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Giant and Tunable Excitonic Optical Anisotropy in Single-Crystal Halide Perovskites
Georgy Ermolaev1,2, Anatoly P Pushkarev3, Alexey Zhizhchenko4,5
1Emerging Technologies Research Center, XPANCEO, Dubai 00000, United Arab Emirates.
Nano Letters
|March 15, 2023
Summary
Researchers chemically altered halide perovskites to continuously tune giant optical anisotropy, achieving values up to 0.6. This breakthrough enables tunable anisotropic photonics with applications in light manipulation.
Area of Science:
- Materials Science
- Photonics
- Solid State Physics
Background:
- Giant optical anisotropy is crucial for advanced light manipulation.
- Continuous tunability of optical anisotropy remains a significant challenge in photonics.
Purpose of the Study:
- To develop a method for continuously tuning optical anisotropy in halide perovskites.
- To explore the potential of halide perovskites for next-generation tunable anisotropic photonics.
Main Methods:
- Chemical alteration of halogen atoms in single-crystal halide perovskites.
- Fabrication of perovskite anisotropic nanowaveguides.
Main Results:
- Achieved continuous modification of optical anisotropy by 0.14.
- Demonstrated optical anisotropy up to 0.6 in the visible range, the highest for non-van der Waals materials.
- Observed in-plane and out-of-plane anisotropy dependent on perovskite crystal shape (rectangular and square).
Conclusions:
- Chemical alteration of halide perovskites offers a viable route to tunable optical anisotropy.
- Halide perovskites exhibit significant optical anisotropy, suitable for advanced photonic applications.
- Perovskite anisotropic nanowaveguides demonstrate the impact of anisotropy on guiding modes, paving the way for new photonic devices.
