detection, modulation, sensing, and isolation.
The ongoing advancements in BICs theory and application have far-reaching consequences for engineering resonances in photonic devices. As photonics proliferates across industrial applications, the research in BIC-enabled photonics is expected to remain a vibrant field. This work promises to drive further growth, both in classical optical regime and quantum photonics, thus advancing this rapidly evolving field.
Research Report:Recent Advances and Perspective of Photonic Bound States in the Continuum
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