Abstract
The ability to control light propagation in photonic integrated circuits is at the foundation of modern light-based communication. However, the inherent crosstalk in densely packed waveguides and the lack of robust control of the coupling are a major roadblock toward ultra-high density photonic integrated circuits. As a result, the diffraction limit is often considered as the lower bound for ultra-dense silicon photonics circuits. Here we experimentally demonstrate an active control of the coupling between two closely packed waveguides via the interaction with a decoupled waveguide. This control scheme is analogous to the adiabatic elimination, a well-known procedure in atomic physics. This approach offers an attractive solution for ultra-dense integrated nanophotonics for light-based communications and integrated quantum computing.
Highlights
The ability to control light propagation in photonic integrated circuits is at the foundation of modern light-based communication
We experimentally demonstrate a unique scheme based on adiabatic elimination (AE) concept that effectively manipulates the coupling between densely packed waveguides
Two-coupled modes are a cornerstone in many research fields—from the dynamics of spin-half systems in nuclear magnetic resonances through two-level systems in atomic and molecular physics to polarization optics and directional couplers[6,19,20]
Summary
The ability to control light propagation in photonic integrated circuits is at the foundation of modern light-based communication. We experimentally demonstrate an active control of the coupling between two closely packed waveguides via the interaction with a decoupled waveguide This control scheme is analogous to the adiabatic elimination, a well-known procedure in atomic physics. We demonstrate active coupling control between two closely packed waveguides by tuning the mode index of an in-between decoupled waveguide In this control scheme, the non-linearity influences the refractive index of a dark mode and leaves the signal unaffected by the induced losses. Our analysis includes the inherent higher order coupling, which is significant when packing is subwavelength, allowing control capabilities beyond what can be achieved in atomic physics This new class of AE-based nanophotonic devices lays down the foundation for ultra-dense integrated photonic circuits
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