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Nishizawa S.,Advanced Infrared Spectroscopy Co. | Nishizawa S.,Shinshu University | Suzuki Y.,Zensei Pharmaceutical Industries Co. | Iwamoto T.,Shinshu University | And 2 more authors.
IRMMW-THz 2010 - 35th International Conference on Infrared, Millimeter, and Terahertz Waves, Conference Guide | Year: 2010

Terahertz time-domain spectroscopy technique has recently been in progress with advantages over other conventional techniques and with a wide range of industrial applications. One of the latest industrial applications focusing on the quality control on pharmaceutical products will be described. © 2010 IEEE. Source


Tani M.,University of Fukui | Yamamoto K.,University of Fukui | Estacio E.S.,University of Fukui | Que C.T.,University of Fukui | And 5 more authors.
Journal of Infrared, Millimeter, and Terahertz Waves | Year: 2012

Recent studies on the techniques and development of photoconductive (PC) semiconductor devices for efficient generation and detection of terahertz (THz) pulsed radiation are reported. Firstly, the optimization of PC antenna design is discussed. The PC detection of THz pulsed radiation using low-temperature grown GaAs with 1.55-μm wavelength probe is then described. Finally, the enhancement of THz radiation from InSb by using a coupling lens and magnetic field is investigated. These results reveal valuable insights on the design of an efficient, compact, and cost-effective THz time-domain spectroscopy system based on 1.55-μm fs laser sources. © Springer Science+Business Media, LLC 2012. Source


Estacio E.S.,University of Fukui | Estacio E.S.,University of the Philippines at Diliman | Hibi M.,University of Fukui | Saito K.,University of Fukui | And 7 more authors.
Journal of Infrared, Millimeter, and Terahertz Waves | Year: 2013

The characteristics of low temperature-grown GaAs photoconductive antenna (PCA) terahertz detectors probed by 1.56 μm laser pulses are investigated. The influence of TM and TE polarized probe, as well as the saturation characteristics are studied for 2 μm- and 5 μm-gap PCA's. Different polarization characteristics at low probe powers and at the saturation regimes were observed. Results are explained in terms of the polarization-dependent photocarrier distribution at the PCA gap arising from tight focusing. This work also demonstrates using a 1.56 μm probe for a GaAs PCA to achieve ∼60 dB SNR; matching its performance characteristics for above-bandgap probes. © 2013 Springer Science+Business Media New York. Source


Miyamaru F.,Shinshu University | Miyamaru F.,Japan Science and Technology Agency | Yamamoto K.,University of Fukui | Furuya T.,University of Fukui | And 2 more authors.
IRMMW-THz 2010 - 35th International Conference on Infrared, Millimeter, and Terahertz Waves, Conference Guide | Year: 2010

The dependence of the emission spectrum of terahertz (THz) radiation on the geometrical parameters of the dipole antenna, and the relationship between these parameters and the temporal characteristics of the transient input field is reported. The emission intensity and the peak frequency strongly depend on these geometrical parameters. © 2010 IEEE. Source


Furuya T.,University of Fukui | Estacio E.S.,University of Fukui | Horita K.,University of Fukui | Que C.T.,University of Fukui | And 5 more authors.
Japanese Journal of Applied Physics | Year: 2013

We propose a high-speed scanning terahertz (THz) time-domain spectrometer (TDS) based on optical sampling by repetition frequency modulation (OSREFM) using a repetition-frequency-tunable femtosecond fiber laser. Repetition frequency modulation is controlled by a highly stabilized external sweep generator. The fast scan of the time-delay between the pump and probe pulses is similar to an optical sampling with cavity tuning (OSCAT) THz-TDS system. However, the advantage of this technique is that it does not require physically moving components and uses only one laser system having an electronically modulated repetition rate. The time window and scanning time of this system depend on the modulation frequency range and the sweeping speed of the laser. In this study, we demonstrate the acquisition of a ̃300 ps-window THz time waveform within 3ms at a scan rate of 333Hz. © 2013 The Japan Society of Applied Physics. Source

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