Abstract
Two-dimensional Photonic Crystal (PhC) membrane lasers are promising candidates for integrated photonic applications, especially in board-to-board and chip-to-chip interconnections [1]. These lasers are normally built on air-bridged PhC slabs with a thickness of a few hundred nanometers. A line-defect cavity (denoted at LN) can be realized by omitting a number (N) of air-holes in a row from the PhC structure. Such a cavity structure has the potentials of achieving high quality factor, lowering lasing threshold and engineering group refractive index. Many impressive achievements have already been reported, including a measured Q factor of 45,000 [2], a record-low 4.8 µA lasing threshold [3], and greatly enhanced gain in PhC waveguides by slow-light propagation [4]. However, to the best of our knowledge, the dependence of lasing threshold on slow-light was not yet carefully investigated and is not understood. In this work, we experimentally study the threshold properties for different cavity lengths quantized by the number of missing holes. Suprisingly, we observe an optimum cavity length where the laser threshold pump density is minimum. We show that this can be understood as a combined consequence of slow-light propagation and disorder in the structure.
© 2015 IEEE
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