scholarly journals Broad Frequency Shift of Parametric Processes in Epsilon-Near-Zero Time-Varying Media

2020 ◽  
Vol 10 (4) ◽  
pp. 1318 ◽  
Author(s):  
Vincenzo Bruno ◽  
Stefano Vezzoli ◽  
Clayton DeVault ◽  
Enrico Carnemolla ◽  
Marcello Ferrera ◽  
...  
Keyword(s):  
Frequency Shift ◽  
Frequency Conversion ◽  
Laser Pulses ◽  
Time Varying ◽  
Wave Mixing ◽  
Transmitted Radiation ◽  
Short Laser Pulses ◽  
Parametric Processes ◽  
Zero Time ◽  
Epsilon Near Zero

The ultrafast changes of material properties induced by short laser pulses can lead to a frequency shift of reflected and transmitted radiation. Recent reports highlight how such a frequency shift is enhanced in spectral regions where the material features a near-zero real part of the permittivity. Here, we investigate the frequency shift for fields generated by four-wave mixing. In our experiment, we observed a frequency shift of more than 60 nm (compared to the pulse width of ∼40 nm) in the phase conjugated radiation generated by a 500 nm aluminium-doped zinc oxide (AZO) film pumped close to the epsilon-near-zero wavelength. Our results indicate applications of time-varying media for nonlinear optics and frequency conversion.

Adiabatic Frequency Conversion Using a Time-Varying Epsilon-Near-Zero Metasurface

Nano Letters ◽  
2021 ◽  
Author(s):  
Kai Pang ◽  
M. Zahirul Alam ◽  
Yiyu Zhou ◽  
Cong Liu ◽  
Orad Reshef ◽  
...  
Keyword(s):  
Frequency Conversion ◽  
Time Varying ◽  
Epsilon Near Zero

Investigation of Quantum Beatings at 608 cm-1 and 70 cm-1 in Rb Vapor

2011 ◽  
Vol 181-182 ◽  
pp. 413-416 ◽  
Author(s):  
Chang Jun Zhu ◽  
Jun Fang He ◽  
Xue Jun Zhai ◽  
Bing Xue ◽  
Chong Hui Zhang
Keyword(s):  
Fourier Transform ◽  
Laser Pulses ◽  
Time Varying ◽  
Wave Mixing ◽  
Mixing Processes ◽  
Optical Wave ◽  
Pump Probe ◽  
Rb Vapor ◽  
Frequency Components ◽  
Beating Frequency

Two coupled axially phase matched parametric four-wave mixings have been achieved in Rb vapor by using broad bandwidth laser pulses. Coherent radiations at 420 nm produced by difference-frequency optical wave mixing processes were detected and a pump-probe scheme was employed to record time varying characteristics of the parametric four-wave mixing signals. Quantum beatings at 608 cm-1 and 70 cm-1 were retrieved from the time varying signals by Fourier transform. Moreover, time dependent Fourier transform was utilized to analyze the dynamics of quantum beatings. The results indicate that two wave packets associated with the two quantum beating frequency components interact strongly and the quantum beating dynamics can be controlled by adjusting Rb number density.

Photon Acceleration Using a Time-Varying Epsilon-near-Zero Metasurface

ACS Photonics ◽  
2021 ◽  
Author(s):  
Cong Liu ◽  
M. Zahirul Alam ◽  
Kai Pang ◽  
Karapet Manukyan ◽  
Orad Reshef ◽  
...  
Keyword(s):  
Time Varying ◽  
Photon Acceleration ◽  
Epsilon Near Zero

scholarly journals Production of ion beams in high-power laser–plasma interactions and their applications

2004 ◽  
Vol 22 (1) ◽  
pp. 19-24 ◽  
Author(s):  
F. PEGORARO ◽  
S. ATZENI ◽  
M. BORGHESI ◽  
S. BULANOV ◽  
T. ESIRKEPOV ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Medical Physics ◽  
Ion Beam ◽  
Laser Pulses ◽  
Ion Beams ◽  
Laser Plasma Interactions ◽  
Physical Mechanisms ◽  
Short Laser Pulses ◽  
Laser Pulse Intensity ◽  
Target Design

Energetic ion beams are produced during the interaction of ultrahigh-intensity, short laser pulses with plasmas. These laser-produced ion beams have important applications ranging from the fast ignition of thermonuclear targets to proton imaging, deep proton lithography, medical physics, and injectors for conventional accelerators. Although the basic physical mechanisms of ion beam generation in the plasma produced by the laser pulse interaction with the target are common to all these applications, each application requires a specific optimization of the ion beam properties, that is, an appropriate choice of the target design and of the laser pulse intensity, shape, and duration.

Mechanisms of nanoparticle formation by short laser pulses

2007 ◽  
Author(s):  
Tatiana E. Itina ◽  
Mikhail E. Povarnitsyn ◽  
Karine Gouriet ◽  
Sylvie Noël ◽  
Jörg Hermann
Keyword(s):  
Laser Pulses ◽  
Nanoparticle Formation ◽  
Short Laser Pulses
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