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Evanescent-wave coupling phase-matching for ultrawidely tunable frequency conversion in silicon-waveguide chips.

Yingwen Liu, Chao Wu, XiaoGang Qiang

|November 6, 2019

Summary

We introduce a new phase-matching method using evanescent-wave coupling in silicon waveguides. This technique enables ultrawidely tunable frequency conversion and entangled photon generation for photonic chips.

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Area of Science:

Nonlinear optics
Quantum optics
Integrated photonics

Background:

Photonic chips with third-order nonlinearity (χ(3)) offer potential for nonlinear optical processes.
Achieving widely tunable entangled photon pairs in such systems is challenging due to phase-matching limitations.

Purpose of the Study:

To propose and analyze an evanescent-wave coupling phase-matching method for ultrawidely tunable frequency conversion.
To enhance nonlinear optical properties and enable new functionalities in photonic chips.
To demonstrate the generation of widely tunable entangled photon pairs in coupled waveguides.

Main Methods:

Utilizing evanescent-wave coupling between two silicon waveguides to compensate for phase-mismatch.
Designing a two-coupled-waveguide system for spontaneous four-wave mixing.

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Characterizing the tuning range and bandwidth of the phase-matching method.

Main Results:

Achieved ultrawidely tunable entangled photon pairs with a tuning range of 1170-2300 nm (TE-mode) and 1400-1730 nm (TM-mode).
Demonstrated efficient coupling coefficient for phase-mismatch compensation.
Characterized the bandwidth of the evanescent-wave coupling phase-matching.

Conclusions:

The evanescent-wave coupling phase-matching method significantly boosts nonlinear optical properties in photonic chips.
This strategy enables the generation of entangled photon pairs, previously inaccessible in χ(3) waveguides.
The method is broadly applicable to χ(2) and χ(3) waveguide chips, positioning them as versatile broadband frequency converters for nonlinear and quantum optics applications.