Fully programmable slow light based on a spinor representation of generalized coupled-resonator-induced transparency

TL;DR

This paper introduces a fully programmable slow-light system based on a generalized coupled-resonator-induced transparency (CRIT) using a spinor representation with dual-channel gauge fields, enabling dynamic spectral control for advanced photonic applications.

Contribution

It presents a novel spinor-based generalized CRIT framework with dual-channel gauge fields, allowing complete programmability and spectral engineering in slow-light photonic systems.

Findings

Demonstrated a programmable slow-light band in a 1D CRIT lattice.

Unified design parameters through a spinor representation and universal unitary operations.

Addressed optical interconnect needs like tunable delay lines and reconfigurable synchronization.

Abstract

Electromagnetically induced transparency (EIT), arising from quantum interference in coherently driven atomic systems, has inspired a variety of photonic analogues, such as coupled-resonator-induced transparency (CRIT) built on the quantum-state modelling using resonators. Although CRIT serves as a building block for slow light in photonic integrated circuits, recent advances in topological photonics motivate a further generalization of both EIT and CRIT using gauge-field degrees of freedom. Here, we propose generalized CRIT via a spinor representation with dual-channel gauge fields, enabling fully programmable CRIT featuring dynamical spectral engineering. We generalize the traditional EIT framework by introducing a spinor representation of bright- and dark-mode resonances, yielding a unified description of design parameters through universal unitary operations. Implementing a coupled-resonator building block that accesses the entire design space through dual-channel gauge fields, we demonstrate a programmable slow-light band in a one-dimensional CRIT lattice. These results address urgent needs in optical interconnects, such as tunable delay lines, reconfigurable synchronization, and linear frequency conversion.