Experimental Study of Fabry-Perot BICs in a Microwave Waveguide
arXiv:2505.17444 · doi:10.1063/5.0285583
Abstract
We study Fabry-Perot bound states in the continuum (FP-BIC) in the GHz frequency range, formed by two ceramic discs placed inside a metallic-walled rectangular waveguide, that act as perfect reflectors at the resonant frequency. The energy becomes perfectly trapped between the discs, forming a FP-BIC, when the distance between them matches the Fabry-Perot quantization condition. We present both theoretical and experimental analyses to investigate how the total and radiative quality factors (Q factors) depend on the inter-disk distance. We gain valuable insights into the Fano features observed in the transmission spectra using the quasi-normal mode technique and temporal coupled mode theory. Notably, we find that as the system approaches the BICs, the Fano asymmetry parameters diverge, resulting in a Lorentzian transmission profile. Experimentally, we measure a radiative Q factor on the order of , while the total Q factor, limited by material losses, remains around . These results offer new opportunities for the application of BICs in microwave technology, significantly advancing the potential for high-performance devices.
6 pages, 5 figures
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