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Upham, Jeremy,Fujita, Yuu,Kawamoto, Yousuke,Tanaka, Yoshinori,Song, Bong Shik,Asano, Takashi,Noda, Susumu Optical Society of America 2013 Optics express Vol.21 No.3
<P>We develop a silicon photonic crystal nanocavity device capable of performing targeted optical pulse capture and release via distinct ports on demand, based on dynamic Q factor control. The capture of 4 ps pulses and their release up to 332 ps later is directly observed by time-resolved measurements of the energy behaviour in both the nanocavity and emitted from the release port. We also discuss how the behaviour of excited free carriers dictates the performance of such dynamic devices. (C) 2013 Optical Society of America</P>
Suppression of multiple photon absorption in a SiC photonic crystal nanocavity operating at 1.55 μm.
Yamada, Shota,Song, Bong-Shik,Upham, Jeremy,Asano, Takashi,Tanaka, Yoshinori,Noda, Susumu Optical Society of America 2012 Optics express Vol.20 No.14
<P>We show that a SiC photonic crystal cannot only inhibit two photon absorption completely, but also suppress higher-order multiple photon absorption significantly at telecommunication wavelengths, compared to conventional Si-based photonic crystal nanocavities. Resonant spectra of a SiC nanocavity maintain a Lorentzian profile even at input energies 100 times higher than what can be applied to a Si nanocavity without causing nonlinear effects. Theoretical fitting of the results indicates that the four photon absorption coefficient in the SiC nanocavity is less than 2.0 10(-5) cm(5)/GW(3). These results will contribute to the development of high-power applications of SiC nanocavities such as harmonic generation, parametric down conversion, and Raman amplification.</P>
Multiple-channel wavelength conversions in a photonic crystal cavity.
Jeon, Seungwoo,Song, Bong-Shik,Yamada, Shota,Yamaguchi, Yuki,Upham, Jeremy,Asano, Takashi,Noda, Susumu Optical Society of America 2015 Optics express Vol.23 No.4
<P>We demonstrate multiple-channel wavelength conversions of second harmonic and sum frequency generations in a silicon carbide photonic crystal cavity. The cavity is designed to have multiple modes including a nanocavity mode and Fabry-P?rot modes. Multiple-channel wavelength conversions in the nanocavity and Fabry-P?rot modes are shown experimentally. Furthermore, we investigate the polarization characteristics of wavelength-converted light. The experimental results of the polarization are in good agreement with calculation.</P>