Engineered far-fields of metal-metal terahertz quantum cascade lasers with integrated planar horn structures

Abstract : The far-field emission profile of terahertz quantum cascade lasers (QCLs) in metal-metal waveguides is controlled in directionality and form through planar horn-type shape structures, whilst conserving a broad spectral response. The structures produce a gradual change in the high modal confinement of the waveguides and permit an improved far-field emission profile and resulting in a four-fold increase in the emitted output power. The two-dimensional far-field patterns are measured at 77 K and are agreement in with 3D modal simulations. The influence of parasitic high-order transverse modes is shown to be controlled by engineering the horn structure (ridge and horn widths), allowing only the fundamental mode to be coupled out.
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Optics Express, Optical Society of America, 2016, 24 (3), pp.9. 〈10.1364/OE.24.002174〉
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F Wang, I Kundu, L Chen, Lianhe Li, Edmund H. Linfield, et al.. Engineered far-fields of metal-metal terahertz quantum cascade lasers with integrated planar horn structures. Optics Express, Optical Society of America, 2016, 24 (3), pp.9. 〈10.1364/OE.24.002174〉. 〈hal-01277653〉

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