dc.contributor.author | Fasching, Gernot | |
dc.contributor.author | Tamošiūnas, Vincas | |
dc.contributor.author | Benz, Alexander | |
dc.contributor.author | Andrews, Aaron Maxwell | |
dc.contributor.author | Unterrainer, Karl | |
dc.contributor.author | Zobl, Reinhard | |
dc.contributor.author | Roch, Tomas | |
dc.contributor.author | Schrenk, Werner | |
dc.contributor.author | Strasser, Gottfried | |
dc.date.accessioned | 2023-09-18T19:57:47Z | |
dc.date.available | 2023-09-18T19:57:47Z | |
dc.date.issued | 2007 | |
dc.identifier.issn | 0018-9197 | |
dc.identifier.other | (BIS)VGT02-000015802 | |
dc.identifier.uri | https://etalpykla.vilniustech.lt/handle/123456789/145097 | |
dc.description.abstract | We report on the emission characteristics of microcavity quantum-cascade lasers emitting in the terahertz frequency range based on circular-shaped microresonators. Strong mode confinement in the growth and in-plane directions are provided by a double-plasmon waveguide and due to the strong impedance mismatch between the gain material and air. This allows laser emission from devices with overall dimensions much smaller than the free-air emission wavelength ( 100 m). Hence, for the smallest microdisks we achieved a threshold current as low as 13.5 mA (350 A/cm2) in pulsed-mode operation at 5 K and stable single-mode emission up to 95 K in continuous-wave mode operation. We have observed dynamical frequency pulling of the resonator mode on the gigahertz scale, as a consequence of the gain shift due to the quantum-confined Stark effect. Thus, we were able to estimate the peak gain of the material to 27 cm 1. The smallest microcavities exhibited a strong dependence on the exact placement of the bond wire which resulted in single- as well as double-mode emission. Finite-difference time-domain simulations were performed in order to identify the modes of the recorded spectra. They confirm that most of the observed spectral features can be attributed to the lasing emission of whispering-gallery modes. | eng |
dc.format | PDF | |
dc.format.extent | p. 687-697 | |
dc.format.medium | tekstas / txt | |
dc.language.iso | eng | |
dc.relation.isreferencedby | Science Citation Index Expanded (Web of Science) | |
dc.relation.isreferencedby | IEEE Xplore | |
dc.source.uri | http://dx.doi.org/doi:10.1109/JQE.2007.900254 | |
dc.title | Subwavelength microdisk and microring terahertz quantum-cascade lasers | |
dc.type | Straipsnis Web of Science DB / Article in Web of Science DB | |
dcterms.references | 48 | |
dc.type.pubtype | S1 - Straipsnis Web of Science DB / Web of Science DB article | |
dc.contributor.institution | Viena University of Technology | |
dc.contributor.institution | Vilniaus Gedimino technikos universitetas Puslaidininkių fizikos institutas | |
dc.contributor.faculty | Fundamentinių mokslų fakultetas / Faculty of Fundamental Sciences | |
dc.subject.researchfield | T 001 - Elektros ir elektronikos inžinerija / Electrical and electronic engineering | |
dc.subject.lt | Lazeriai | |
dc.subject.lt | Mikrorezonatoriai | |
dc.subject.lt | Kvantiniai-kaskadiniai | |
dc.subject.lt | Dalinės bangos ilgis | |
dc.subject.lt | Terahercai | |
dc.subject.en | Laser | |
dc.subject.en | Microcavity | |
dc.subject.en | Quantum-cascade | |
dc.subject.en | Subwavelength | |
dc.subject.en | Terahertz | |
dcterms.sourcetitle | Journal of quantum electronics | |
dc.description.issue | No. 12 | |
dc.description.volume | Vol. 43 | |
dc.publisher.name | IET | |
dc.publisher.city | Stevenage | |
dc.identifier.doi | LBT02-000026494 | |
dc.identifier.doi | 000248562700021 | |
dc.identifier.doi | 10.1109/JQE.2007.900254 | |
dc.identifier.elaba | 3802777 | |