Tunable and switchable lasing in a ZnO microwire cavity at room temperature

Michalsky, Tom; Wille, Marcel; Grundmann, Marius; Schmidt‐Grund, Rüdiger

doi:10.1088/1361-6463/aaddda

Cited by 7 publications

(2 citation statements)

References 28 publications

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“…In plasmonic nanolasers, surface plasmons coupled with photons confine light to the deep subwavelength area at the metal–dielectric material interface, enhancing light–matter interactions and supporting lasing modes much smaller than the optical wavelength. − As a result, the dimension of the plasmonic cavity can be compressed to the nanometer scale, ultimately enabling the simultaneous amplification of photons. Various types of nanolasers have been demonstrated that possess many attributes for an on-chip light source such as low thresholds, ,− room-temperature operation, − and dense-integration capability. Widespread efforts have been made to control the energy confinement between a metal–dielectric interface in metal–oxide–semiconductor structures.…”

Section: Introductionmentioning

confidence: 99%

Superb Low Threshold Surface-Plasmon Polariton ZnO Nanolasers on an Aluminum Film with Tailored MoO₃ and Ta₂O₅ Dielectric Interlayers of Varied Thickness

et al. 2022

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Effects of high-k dielectric MoO 3 and Ta 2 O 5 interlayers on the lasing thresholds of ZnO/high-k material/Al nanolasers have been investigated. The results demonstrated the highdielectric-constant materials as the interlayers over the epitaxially grown aluminum (Al) film consisting of high-quality ZnO nanowires constructing superb low threshold surface-plasmon polariton lasers. High-quality ZnO nanowires grown via the chemical vapor deposition process were used as the gain media placed over a single-crystalline Al film deposited via molecular beam epitaxy. For high metallic losses in the Al film, high k-dielectric material films (MoO 3 and Ta 2 O 5 ), deposited using the electron beam technique, are inserted in the midst of the Al film and ZnO nanowires to reduce the material losses and enhance the optical confinement. It has been found that the lasing threshold varies with the increasing thickness and reduces while increasing the dielectric constant. The performances are compared with those of similarly fabricated nanolasers with Al 2 O 3 and WO 3 dielectric interlayers. The critical roles of dielectric constants of the dielectric interlayers in influencing the thresholds of lasing are elucidated. Highly suppressed losses in lasing can be attributed to the dielectric layer that manifests the strong energy confinement in the sub regime. It also shows that the correlation of the lasing threshold with the dielectric constant value applies mainly to the same laser system. For different systems, other factors such as the crystallinity and defects present should be taken into consideration.

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Section: Introductionmentioning

confidence: 99%

Superb Low Threshold Surface-Plasmon Polariton ZnO Nanolasers on an Aluminum Film with Tailored MoO₃ and Ta₂O₅ Dielectric Interlayers of Varied Thickness

et al. 2022

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“…In nanowires, the lasing modes are formed by light reflection between the wires end facets, so that the resonator length and thus the modes’ extent is typically in the order of 10 μm . While the light-matter interaction is usually already in the strong coupling regime when the wires are not entirely pumped, − the modes do not propagate but, due to the three-dimensional confinement, rather form standing waves. In microwires, typically lasing out of whispering gallery modes is observed, , whereby only a few reports explicitly discuss the coupling regime (e.g., refs − ).…”

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confidence: 99%

Spatiotemporal Evolution of Coherent Polariton Modes in ZnO Microwire Cavities at Room Temperature

et al. 2018

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Tunable waveguides for propagating coherent quantum states are demanded for future applications in quantum information technology and optical data processing. We present coherent whispering gallery mode polariton states in ZnO-based hexagonal microwires at room temperature. We observed their propagation over the field of view of about 20 μm by picosecond time-resolved real space imaging using a streak camera. Spatial coherence was proven by time integrated Michelson interferometry superimposing the inverted spatial emission pattern with its original one. We furthermore show that the real and momentum space evolution of the coherent states can not only be described by the commonly used model developed for ballistically propagating Bose–Einstein condensates based on the Gross–Pitaevskii equation but equivalently by classical ray optics considering a spatially varying particle density dependent refractive index of the cavity material, not yet considered in literature so far. By changing the excitation spot size, the refractive index gradient and thus the propagation velocity is changed.

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Coherent Polariton Modes and Lasing in ZnO Nano‐ and Microwires

Schmidt‐Grund

Michalsky

Wille

et al. 2019

Physica Status Solidi (b)

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This article presents a topical literature survey on types of coherent states in bare and functionalized ZnO nano‐ and microwire microcavities, together with own new approaches of the authors. By optical excitation, coherent emission from electron–hole plasma and from exciton‐polariton Bose–Einstein condensates, both up to room temperature, have been observed by various research groups. The impact of the interplay between the excitation properties and geometry of the structures as well as of the charge carrier dynamics on the emission behavior of the structures has been discussed. For different cavity types spectrally tunable mono‐/dual‐mode laser operation as well as propagation of coherent polariton states have been demonstrated. Further functionalization of the bare structures in hybrid systems allows optimization and engineering of the cavity as well as the polariton mode structure and the design of sophisticated light–matter states.

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Tunable and switchable lasing in a ZnO microwire cavity at room temperature

Cited by 7 publications

References 28 publications

Superb Low Threshold Surface-Plasmon Polariton ZnO Nanolasers on an Aluminum Film with Tailored MoO₃ and Ta₂O₅ Dielectric Interlayers of Varied Thickness

Superb Low Threshold Surface-Plasmon Polariton ZnO Nanolasers on an Aluminum Film with Tailored MoO₃ and Ta₂O₅ Dielectric Interlayers of Varied Thickness

Spatiotemporal Evolution of Coherent Polariton Modes in ZnO Microwire Cavities at Room Temperature

Coherent Polariton Modes and Lasing in ZnO Nano‐ and Microwires

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Tunable and switchable lasing in a ZnO microwire cavity at room temperature

Cited by 7 publications

References 28 publications

Superb Low Threshold Surface-Plasmon Polariton ZnO Nanolasers on an Aluminum Film with Tailored MoO3 and Ta2O5 Dielectric Interlayers of Varied Thickness

Superb Low Threshold Surface-Plasmon Polariton ZnO Nanolasers on an Aluminum Film with Tailored MoO3 and Ta2O5 Dielectric Interlayers of Varied Thickness

Spatiotemporal Evolution of Coherent Polariton Modes in ZnO Microwire Cavities at Room Temperature

Coherent Polariton Modes and Lasing in ZnO Nano‐ and Microwires

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Product

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Superb Low Threshold Surface-Plasmon Polariton ZnO Nanolasers on an Aluminum Film with Tailored MoO₃ and Ta₂O₅ Dielectric Interlayers of Varied Thickness

Superb Low Threshold Surface-Plasmon Polariton ZnO Nanolasers on an Aluminum Film with Tailored MoO₃ and Ta₂O₅ Dielectric Interlayers of Varied Thickness