INTENSE THz-RADIATION SOURCES USING SEMICONDUCTORS IRRADIATED WITH FEMTOSECOND LASER PULSES IN A MAGNETIC FIELD

1999 ◽  
Vol 08 (01) ◽  
pp. 71-87 ◽  
Author(s):  
SHINJI IZUMIDA ◽  
SHINGO ONO ◽  
ZHENLIN LIU ◽  
HIDEYUKI OHTAKE ◽  
NOBUHIKO SARUKURA
Keyword(s):  
Magnetic Field ◽  
Radiation Power ◽  
Laser Pulses ◽  
Excitation Power ◽  
Femtosecond Laser Pulses ◽  
Bragg Reflector ◽  
Thz Radiation ◽  
Radiation Sources ◽  
Excitation Laser ◽  
The Magnetic Field

We report significant enhancement of THz radiation from InAs under magnetic field irradiated with femtosecond pulses. The THz-radiation power is significantly enhanced and reaches sub-mW level in a 1.7-T magnetic field with 1.5-W excitation power. The THz-radiation power is related almost quadratically both to the magnetic field and excitation laser power. Furthermore, the radiation spectrum is found to be controlled by the excitation pulsewidth, chirp direction of the excitation pulse, and the magnetic field. Additionally, we have demonstrated a new method to generate THz radiation from a saturable Bragg reflector in a magnetic field.

THz-radiation Generation from an Intracavity Saturable Bragg Reflector in a Magnetic Field

1998 ◽  
Vol 37 (Part 2, No. 2A) ◽  
pp. L125-L126 ◽  
Author(s):  
Nobuhiko Sarukura ◽  
Hideyuki Ohtake ◽  
Zhenlin Liu ◽  
Taro Itatani ◽  
Takeyoshi Sugaya ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Bragg Reflector ◽  
Thz Radiation ◽  
Radiation Generation

scholarly journals External Field-Controlled Ablation: Magnetic Field

Nanomaterials ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 1662 ◽  
Author(s):  
Jovan Maksimovic ◽  
Soon Hock Ng ◽  
Tomas Katkus ◽  
Bruce C. C. Cowie ◽  
Saulius Juodkazis
Keyword(s):  
Magnetic Field ◽  
External Field ◽  
Surface Plasmon Polariton ◽  
Femtosecond Laser Ablation ◽  
Laser Pulses ◽  
Periodic Patterns ◽  
Fs Laser ◽  
Application Potential ◽  
Field Lines ◽  
The Magnetic Field

The femtosecond laser ablation of silicon amidst an externally applied magnetic field in different orientations was investigated with respect to the scanning direction and polarisation of the laser beam, by observation of ablation patterns and debris displacement in a range of fluences, magnetic fields strengths, and geometries. Ultra-short ∼ 230 fs laser pulses of 1030 nm wavelengths were utilised in the single and multi-pulse irradiation modes. Ablation with an externally applied magnetic B-field B e x t ≈ 0.15 T was shown to strongly affect debris formation and deposition. The mechanism of surface plasmon polariton (SPP) wave can explain the ablated periodic patterns observed with alignment along the magnetic field lines. The application potential of external field controlled ablation is discussed.

Terahertz radiation from multiferroic BiFeO3 thin films as a new approach for ferroelectric memory readout and ferroelectric domain imaging microscopy

2005 ◽  
Vol 902 ◽  
Author(s):  
Kouhei Takahashi ◽  
Noriaki Kida ◽  
Masayoshi Tonouchi
Keyword(s):  
Thin Films ◽  
Nonvolatile Memory ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Ferroelectric Domain ◽  
Thz Radiation ◽  
New Approach ◽  
Multiferroic Bifeo ◽  
Multiferroic Bifeo3 ◽  
Nonvolatile Memory Devices

AbstractWe have observed novel terahertz (THz) radiation characteristics of multiferroic BiFeO3 thin films upon illumination of femtosecond laser pulses. The radiated THz pulses from BiFeO3 thin films were shown to originate from an ultrafast modulation of spontaneous polarization, which was introduced by the photoexcited charge carriers. Based on our findings, we briefly present new approaches to nondestructive readout for nonvolatile memory devices and ferroelectric domain imaging microscopy using THz radiation as a sensitive probe.

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