A two-dimensional space-time terahertz memory in bulk SrTiO3

Abstract

Ferroelectric materials offer unprecedented ultrafast responses and are of great interest for the development of new polarizable media under the influence of an electromagnetic field. Recent research efforts have demonstrated the role of optical excitation and intense terahertz (THz) pulses in inducing a polar order and revealing a hidden phase transition in SrTiO3 (STO), respectively. Here we show that the surface of STO crystals at room temperature act as ultrafast sensors that enable sub-picosecond switching through the Kerr effect and multi-ps recording of polar THz intensity with spatial resolution below the diffraction limit through dipole alignment relaxation. The contrast sensitivity and spatial resolution achieved by in the STO sensor are significantly superior to those of present-day near-field THz sensors based on the linear Pockels effect, and more importantly, its ability to remain polarized for several picoseconds opens the door to a new strategy for building an ultrafast space-time THz memory.

References in corpus (12)

• Advances in Quantum Cryptography
• Single-cycle THz pulses with amplitudes exceeding 1 MV/cm generated by optical rectification in LiNbO3
• High-dimensional quantum cryptography with twisted light
• Terahertz-Field-Induced Ferroelectricity in Quantum Paraelectric SrTiO${}_3$
• Metastable ferroelectricity in optically strained $SrTi{O}_3$
• Physics of SrTiO${}_3$-based heterostructures and nanostructures: a review
• Terahertz-Driven Phonon Upconversion in SrTiO3
• Terahertz Kerr effect
• Superconductivity in dilute SrTiO${}_3$: a review
• Real-time terahertz near-field microscope
• Selective excitation of multipolar spoof plasmons using orbital angular momentum of light
• The sign of the polarizability anisotropy of polar molecules is obtained faithfully from terahertz Kerr effect