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Double Tips for In-Plane Polarized Near-Field Microscopy and Spectroscopy.
Nano Lett
October 2024
Freie Universität Berlin, Fachbereich Physik, Berlin, Berlin 14195, Germany.
Near-field optical microscopy and spectroscopy provide high-resolution imaging below the diffraction limit, crucial in physics, chemistry, and biology for studying molecules, nanoparticles, and viruses. These techniques use a sharp metallic tip of an atomic force microscope (AFM) to enhance incoming and scattered light by excited near-fields at the tip apex, leading to high sensitivity and a spatial resolution of a few nanometers. However, this restricts the near-field orientation to out-of-plane polarization, limiting optical polarization choices.
View Article and Find Full Text PDFOptical Control of In-Plane Domain Configuration and Domain Wall Motion in Ferroelectric and Ferroelastic Materials.
ACS Appl Mater Interfaces
July 2024
UGC-DAE Consortium for Scientific Research, Indore 452001, India.
Article Synopsis
- Ferroelectric domain walls are important for nanoelectronic devices due to their sensitivity to external stimuli, particularly optical signals.
- Researchers demonstrated that in-plane polarized subdomains in ferroelectric BaTiO can be controlled optically, allowing for reversible movement of domain walls.
- The study also suggests that flexoelectricity, rather than long-range ferroelectric polarization, plays a crucial role in optical control, making ferroelastic materials viable for future nanoelectronics.
Visible Out-of-plane Polarized Luminescence and Electronic Resonance in Black Phosphorus.
Nano Lett
April 2022
Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada.
Black phosphorus (BP) is unique among layered materials because of its homonuclear lattice and strong structural anisotropy. While recent investigations on few-layer BP have extensively explored the in-plane (, ) anisotropy, much less attention has been given to the out-of-plane direction (). Here, the optical response from bulk BP is probed using polarization-resolved photoluminescence (PL), photoluminescence excitation (PLE), and resonant Raman scattering along the zigzag, out-of-plane, and armchair directions.
View Article and Find Full Text PDFElectrostatically Driven Polarization Flop and Strain-Induced Curvature in Free-Standing Ferroelectric Superlattices.
Adv Mater
April 2022
Department of Physics and Astronomy, University College London, Gower Street, London, WC1E 6BT, UK.
The combination of strain and electrostatic engineering in epitaxial heterostructures of ferroelectric oxides offers many possibilities for inducing new phases, complex polar topologies, and enhanced electrical properties. However, the dominant effect of substrate clamping can also limit the electromechanical response and often leaves electrostatics to play a secondary role. Releasing the mechanical constraint imposed by the substrate can not only dramatically alter the balance between elastic and electrostatic forces, enabling them to compete on par with each other, but also activates new mechanical degrees of freedom, such as the macroscopic curvature of the heterostructure.
View Article and Find Full Text PDFProbing sub-diffraction optical confinement via the polarized Raman spectroscopy of a single-walled carbon nanotube.
Nanoscale
January 2018
School of Life Sciences, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.
Polarized Raman spectroscopy of a single-walled carbon nanotube (SWNT) was shown to serve as a simple alternative to sophisticated imaging tools for probing sub-diffraction optical phenomena. As a model system, we used TiO nanoparticles (n ∼ 2.67), which confine plane-polarized incident light (λ = 532 nm) into two bands less than 150 nm apart.
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