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arXiv · 2604.10111

Experimental Observation of Time-Domain Bound States in The Continuum

Zahra Manzoor·Oded Schiller·Yonatan Plotnik·Mordechai Segev·Dimitrios Peroulis
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Abstract

Bound states in the continuum (BICs) are spatially localized eigenmodes that remain perfectly confined even though their energies reside within a continuum of radiating modes. BICs were predicted in 1929, but their experimental realization awaited more than 8 decades. Following their experimental observation, BICs were explored in a variety of wave systems, and found to exhibit a plethora of fundamental features such nontrivial topology and extremely high Q-factor. Recently, with foundational advances in the new field of electromagnetic waves in time-varying media, BICs were predicted to exist in the time domain, with their wavenumber embedded in a continuum of unbound momentum modes. Here, we present the first experimental realization of the time-domain Bound States in the Continuum. We use a transmission-line network with a time-modulated wave-impedance and show that a sinusoidal wave launched into the network naturally evolves into a time-domain BIC with a well-defined peak and decaying-oscillating tails. We show that the time-domain BIC is anti-symmetric despite the symmetric nature of the modulation. These experiments pave the way for exploring new phenomena in the fields of BICs and time-varying wave-systems in nonconservative regimes where time-translation symmetry is broken.

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Zahra Manzoor, Oded Schiller, Yonatan Plotnik, Mordechai Segev, Dimitrios Peroulis. 2026-04-11. Experimental Observation of Time-Domain Bound States in The Continuum. https://arxiv.org/abs/2604.10111

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