Research Topics
| Toshihiko BabaSummaryAffiliation: Yokohama National University Country: Japan Publications
| Collaborators
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Detail Information
Publications
Continuously tunable slow-light device consisting of heater-controlled silicon microring arrayFumihiro Shinobu
Department of Electrical and Computer Engineering, Yokohama National University, Hodogaya ku, Yokohama, Japan
Opt Express 19:13557-64. 2011..Eye opening of 40 Gbps non-return-to-zero signals is observed at up to a 150 ps delay and a 4 bit buffering capacity is confirmed, which corresponds to a spatial buffering density of 0.29 kbit/mm2...
Large delay-bandwidth product and tuning of slow light pulse in photonic crystal coupled waveguideToshihiko Baba
Yokohama National University, Department of Electrical and Computer Engineering79 5 Tokiwadai, Hodogayaku, Yokohama 240 8501, Japan
Opt Express 16:9245-53. 2008..We propose a technique for externally controlling the chirping to permit variable delay. We demonstrate tuning of the pulse delay up to 23 ps, corresponding to a ~7 mm extension of the free space length...- Dispersion-controlled slow light in photonic crystal waveguidesToshihiko Baba
Department of Electrical and Computer Engineering, Yokohama National University, Yokohama 240 8501, Japan
Proc Jpn Acad Ser B Phys Biol Sci 85:443-53. 2009..Then the paper describes experimental observations of slow light pulse, exhibiting their record high values. It also demonstrates the nonlinear enhancement based on slow light pulse transmission... - Compact and fast photonic crystal silicon optical modulatorsHong C Nguyen
Department of Electrical and Computer Engineering, Yokohama National University, 79 5 Tokiwadai, Hodogayaku, Yokohama 240 8501, Japan
Opt Express 20:22465-74. 2012.... - Nonlinear light propagation in chalcogenide photonic crystal slow light waveguidesKeijiro Suzuki
Department of Electrical and Computer Engineering, Yokohama National University, 79 5 Tokiwadai, Hodogaya ku, Yokohama 240 8501, Japan
Opt Express 18:26675-85. 2010..We show that the waveguide exhibits negligible two-photon absorption, and also high-efficiency self-phase modulation and four-wave mixing, which are assisted by low-dispersion slow light... - Aberration reduction and unique light focusing in a photonic crystal negative refractive lensTomohiko Asatsuma
Yokohama National University, Department of Electrical and Computer Engineering 79 5 Tokiwadai, Hodogayaku, Yokohama 240 8501, Japan
Opt Express 16:8711-9. 2008..These results prove the feasibility of an in-plane free space optical network based on negative refraction... - Fabrication and characterization of chalcogenide glass photonic crystal waveguidesKeijiro Suzuki
Department of Electrical and Computer Engineering, Yokohama National University, 79 5 Tokiwadai, Hodogaya ku, Yokohama, 240 8501, Japan
Opt Express 17:22393-400. 2009..6 x 10(4) W(-1)m(-1). Four-wave mixing is also observed in the waveguide, while two-photon absorption at optical communication wavelengths is sufficiently small and the corresponding figure of merit is larger than 11... - Large tunable fractional delay of slow light pulse and its application to fast optical correlatorNorihiro Ishikura
Department of Electrical and Computer Engineering, Yokohama National University, 79 5 Tokiwadai, Yokohama, 240 8501, Japan
Opt Express 19:24102-8. 2011..Using this correlator, we successfully observed sub-picosecond pulses at a scan frequency up to 2 kHz, which is 100 times faster than that of mechanical scanners in conventional correlators... - Slow-light-based variable symbol-rate silicon photonics DQPSK receiverKeijiro Suzuki
Department of Electrical and Computer Engineering, Yokohama National University, 79 5 Tokiwadai, Hodogayaku, Yokohama, 240 8501, Japan
Opt Express 20:4796-804. 2012..Demodulation was confirmed at symbol-rates of 7.4 - 9.0 Gbaud, corresponding to bit-rates of 14.8 - 18.0 Gb/s... - 10 Gb/s operation of photonic crystal silicon optical modulatorsHong C Nguyen
Department of Electrical and Computer Engineering, Yokohama National University, Hodogayaku, Yokohama, Japan
Opt Express 19:13000-7. 2011..An open eye pattern is observed at bitrates of 10 Gb/s and 2 Gb/s, with and without pre-emphasis of the drive signal, respectively... - Refractive index sensing utilizing a cw photonic crystal nanolaser and its array configurationShota Kita
Yokohama National University, Department of Electrical and Computer Engineering, 79 5 Tokiwadai, Hodogayaku, Yokohama 240 8501, Japan
Opt Express 16:8174-80. 2008..These will be disposable sensors with very simple optical I/O. They are anticipated to be integrated with biochips and used for label-free single molecule detection... - Stopping of light by the dynamic tuning of photonic crystal slow light deviceYuji Saito
Department of Electrical and Computer Engineering, Yokohama National University, 79 5 Tokiwadai, Hodogayaku, Yokohama 240 8501, Japan
Opt Express 18:17141-53. 2010..Taking into account carrier distribution and free carrier absorption, the actual behaviors of stopped light are estimated. We define and evaluate an effective delay-bandwidth product, which is affected by free carrier absorption... - Super-sensitivity in label-free protein sensing using a nanoslot nanolaserShota Kita
Department of Electrical and Computer Engineering, Yokohama National University, Hodogayaku, Yokohama, Japan
Opt Express 19:17683-90. 2011..The specific adsorption of the protein is observed only around the nanoslot with strong laser intensity. This suggests that the super-sensitivity arises from the effective trapping of protein in the nanoslot... - Nonlinear enhancement in photonic crystal slow light waveguides fabricated using CMOS-compatible processMizuki Shinkawa
Opt Express 19:22208-18. 2011..Such slow light may add various functionalities in Si photonics, while loss reduction is desired for ensuring the advantage of slow light... - Slow light with low dispersion and nonlinear enhancement in a lattice-shifted photonic crystal waveguideYohei Hamachi
Department of Electrical and Computer Engineering, Yokohama National University, Yokohama, Japan
Opt Lett 34:1072-4. 2009..We observed delayed transmission of picosecond optical pulses, as well as two-photon absorption and self-phase modulation enhanced by a high internal light intensity in the slow-light regime... - Photonic crystal negative refractive opticsToshihiko Baba
Department of Electrical and Computer Engineering, Yokohama National University, 79 5 Tokiwadai, Hodogayaku, Yokohama 240 8501, Japan
J Nanosci Nanotechnol 10:1473-81. 2010..A compact wavelength demultiplexer can be designed by combining the prism and lens effects. The collimation effect is obtainable not only inside but also outside of the PC by optimizing negative refractive condition...