Highly efficient and tunable microlasers on photonic crystal slab

Summary form only given. Photonic crystal (PC) is acknowledged as an enabling science and technology of the manipulating photons in the size of micrometers. The research in PC integrated circuits is driven by the advantages seen in the variety of 2D PC slab devices, such as the ultrasmall cavity laser, ultra-low loss sharp bend waveguide, high performance and small sized beam splitters and so on. Analogous to electronic integrated circuits, integrating photonic functions on a PC chip allows the realization of cheaper and more compact optical systems with higher performance. As one of the key components, PC edge-emitting microcavity laser attracts many interests. In the experiment, the MOCVD-grown InGaAsP/InP wafer including seven 9-nm thick QWs whose gain peak was at 1.538 mum was employed. The device was fabricated by typical nanofabrication processing. Optical pumped lasers shows high out efficiency over 20%, and single modes with a large side mode suppression of 37 dB. The microcavity shows tunable lasing characteristics depending on the selective mode pumping. We believe that this is a promising result for large scale active photonic integration in the PCs.