Graded photonic crystal terahertz quantum cascade lasers
- 18 January 2010
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 96 (3)
- https://doi.org/10.1063/1.3273056
Abstract
The use of integrated photonic structures to tailor the behavior of light is extremely promising for optimizing performance and for introducing advanced functionalities into optoelectronic devices. We demonstrate a powerful method based on photonic-band engineering which allows the optimization of the resonator quality factors of devices operating on band-edge photonic-crystal states. We also show that carefully designed π-shifts in two-dimensional photonic-resonators give enhanced beam properties. The application of these general techniques to terahertz quantum cascade lasers yields improved maximum operating temperatures, and angularly narrow, single-lobed surface emission of ≈12°×8°. The devices operate at ≈2.8/2.9 THz, with peak output powers of 5 mW at 78 K.Keywords
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