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Charting a course to efficient difference frequency generation in molecular-engineered liquid-core fiber.

Christian K Keyser, Micah E Raab, Patrick Hemmer

|May 9, 2023

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Area of Science:

Nonlinear Optics
Materials Science
Photonics

Background:

Traditional nonlinear optical processes like difference frequency generation (DFG) require bulk crystals, disrupting monolithic fiber architectures.
Accessing second-order nonlinear optical susceptibility (χ(2)) is crucial for applications like wavelength conversion and photon-pair generation.

Purpose of the Study:

To propose and investigate a novel solution for integrating χ(2) nonlinear optical processes within a monolithic fiber architecture.
To explore the use of quasi-phase matching (QPM) in molecular-engineered, hydrogen-free, polar-liquid core fiber (LCF).

Main Methods:

Utilizing numerical modeling to assess the feasibility of QPM in LCF.
Investigating hydrogen-free polar molecules for NIR-MIR transmission and alignment in an electrostatic field.
Exploring charge transfer (CT) molecules to enhance the effective second-order nonlinear susceptibility (χ(2)eff).

Main Results:

Demonstrated that LCF exhibits good NIR-MIR transmission and a suitable QPM DFG electrode period.
Showed that CT molecules can potentially achieve χ(2)eff comparable to silica fiber cores.
Numerical modeling indicated nearly 90% efficiency for signal amplification and generation via QPM DFG in the degenerate case.

Conclusions:

The proposed LCF architecture offers a promising route to monolithic integration of χ(2) nonlinear optical processes.
Molecular engineering of liquid cores, particularly with CT molecules, can significantly enhance nonlinear optical performance.
This approach has the potential to advance applications in wavelength conversion and quantum photonics.