Low-threshold Photonic Crystal Laser and High-Q Cavity

초록

Photonic crystals are representative nano-photonic structures and expected to play an important role in the future optical integrated circuit. In this talk, we will introduce experimental demonstration of novel laser operations and theoretical investigation of high quality-factor (Q) resonant modes in the photonic crystal nano-cavity structures. Photonic crystal lasers were fabricated in the form of two-dimensional photonic crystal air-bridge slab structures made of InGaAsP materials emitting at 1.55 mm, and lasing characteristics were investigated by optical pumping. When the nano-cavity was introduced in the air-bridge slab structure, low-threshold lasing action has been realized by room-temperature pulse pumping. High-Q resonant modes were analyzed by numerical optimization based on the finite-difference time-domain method, and the Q of >10^6 has been obtained in a wavelength-sized photonic crystal cavity. After introducing the achievements reported by our group, recent development of photonic crystal lasers and high-Q photonic crystal cavity modes will be reviewed.