Alan H. Chin

Near-infrared semiconductor subwavelength-wire lasers

We report near-infrared lasing in the telecommunications band in gallium antimonide semiconductor subwavelength wires. Our results open the possibility of the use of semiconductor subwavelength-wire lasers in future photonic integrated circuits for telecommunications applications.

Picosecond time-resolved cyclotron resonance in semiconductors

A promising method for studying intraband carrier dynamics in semiconductors is monitoring the evolution of far-infrared (FIR) absorption induced by photoexcited carriers. By monitoring the photoinduced FIR absorption as a function of magnetic field, we performed time-resolved cyclotron resonance of photocreated electrons in InSb with picosecond resolution.

Extreme mid-infrared nonlinear optics in semiconductors

We have made the first observation, to our knowledge, of multiple off-resonance optical sidebands, multiple mid-infrared harmonics, and harmonic-continuum generation in semiconductors in the presence of intense mid-infrared laser fields.

Near-infrared subwavelength-wire lasers

We report the first observation of near-infrared (NIR) lasing in subwavelength semiconductor wires. The optically-pumped GaSb subwavelength-wire-based lasers promise to be useful for future NIR photonic integrated circuits and systems.

Direct observation of intraband carrier relaxation phenomena in semiconductors with a picosecond free-electron laser

We have performed time-resolved terahertz (THz) - near-IR (NIR) two-color spectroscopy on InSb, using the Stanford picosecond free-electron laser synchronized with a femtosecond NIR Ti:Sapphire laser. The initial NIR pulse excites non-equilibrium electron and holes, which absorb the picosecond THz pulse. The time profile of the photo-induced absorption is a sensitive probe of intraband carrier relaxation dynamics. Using these techniques we have made the first observation of time-resolved cyclotron resonance (TRCR) of photo-created electronics in InSb for time delays from a few picoseconds to several tens of nanoseconds. This TRCR data shows possible evidence of a magnetic-field- induced LO-photon bottleneck effect. Furthermore, we have detected very unusual multi-component relaxation and photo- induced transparency under certain conditions.