Dipole-Dependent Waveguiding in an Anisotropic Metal-Organic Framework

Area of Science:

• Materials Science
• Optics
• Chemistry

Background:

• Exciton-photon coupling is crucial for technologies like lasers and photonic circuits.
• Controlling exciton dipole and photon field orientations is key but challenging in molecular crystals.

Purpose of the Study:

• To demonstrate directional exciton dipoles and photon fields using metal-ligand coordination in MOFs.
• To explore the potential of MOFs as a platform for exciton-photonics.

Main Methods:

• Utilized a pyrene-porphyrin bichromophoric metal-organic framework (MOF).
• Investigated the effect of perpendicular exciton dipole arrangements on emission polarization.
• Analyzed the anisotropic waveguide effect arising from aligned exciton and photon fields.

Main Results:

• Observed orthogonal emission polarizations from pyrene- and porphyrin-based exciton dipoles.
• Demonstrated distinct spatial distribution of emissions due to anisotropic waveguide effects in MOF crystals.
• Showcased MOFs' ability to host heterogeneous excitonic states and anisotropic photon fields.

Conclusions:

• MOFs offer a promising platform for precisely controlling exciton-photon interactions.
• Engineered exciton-photonics in MOFs can lead to novel optical and photonic devices.
• This work advances the field of exciton-photonics by enabling tailored control over light-matter interactions.