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Surface-emitting photonic crystal terahertz quantum cascade lasers
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View: Figures


Image of FIG. 1.
FIG. 1.

Light-current-voltage measurement from a SEPhC with a lattice constant of and , operated in pulsed mode at 10 K. Light from the surface of the device was measured with a Golay cell and peak power was calibrated with an absolute terahertz power meter. Inset: A mounted SEPhC device.

Image of FIG. 2.
FIG. 2.

Laser spectra recorded at peak terahertz output power in cw operation, for a range of device lattice constants. Dashed lines follow two spectral features which tune linearly with lattice constant. Lower inset: Simulation showing multiple regions with low (highlighted bands) in the photonic crystal band structure. Circled regions correspond to the two principal emission peaks in the figure. Upper inset: Brillouin zone of the reciprocal lattice.

Image of FIG. 3.
FIG. 3.

Far-field terahertz emission beam patterns. Orientations of each beam cross section are illustrated in (a) and (b); colors correspond to data below. Patterns were recorded while sweeping the detector over a ridge waveguide, from facet to facet, shown in (c), and from edge to edge and corner to corner of SEPhC mesas, shown in (d) and (e), respectively.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Surface-emitting photonic crystal terahertz quantum cascade lasers