Ultrafast Terahertz Scattering Scanning Near-field Optical Microscope DOI Open Access
Youwei Wang,

马一航 Ma Yihang,

Jiayi Wang

et al.

Acta Physica Sinica, Journal Year: 2025, Volume and Issue: 74(14), P. 0 - 0

Published: Jan. 1, 2025

Terahertz (THz) time-domain spectroscopy and imaging techniques at the nanoscale are imperative for materials research devices detection, among others. However, conventional far-field THz faces inherent diffraction limits, restricting applications requiring femtosecond temporal resolution spatial precision carrier dynamics analysis. We present a scattering-type scanning near-field optical microscopy that overcomes these constraints by combining ultrafast with AFM. The utilization of interaction between needle's tip sample's surface has been demonstrated to facilitate study semiconductor static lateral ~60 nm. This, in turn, enables acquisition conductivity distributions materials. Additionally, it facilitates transient laser emission via photoexcited kinetic processes. This aspect provides substantial support performance nanometer resolution, time spectroscopic imaging.The experimental results show system signal-to-noise ratio as high 56.34 dB spectral mode, can effectively extract fifth-order harmonic signals covering 0.2-2.2 frequency band up Carrier excitation complexation processes topological insulators have successfully observed pump-THz probe better than 100 fs. Imaging SRAM samples reveals differences scattering intensity due non-uniformity doping concentration, validating its potential defect detection.This not only an innovative means electrical characterization devices, but also opens new avenues application technology interdisciplinary subjects such nanophotonics spintronics. In future, detection efficiency expected be further improved integrating superlens technology, optimizing design introducing deep learning algorithms.

Language: Английский

Polaritonic Fourier crystal DOI Creative Commons
Sergey G. Menabde, Yongjun Lim, К. В. Воронин

et al.

Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)

Published: March 14, 2025

Polaritonic crystals – periodic structures where the hybrid light–matter waves called polaritons can form Bloch states promise a deeply subdiffractional nanolight manipulation and enhanced light-matter interaction. In particular, in van der Waals materials boast extreme field confinement long lifetimes allowing for exploitation of wave phenomena at nanoscale. However, conventionally patterned nanostructures, are prone to severe scattering loss sharp material edges, making it challenging create functional polaritonic crystals. Here, we introduce concept Fourier crystal based on harmonic modulation polariton momentum pristine waveguide with minimal scattering. We employ hexagonal boron nitride (hBN) near-field imaging reveal neat well-defined band structure phonon-polaritons crystal, stemming from dominant excitation first-order mode. Furthermore, show that fundamental mode possesses bandgap even relatively lossy naturally abundant hBN. Thus, our work provides an alternative paradigm essential interaction, dispersion engineering, guiding. waveguide. Authors probe crystal.

Language: Английский

Citations

0
Infrared nano-spectroscopy and imaging on spatially confined nanomaterials DOI
Jun Nishida

Japanese Journal of Applied Physics, Journal Year: 2025, Volume and Issue: 64(4), P. 040802 - 040802

Published: April 1, 2025

Abstract As materials become spatially confined, their electronic and optical properties deviate significantly from those of bulk counterparts. In this review article, we highlight our recent applications infrared scattering scanning near-field microscopy (IR s-SNOM) to explore the distinct characteristics nanoconfined materials, providing insights into confinement-induced behavior light–matter interactions at single-nanometer scale sub-micron mesoscale. We specifically discuss direct observation phase transitions in individual nanoparticles through local conductivity measurements, characterization vibrational modes single-protein level, ultrafast nano-imaging electron–hole dynamics transition metal dichalcogenide flakes. Collectively, these underscore versatility IR s-SNOM elucidating unique diverse nanomaterials, ranging correlated low-dimensional biological molecules.

Language: Английский

Citations

0
Polaritonic quantum matter DOI Creative Commons
D. N. Basov, Ana Asenjo-Garcı́a, P. James Schuck

et al.

Nanophotonics, Journal Year: 2025, Volume and Issue: unknown

Published: May 5, 2025

Abstract Polaritons are quantum mechanical superpositions of photon states with elementary excitations in molecules and solids. The light–matter admixture causes a characteristic frequency-momentum dispersion shared by all polaritons irrespective the microscopic nature material that could entail charge, spin, lattice or orbital effects. retain strong nonlinearities their matter component simultaneously inherit ray-like propagation light. prompt new properties, enable opportunities for spectroscopy/imaging, empower simulations give rise to forms synthetic matter. Here, we review emergent effects rooted polaritonic quasiparticles wide variety physical implementations. We present broad portfolio platforms phenomena what term discuss unifying aspects across different implementations focus on recent developments in: imaging, cavity electrodynamics materials engineering, topology nonlinearities, as well polaritonics.

Language: Английский

Citations

0
Ultrafast Terahertz Scattering Scanning Near-field Optical Microscope DOI Open Access
Youwei Wang,

马一航 Ma Yihang,

Jiayi Wang

et al.

Acta Physica Sinica, Journal Year: 2025, Volume and Issue: 74(14), P. 0 - 0

Published: Jan. 1, 2025

Terahertz (THz) time-domain spectroscopy and imaging techniques at the nanoscale are imperative for materials research devices detection, among others. However, conventional far-field THz faces inherent diffraction limits, restricting applications requiring femtosecond temporal resolution spatial precision carrier dynamics analysis. We present a scattering-type scanning near-field optical microscopy that overcomes these constraints by combining ultrafast with AFM. The utilization of interaction between needle's tip sample's surface has been demonstrated to facilitate study semiconductor static lateral ~60 nm. This, in turn, enables acquisition conductivity distributions materials. Additionally, it facilitates transient laser emission via photoexcited kinetic processes. This aspect provides substantial support performance nanometer resolution, time spectroscopic imaging.The experimental results show system signal-to-noise ratio as high 56.34 dB spectral mode, can effectively extract fifth-order harmonic signals covering 0.2-2.2 frequency band up Carrier excitation complexation processes topological insulators have successfully observed pump-THz probe better than 100 fs. Imaging SRAM samples reveals differences scattering intensity due non-uniformity doping concentration, validating its potential defect detection.This not only an innovative means electrical characterization devices, but also opens new avenues application technology interdisciplinary subjects such nanophotonics spintronics. In future, detection efficiency expected be further improved integrating superlens technology, optimizing design introducing deep learning algorithms.

Language: Английский

Citations

0