2020
DOI: 10.1049/el.2020.1963
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Abstract: A broadband active metasurface is designed around quantum-cascade (QC) gain material for use in a broadband tunable QC vertical external-cavity surface-emitting laser (VECSEL). The metasurface is based on a unit cell containing two resonant waveguide elements that couple with the periodicity of the metasurface to produce a multiresonant reflection spectrum. Simulated reflectance spectra exhibit full-width half-maximum bandwidths up to 50% of the centre frequency. The tested QC-VECSEL demonstrates up to 15 mW o… Show more

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Cited by 7 publications
(4 citation statements)
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“…However, at such small cavity lengths, the presence of higher-order transverse modes caused worse beam patterns and occasional multimoding throughout the tuning range. Still, it suggested that the particular active material had up to ∼1 THz gain bandwidth [45]. The device also showed consistent tuning performance during cw operation.…”
Section: Experimental Survey Of Tunable Qc-vecselsmentioning
confidence: 85%
“…However, at such small cavity lengths, the presence of higher-order transverse modes caused worse beam patterns and occasional multimoding throughout the tuning range. Still, it suggested that the particular active material had up to ∼1 THz gain bandwidth [45]. The device also showed consistent tuning performance during cw operation.…”
Section: Experimental Survey Of Tunable Qc-vecselsmentioning
confidence: 85%
“…16 , and nominally identical to that in Ref. 15 . Microfabrication of the QC metasurface takes place in the standard metal-metal waveguide process, using a Cu-Cu thermocompression wafer bonding technique.…”
mentioning
confidence: 83%
“…12 , or even an ultrabroadband coupled-resonator metasurface as in Ref. 15 , which has exhibited a gain bandwidth over 1 THz and reduced group delay dispersion. Moreover, the engineered inhomogeneity present in the coupled-resonator metasurface may exhibit an increased degree of spatial hole burning in that different portions of the spectral profile are localized in different portions of the metasurface and is therefore favorable for multi-mode operation in QC-VECSELs.…”
Section: Please Cite This Article Asmentioning
confidence: 99%
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