Nonlinear Optical Properties of Halide Perovskite Nanostructures

Halide perovskite nanostructures have emerged as versatile platforms for exploring nonlinear optical phenomena owing to their strong light–matter interactions, tunable bandgaps and facile chemical processing. These materials span zero-dimensional colloidal quantum dots, two-dimensional layered phases and three-dimensional microcrystals, each offering distinct quantum-confinement effects that amplify multiphoton absorption, harmonic generation and intensity-dependent refractive indices. Under femtosecond and nanosecond excitation, perovskite nanostructures display pronounced two- and three-photon absorption, enabling deep-tissue bioimaging and high-contrast optical limiting. Quantum-defect engineering and core–shell architectures have produced record-high five-photon action cross-sections, while dimensional reduction in Ruddlesden–Popper phases enhances third-order nonlinearity without compromising material stability. Spin–orbit coupling and exciton resonances further modulate sub-bandgap absorption spectra, offering routes to low-threshold lasing and efficient upconversion. Collectively, these advances underline the global significance of perovskite nanophotonics for integrated photonic circuits, ultrafast signal processing and next-generation biomedical diagnostics.

Research from Nature Portfolio

Early demonstrations of five-photon upconversion in multidimensional core–shell perovskite colloids revealed action cross-sections nine orders of magnitude larger than those of organic dyes, establishing halide perovskites as frontiers for high-order nonlinear absorption. In parallel, investigations of two-dimensional lead iodide perovskites showed that quantum confinement can quadruple third-harmonic generation efficiency compared with bulk analogues, despite an increased bandgap, thus reconciling the often unfavourable inverse relation between nonlinearity and photon energy. More recent work has uncovered that strong spin–orbit coupling in methylammonium lead iodide leads to anomalous two-photon absorption spectra, with a second upward trend arising from transitions to heavy and light electron bands; this insight refines scaling laws and guides the design of sub-bandgap photonic devices.

Nonlinear Optical Properties of Halide Perovskite Nanostructures publication trend

The graph below shows the total number of articles in nonlinear optical properties of halide perovskite nanostructures across all publications each year (not limited to Nature Index journals).

Technical terms

Multiphoton absorption: simultaneous absorption of two or more photons to reach an excited electronic state.

Two-photon absorption (2PA): a nonlinear process in which two photons of identical or differing energies are absorbed concurrently.

Three-photon absorption (3PA): a higher-order nonlinear process involving the concurrent absorption of three photons.

Third-order nonlinear susceptibility (χ(3)): a material parameter quantifying intensity-dependent refractive index and nonlinear absorption effects.

Z-scan technique: an experimental method for characterising nonlinear absorption and refraction by translating a sample through the focus of a laser beam.

Exciton: a bound state of an electron and a hole whose resonant transitions often enhance nonlinear responses.

Bandgap: the energy difference between the valence and conduction bands, determining absorption thresholds and harmonic generation.

References

1. Giant five-photon absorption from multidimensional core-shell halide perovskite colloidal nanocrystals. Nature Communications (2017).
2. Selective enhancement of optical nonlinearity in two-dimensional organic-inorganic lead iodide perovskites. Nature Communications (2017).
3. The importance of relativistic effects on two-photon absorption spectra in metal halide perovskites. Nature Communications (2019).
4. Quantum‐Defect‐Minimized, Three‐Photon‐Pumped Ultralow‐Threshold Perovskite Excitonic Lasing. Advanced Functional Materials (2024).
5. Two-photon absorption in halide perovskites and their applications. Materials Horizons (2022).
6. Outstanding nonlinear optical properties of methylammonium- and Cs-PbX3 (X = Br, I, and Br–I) perovskites: Polycrystalline thin films and nanoparticles. APL Materials (2019).