期刊
ADVANCED FUNCTIONAL MATERIALS
卷 32, 期 34, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202203680
关键词
bound states in the continuum; multifunctional metamaterials; terahertz; ultrafast dynamics
类别
资金
- National Natural Science Foundation of China [62075240]
- National Key Research and Development Program of China [2020YFB2205800]
The paper proposes a new scheme to construct a coupled photon cavity for spatiotemporal lineshape tailoring. By utilizing the phase transition of VO2 inclusions and introducing a transient photoconductivity layer, the coupling of BIC and EIT states is achieved, providing a general method for tuning photonic devices.
The bound state in the continuum (BIC) is a unique nonradiating eigenstate that possesses rich physics and has attracted intensive attention in the field of optics and photonics. Actively tailoring BICs in a designable fashion is highly desired for diversified photonic devices. However, to date, most BIC-assisted works have been limited to showing passive control in a fixed structure configuration without tuning the spectral responses. Here, a new scheme to construct a coupled photon cavity for spatiotemporal lineshape tailoring, in which a nonradiating BIC is embedded in the electromagnetic induced transparency (EIT) window, is proposed. This approach uses the phase transition of VO2 inclusions to induce spatial symmetry breaking, leading to the formation of a quasi-BIC coupled EIT state. As an extra dimension for dynamic tuning, a layer with a transient photoconductivity much shorter than the photon lifetime is introduced to ultrafast switch the leaky modes for both EIT- and quasi-BIC-coupled EIT cavities. As the symmetry-protected BIC and coupling effect are quite common in optical metasurfaces, this proposal provides a general paradigm to active steer spatiotemporal spectrum across multiple dimensions, which is thus believed to promote active metadevices for potential applications in modulators, sensors, filters, and dynamic imaging.
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