4.6 Article

Capturing Broadband Light in a Compact Bound State in the Continuum

期刊

ACS PHOTONICS
卷 8, 期 3, 页码 813-823

出版社

AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.0c01696

关键词

time-varying systems; optical scattering; epsilon-near-zero media; optical cavity; embedded eigenstates; bound states in the continuum

资金

  1. National Science Foundation (NSF) [1741694]
  2. Air Force Office of Scientific Research [FA9550-19-1-0043]
  3. Fulbright Foreign Student Program of the U.S. Department of State

向作者/读者索取更多资源

The study shows that subwavelength open resonators undergoing suitable temporal modulation can efficiently capture broadband incident waves into nonradiating structural eigenmodes, representing the first example of a BiC accessible to broadband light. These time-varying BiCs have the potential to overcome some bandwidth limitations of achromatic dispersion-engineered metalenses, highlighting their dynamic capabilities and expanding their reach for various applications.
Trapping and storing light for arbitrary time lengths in open cavities is a major goal of nanophotonics, with potential applications ranging from energy harvesting to optical information processing. Unfortunately, however, the resonance lifetime of conventional open resonators remains finite, even in the limit of vanishing material absorption, as a result of radiation loss. In this context, bound states in the continuum (BiCs) have provided a unique way to achieve unbounded resonance lifetimes despite the presence of compatible radiation channels. However, physical constraints such as reciprocity, linearity, time-invariance and delay-bandwidth limits prevent the possibility to externally excite such ideal bound states and make them interact with broadband sources. Here, we overcome some of these limitations and theoretically demonstrate that subwavelength open resonators undergoing a suitable temporal modulation can efficiently capture a broadband incident wave into a nonradiating eigenmode of the structure, leading to the first example of a BiC that is accessible to broadband light. To further highlight the potential of the proposed concepts, we also show that such time-varying BiCs can be employed to bypass some of the bandwidth limitations of achromatic dispersion-engineered metalenses. Our findings unveil the dynamic capabilities of bound states in the continuum and extend their reach and potential impact for different applications.

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