研究目的
Investigating the anisotropic and isotropic photon transport behaviors in two self-assembled cocrystal polymorph microplates to develop ultracompact on-chip circuits.
研究成果
The study successfully demonstrated the anisotropic and isotropic photon transport behaviors in two cocrystal polymorph microplates. The monoclinic microplate exhibited anisotropic photon-dipole interactions due to its nearly horizontal molecular transition dipole orientation, while the triclinic microplate showed isotropic photon-dipole interactions due to its vertical transition dipole orientation. Based on the anisotropic transport mechanism, a directional signal outcoupler (DSO) was designed for high-fidelity signal transmission, which could enlighten the development of 2D anisotropic optical devices.
研究不足
The study is limited to the specific cocrystal polymorphs (monoclinic and triclinic) fabricated from DMAQ and FDIB. The anisotropic and isotropic photon transport behaviors may vary with different materials and fabrication methods.
1：Experimental Design and Method Selection:
The study involved the fabrication of two cocrystal polymorph microplates (monoclinic and triclinic) from the same donor and acceptor molecules using a solution-concentration-controlled co-assembly strategy. The molecular packing structures and optoelectronic properties were tailored by introducing appropriate coformers.
2：Sample Selection and Data Sources:
The samples were prepared from a mixed solution of DMAQ and FDIB (2:1) in acetonitrile, drop-casted onto a glass substrate at room temperature. The concentration of the mixed solution was critical for controlled synthesis of specific crystal forms.
3：List of Experimental Equipment and Materials:
The study utilized a homemade micro-PL system for waveguide property investigations, TEM and SEM for morphology characterization, and SAED and XRD for molecular orientation and arrangement characterization.
4：Experimental Procedures and Operational Workflow:
The cocrystal polymorphs were fabricated via a solution-concentration-controlled co-assembly strategy. The waveguide properties were investigated with a homemade micro-PL system to reveal the structure–property relationship.
5：Data Analysis Methods:
The waveguide losses were analyzed by recording their respective propagation-distance-dependent PL intensity ratio between the excitation spot and waveguide edge. The loss curves were fitted by a single-exponential function.
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