Bound States in the Continuum on a Silicon Chip with Dynamic Tuning

Abstract

Expanding bound states in the continuum (BIC) beyond photonic crystal systems may enable broader applications benefiting from the unique properties of BIC states. We use photonic integrated circuit to realize a Fabry-Pérot BIC on a silicon chip. The devices consist of cascaded ring resonators with tunable resonance frequencies and phase delays. As a result, the BIC state is dynamically tuned with electrical I/O. We analyze the mechanism of the formation of BIC states in this waveguide system and point out the fundamental differences between the BIC states and electromagnetically induced transparency states in integrated photonics. The high transmission protected by the BIC state enables versatile optical filters, which are capable of independent control over switching, peak position, and quality factor. We also demonstrate the scalability of this platform. This integrated silicon photonic platform brings opportunities for practical BIC applications.

Squeezing enhanced nonlinearity sensing in dissipatively coupled optical systems

“…These results correspond to the experimental parameters in Ref. [80]. Notice that the coordinate scales for S and S0 are different.…”

“…The orange dashed line and the blue solid line denote the sensitivity of the system to inherent nonlinearities at the CIS under the coherent drive and the squeezedlaser drive, respectively, where F = 0.01Γ. These results correspond to the experimental parameters in Ref [80]…”

“…Owing to recent progress in nanofabrication, our sensing protocol can be realized in experiments [80,81]. Here, we consider a silicon integrated photonic apparatus comprising two micro-ring resonators, both of them are coupled to a one-dimensional (1D) waveguide, as depicted in Fig.…”

“…To bridge the theoretical protocol and experiments, we use experimentally feasible parameters [80], Γ = κ ã, b = 1334 GHz, to demonstrate the feature of the CIS and the sensing enhancement at the CIS. Figures 7 show the eigenvalues and the corresponding sensitivities.…”

Realization of Bound States in the Continuum in Anti‐PT‐Symmetric Optical Systems: A Proposal and Analysis

“…When N = 2, the FP BIC can be realized if the intrinsic frequencies of resonators are equal and the phase shift is an integer multiple of π. [ 42 ] The phase shift naturally satisfies the FP resonance requirement since APT ‐symmetric systems require that θ = n π. When N > 2, we can also obtain the cascaded FP BIC if there is no resonance detuning (Δ = 0).…”