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. 2025 Nov;37(44):e10524.
doi: 10.1002/adma.202510524. Epub 2025 Aug 25.

Nonresonant Raman Control of Ferroelectric Polarization

Affiliations

Nonresonant Raman Control of Ferroelectric Polarization

Jiaojian Shi et al. Adv Mater. 2025 Nov.

Abstract

Important advances is recently made in the search for materials with complex multi-phase landscapes that host photoinduced metastable collective states with exotic functionalities. In almost all cases so far, the desired phases are accessed by exploiting light-matter interactions via the imaginary part of the dielectric function through above-bandgap or resonant mode excitation. Nonresonant Raman excitation of coherent modes is experimentally observed and proposed for dynamic material control, but the resulting atomic excursion is limited to perturbative levels. Here, this challenge is overcome by employing nonresonant ultrashort pulses with low photon energies well below the bandgap. Using mid-infrared pulses, ferroelectric reversal is induced in lithium niobate, and the large-amplitude mode displacements are characterized through femtosecond stimulated Raman scattering and second harmonic generation. This approach, validated by first-principle calculations, defines a novel method for synthesizing hidden phases with unique functional properties and manipulating complex energy landscapes at reduced energy consumption and ultrafast speeds.

Keywords: ferroelectricity; impulsive stimulated raman scattering; phase transition.

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