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Efficient terahertz room-temperature photonic crystal nanocavity laser
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10.1063/1.2770767
/content/aip/journal/apl/91/7/10.1063/1.2770767
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/7/10.1063/1.2770767
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Coupled cavity photonic crystal laser. (a) Scanning electron micrograph of laser structure: array of single-defect cavities. Periodicity , hole radius , and thickness . (b) Lasing mode pumped at low power (, pulsed, pump laser diameter ).

Image of FIG. 2.
FIG. 2.

(Color online) LL curves. (a) Low-temperature lasing with pulsed excitation (, repetition) shows an averaged threshold of , corresponding to peak power. (b) At room temperature, lasing threshold increases to an averaged ( peak). (c) Continuous-wave lasing at low temperature shows a very low threshold of . Pump powers are measured before the objective lens.

Image of FIG. 3.
FIG. 3.

(Color online) Photonic crystal laser time response. (a) At low temperature (blue curve), at two times above lasing threshold. At room-temperature (green), time response follows that of the pump laser with . Inset: calculated response to a shorter, excitation pulse shows FWMH near when pumped two times above threshold; response is faster if we assume faster carrier relaxation time . (b) Illustration of pump inefficiency in pulsed operation. Pump energy is efficiently channeled into the cavity mode only during lasing (shaded area under curve, amplified here five times visibility); much of the remaining pump energy is wasted to SE and NR losses. (c) Time-resolved PL from unpatterned QW at RT. Faster response is possible through faster relaxation into the lasing level, estimated at from fitting to the rate model.

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/content/aip/journal/apl/91/7/10.1063/1.2770767
2007-08-17
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Efficient terahertz room-temperature photonic crystal nanocavity laser
http://aip.metastore.ingenta.com/content/aip/journal/apl/91/7/10.1063/1.2770767
10.1063/1.2770767
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