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Terahertz bound-to-continuum quantum-cascade lasers based on optical-phonon scattering extraction
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Self-consistent solution of coupled Schrödinger and Poisson’s equations for two periods of the structure N314 at a temperature . Layer sequence in nm starting from injection barrier is as follows: (underlined layer is Si doped at , figures in bold type are layers). (b) SEM image of one double metal ridge waveguide of sample N314; the brighter layer under the ridge is the soldering layer.

Image of FIG. 2.
FIG. 2.

(a) Pulsed LI–IV curves of a 2.2 mm long, -wide single-plasmon laser ridge with high-reflection (HR) backfacet coating measured with a calibrated thermopile powermeter at a 2.5% duty cycle (125 kHz repetition rate); (b) cw operation of a 1.12-mm-long, -wide single-plasmon waveguide device with HR backfacet coating together with differential resistance (left axis) that shows typical discontinuity at threshold. The features in light emission and differential resistance correspond to mode jumps.

Image of FIG. 3.
FIG. 3.

(a) Pulsed LI–IV curves of a 1.5-mm-long, -wide double-metal waveguide laser ridge with HR backfacet coating: a duty cycle of 0.01% has been chosen in order to avoid bolometer saturation; (b) CW–LI curves of a 0.75-mm-long, -wide double-metal waveguide laser ridge: emitted power has been measured with a calibrated thermopile. Inset: emission spectra in pulsed mode for the same device at different injection current densities at . The mode spacing suggests that the laser is operating on a high order lateral mode.

Image of FIG. 4.
FIG. 4.

Experimental temperature dependence of the threshold current density for sample N310 (bound-to-continuum design of Ref. 8) in a single-plasmon waveguide (disks), experimental temperature dependence for sample N314 in single-plasmon waveguide (triangles) and double metal waveguide (squares). Theoretical modeling of the threshold current temperature dependence (dashed curve) including thermally activated waveguide losses from free carrier absorption (dashed–dotted curve) and hot electrons effects (solid curve).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Terahertz bound-to-continuum quantum-cascade lasers based on optical-phonon scattering extraction