学術雑誌論文

学術雑誌論文

text

Japanese Journal of Applied Physics. 2012, 51, p. 07GA08

Picosecond ultrasound spectroscopy with a stable fiber laser for ultrahigh-frequency-oscillator applications : From nanomechanics to biosensors

The Japan Society of Applied Physics

英語

text

2012-07-20

https://doi.org/10.1143/JJAP.51.07GA08

Hirotsugu Ogi, Tetsuya Kawamoto, Yohei Nakamichi and Masahiko Hirao. Picosecond ultrasound spectroscopy with a stable fiber laser for ultrahigh-frequency-oscillator applications: From nanomechanics to biosensors. Japanese Journal of Applied Physics, 2012, 51(7S), 07GA08. https://doi.org/10.1143/JJAP.51.07GA08.

We developed a stable picosecond-ultrasound-spectroscopy system with a fiber-laser light source. A linearly polarized light pulse with 532nm wavelength is split into pump and probe light pulses using a polarized beam splitter (PBS). The ultrahigh-frequency acoustic waves excited by the pump light pulse are successfully detected using the delayed probe light pulse with a signal-to-noise ratio higher than that of the traditional titanium-sapphire pulse laser. The wavelength used allows deep inspection of silicon because of less light absorption. The developed system is also applied to a biosensor with an ultrathin Pt film resonator, which shows significantly improved stability at 100 GHz. The amount of frequency change caused by the adsorption of target molecules is of the order of 10⁻², which is much higher than that detected with conventional oscillator biosensors by a factor of 10⁴.

84166

Picosecond ultrasound spectroscopy with a stable fiber laser for ultrahigh-frequency-oscillator applications : From nanomechanics to biosensors

The Japan Society of Applied Physics

英語

2012-07-20

Japanese Journal of Applied Physics

51

07GA08

https://doi.org/10.1143/JJAP.51.07GA08

https://hdl.handle.net/11094/84166