Results 71 to 80 of about 1,799,704 (293)

Terahertz Spectral Signatures of Ultrafast Spin Transports in Ferromagnetic Heusler Alloy

Advanced Physics Research, 2023
Although the Co‐based Heusler compounds are predicted to be half‐metals, their sub‐picosecond demagnetization dynamics upon laser excitation show a transition‐metal‐like behavior.
Zuanming Jin, Yingyu Guo, Yan Peng, Zeyu Zhang, Jinyi Pang, Zongzhi Zhang, Fan Liu, Bin Ye, Yexin Jiang, Guohong Ma, Chao Zhang, Alexey V. Balakin, Alexander P. Shkurinov, Yiming Zhu, Songlin Zhuang   +14 more
doaj   +1 more source

Spectrally resolved wave-mixing between near- and far-infrared pulses in gas [PDF]

, 2013
We investigate the nonlinear wave-mixing in gases between intense, short optical pulses and long-wavelength fields (mid infrared and terahertz). We show numerically that the beating between the sum- and difference-frequency generation components can be ...
Schmidt, Bruno E., Ozaki, T, Morandotti, R., M Clerici (16177538), Caspani, Lucia, M Shalaby (12138066), Shalaby, M., Vidal, Francois, Ozaki, Tsuneyuki, D Faccio (16177541), B Schmidt (9979535), Clerici, Matteo, Peccianti, M, F Vidal (6971162), Morandotti, Robert, T Ozaki (16177550), Yaakobi, O., Caspani, L, Peccianti, Marco, Schmidt, Bruno E, Shalaby, Mostafa, Marco Peccianti (4464661), Clerici, M, L Caspani (16177544), F Légaré (13690585), Légaré, François, Vidal, F., Morandotti, R, Yaakobi, Oded, O Yaakobi (16177547), Faccio, Daniele, Shalaby, M, Faccio, D, Schmidt, B E, Yaakobi, O, R Morandotti (16168658), Vidal, F, Légaré, F, M Clerici, L Caspani, Ozaki T, Schmidt BE, Morandotti R, R Morandotti, M Shalaby, Faccio D, Yaakobi O, Vidal F, Legare F, D Faccio, M Peccianti, F Légaré, O Yaakobi, Peccianti M, B E Schmidt, Caspani L, T Ozaki, Shalaby M, Clerici M, F Vidal   +59 more
core   +1 more source

Unlocking Terahertz Steganography: Authentication of Hidden Images in Flexible Media

Advanced Materials Technologies, EarlyView.
Hidden information in multilayered devices, such as steganographic portraits, is detected and authenticated using reflection‐mode terahertz time‐domain imaging. Image reconstruction relies on a dedicated figure‐of‐merit obtained by integrating the signal intensity over the time‐window associated with the reflection from the metallic mirror backing the ...
Tiziana Ritacco, Francesca Vittorioso, Dimitrios C. Zografopoulos, Romeo Beccherelli, Walter Fuscaldo   +4 more
wiley   +1 more source

Inverse Optical Contrast in Metastable GeTe2: An Anomaly Enabling Low‐Loss Phase Change Photonics

Advanced Optical Materials, EarlyView.
An anomalous optical phase inversion in GeTe2$\mathrm{GeTe_{2}}$ provides a new platform for low‐loss non‐volatile integrated photonics at 1550 nm. The transition from the amorphous state (1) to a metastable vdW−GeTe2$\mathrm{vdW-GeTe_{2}}$ crystalline phase (2) is driven by bandgap widening, resulting in a negative refractive index change (Δn$\Delta ...
Jan Prikryl, Jan Mistrik, Milos Krbal
wiley   +1 more source

High-Field Nonlinear Terahertz Conductivities of Iron Ultrathin Films

Nanomaterials
The electronic transport behavior in ferromagnetic thin films critically dictates the functionality and efficiency of devices in spintronics and modern materials science.
Lewen Zhu, Zhiqiang Lan, Yingyu Guo, Danni Li, Lin Xi, Huiping Zhang, Zuanming Jin   +6 more
doaj   +1 more source

UC Food Waste: A Multimodal Robotic Perception Dataset for Robust Contaminant Detection in Complex Biowaste Scenes

Advanced Robotics Research, EarlyView.
A balanced multimodal food‐waste dataset and a novel Split Spatial‐Spectral Attention fusion framework are presented for robotic contaminant detection. Separate processing of RGB, thermal, and multispectral inputs preserves subtle material signatures before feature integration, reducing modality interference and improving classification and ...
Matthew Vestal, James Ireland, David Hinwood, Xing Wang, Min Wang, Damith Herath   +5 more
wiley   +1 more source

Interconversion of Optical to Terahertz Pulses in Nonlinear Beta Barium Borate Crystal

Advanced Physics Research
Low‐temperature β‐phase barium borate (β‐BBO) is an important nonlinear crystal, widely utilized for optical second‐harmonic (SH) generation. Recent re‐measurements of refractive indices in the terahertz (THz) range reveal that β‐BBO is a positive ...
Yingyu Guo, Boyuan Chen, Zhangshun Li, Zhiqiang Lan, Huiping Zhang, Lin Xi, Zuanming Jin, Yan Peng, Yiming Zhu   +8 more
doaj   +1 more source

Enhanced Modulation of Terahertz Generation in Optically Pumped Silicon-Based CoFeB/Ir Heterostructures

Nanomaterials
Silicon-compatible spintronic terahertz emitters (STEs) are crucial for on-chip ultrafast optoelectronic integration, yet their all-optical controllability remains a key challenge.
Ruijie Peng, Zuanming Jin, Yexing Jiang, Huiping Zhang, Wei He, Yan Peng   +5 more
doaj   +1 more source

Study of multi-long-pulse thermography using high-power fiber lasers

AIP Advances, 2023
Active infrared thermography tests are performed using a high-power continuous fiber laser as the excitation source. Multi-long-pulses (MLPs) are used to detect deep defects in samples with reduced heating.
Gangbo Hu, Xue Yang, Xiangyu Wang, Wei Fang, Ning Tao   +4 more
doaj   +1 more source

A compact, continuous-wave terahertz source based on a quantum-cascade laser and a miniature cryocooler [PDF]

, 2010
We report on the development of a compact, easy-to-use terahertz radiation source, which combines a quantum cascade laser (QCL) operating at 3.1 THz with a compact, low input-power Stirling cooler.
Semenov, Alexey, Richter, Heiko, Schrottke, Lutz, Grahn, H. T., Giehler, M., Wienold, Martin, Huebers, H.-W., Pavlov, Sergey, Greiner-Bär, Michael, Hey, R., Semenov, Alexei D.   +10 more
core   +1 more source