Surface phonon coupling within boron nitride resolved by a novel near-field infrared pump-probe imaging technique

2016 ◽  
Author(s):  
Leonid Gilburd ◽  
Xiaoji G. Xu ◽  
Sissi de Beer ◽  
Yoshio Bando ◽  
Dmitri Golberg ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Imaging Technique ◽  
Near Field ◽  
Phonon Coupling ◽  
Pump Probe ◽  
Surface Phonon

scholarly journals Surface Phonon Coupling within Boron Nitride Nanotubes Resolved by a Novel Near-Field Infrared Pump-Probe Imaging Technique.

2016 ◽  
Vol 22 (S3) ◽  
pp. 366-367
Author(s):  
Leonid Gilburd ◽  
Xiaoji G. Xu ◽  
Yoshio Bando ◽  
Dmitri Golberg ◽  
Gilbert C. Walker
Keyword(s):  
Boron Nitride ◽  
Imaging Technique ◽  
Near Field ◽  
Boron Nitride Nanotubes ◽  
Phonon Coupling ◽  
Pump Probe ◽  
Surface Phonon

Near-Field Infrared Pump–Probe Imaging of Surface Phonon Coupling in Boron Nitride Nanotubes

2016 ◽  
Vol 7 (2) ◽  
pp. 289-294 ◽  
Author(s):  
Leonid Gilburd ◽  
Xiaoji G. Xu ◽  
Yoshio Bando ◽  
Dmitri Golberg ◽  
Gilbert C. Walker
Keyword(s):  
Boron Nitride ◽  
Near Field ◽  
Boron Nitride Nanotubes ◽  
Phonon Coupling ◽  
Pump Probe ◽  
Surface Phonon

scholarly journals Single-shot imaging of surface molecular ionization in nanosystems

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Fenghao Sun ◽  
Hui Li ◽  
Shanshan Song ◽  
Fei Chen ◽  
Jiawei Wang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Strong Field ◽  
Imaging Technique ◽  
Near Field ◽  
Velocity Map Imaging ◽  
Single Shot ◽  
Surface Molecules ◽  
Nanoparticle Interactions ◽  
Field Response ◽  
Ion Species

Abstract Using single-shot velocity map imaging technique, explosion imaging of different ion species ejected from 50 nm SiO2 nanoparticles are obtained excitedly by strong near-infrared and ultraviolet femtosecond laser fields. Characteristic momentum distributions showing forward emission of the ions at low excitation intensities and shock wave behaviors at high intensities are observed. When the excitation intensity is close to the dissociative ionization threshold of the surface molecules, the resulting ion products can be used to image the instant near-field distributions. The underlying dynamics of shock formation are simulated by using a Coulomb explosion model. Our results allow one to distinguish the ultrafast strong-field response of various molecular species in nanosystems and will open a new way for further exploration of the underlying dynamics of laser-and-nanoparticle interactions.

scholarly journals High-Q dark hyperbolic phonon-polaritons in hexagonal boron nitride nanostructures

Nanophotonics ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 1457-1467 ◽  
Author(s):  
Georg Ramer ◽  
Mohit Tuteja ◽  
Joseph R. Matson ◽  
Marcelo Davanco ◽  
Thomas G. Folland ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Cross Sections ◽  
Hexagonal Boron Nitride ◽  
Near Field ◽  
High Q ◽  
Surface Phonon Polaritons ◽  
Previous Hypothesis ◽  
Phonon Polaritons ◽  
Field Reflectance ◽  
Strong Confinement

AbstractThe anisotropy of hexagonal boron nitride (hBN) gives rise to hyperbolic phonon-polaritons (HPhPs), notable for their volumetric frequency-dependent propagation and strong confinement. For frustum (truncated nanocone) structures, theory predicts five, high-order HPhPs, sets, but only one set was observed previously with far-field reflectance and scattering-type scanning near-field optical microscopy. In contrast, the photothermal induced resonance (PTIR) technique has recently permitted sampling of the full HPhP dispersion and observing such elusive predicted modes; however, the mechanism underlying PTIR sensitivity to these weakly-scattering modes, while critical to their understanding, has not yet been clarified. Here, by comparing conventional contact- and newly developed tapping-mode PTIR, we show that the PTIR sensitivity to those weakly-scattering, high-Q (up to ≈280) modes is, contrary to a previous hypothesis, unrelated to the probe operation (contact or tapping) and is instead linked to PTIR ability to detect tip-launched dark, volumetrically-confined polaritons, rather than nanostructure-launched HPhPs modes observed by other techniques. Furthermore, we show that in contrast with plasmons and surface phonon-polaritons, whose Q-factors and optical cross-sections are typically degraded by the proximity of other nanostructures, the high-Q HPhP resonances are preserved even in high-density hBN frustum arrays, which is useful in sensing and quantum emission applications.

Ultrafast relaxation investigated by Photoelectron Circular Dichroism : an isomeric comparison of Camphor and Fenchone

2021 ◽  
Author(s):  
Valérie Blanchet ◽  
Dominique Descamps ◽  
stephane Petit ◽  
Yann Mairesse ◽  
bernard Pons ◽  
...  
Keyword(s):  
Circular Dichroism ◽  
Imaging Technique ◽  
Velocity Map Imaging ◽  
Relaxation Dynamics ◽  
Time Resolved ◽  
Pump Probe ◽  
Ultrafast Relaxation ◽  
Circular Dichroïsm ◽  
Isomeric Effects

We study isomeric effects using time resolved photoelectron circular dichroism (PECD). By a (1+1’)pump-probe ionisation with photoelectron collected by velocity map imaging technique, we compare relaxation dynamics from the 3s-Rydberg...

scholarly journals A FAST 3D IMAGING TECHNIQUE FOR NEAR-FIELD CIRCULAR SAR PROCESSING

2012 ◽  
Vol 129 ◽  
pp. 271-285 ◽  
Author(s):  
Wei Yan ◽  
Jia-Dong Xu ◽  
Gao Wei ◽  
Li Fu ◽  
Hua-Bing He
Keyword(s):  
3D Imaging ◽  
Imaging Technique ◽  
Near Field ◽  
Sar Processing
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