Masato Takiguchi, Ph. D.

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Telecom-band Nanowire PhC Laser

We demonstrated an InAsP/InP single-nanowire telecom-band laser (diameter ~100 nm) on Si photonic crystal platform for the first time.
We reported the pulsed laser oscillation in 2015 [Takiguchi, et. al., IPC 2015]. Using the same system, we also demonstrated CW laser
and 10 Gbit/s optical modulation using a SSPD and a TCSPC module. From this result, we obtained clear opened eye-diagram
by superimposing the averaged PRBS data over a specific time period [Takiguchi, et. al., APL photonics 2017]. About this result, NTT
and AIP have sent out a press release [NTT press release, AIP Journals in the News].


Fast & High β Embedded MQW PhC Laser

We study spontaneous emission control and lasing oscillation of embedded multiple quantum well (MQW) in InP photonic crystal
nanocavities. We observed large emission rate ratio between the on- and off-resonant conditions of 30:1. This is the highest ratio reported
for MQW nano-laser[Takiguchi, et. al., APL 2013] . By adopting high β embedded multiple quantum well photonic crystal nanocavities, we
have also demonstrated smoothlasing transition, which indicates thresholdless-like lasing theoretically predicted, by mean of L-L curve
analysis, linewidth analysis, and photon correlation measurements[Takiguchi, et. al., OE 2016].