Optical properties of ZnO-based quantum structures

Makino, T.

doi:10.1016/j.spmi.2005.08.002

Cited by 7 publications

(2 citation statements)

References 43 publications

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“…However, ZnO, while also emitting in the UV range, has an even larger exciton binding energy, ranging from 60 meV for bulk ZnO to about 110 meV for ZnO/(Zn,Mg)O quantum wells, which allows for high-efficiency light emission by improved exciton–photon coupling and the possibility of achieving strong carrier localization, even at room temperature. − Moreover, ZnO exhibits pronounced nonlinear properties, which makes ZnO-based devices even more applicable not only for room-temperature UV lasers and single-photon sources but also for polariton lasers. − In addition to that, an efficient multiphoton absorption enables compatibility for integrated circuits with well-developed IR light sources. Besides high availability, the low-energy photons of IR light sources, in contrast to UV, are less likely to be absorbed and thus allow for a variety of materials within a photonic circuit.…”

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confidence: 99%

Tailored UV Emission by Nonlinear IR Excitation from ZnO Photonic Crystal Nanocavities

et al. 2018

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For many applications in photonics, e.g., free-space telecommunication, efficient UV sources are needed. However, optical excitation of such sources requires photons of even higher energies, which are difficult to integrate into photonic circuits. Here, we present photonic crystal devices based on zinc oxide (ZnO) that allow excitation using highly abundant sources in the near-infrared (NIR). These devices offer control of generating tailored photonic modes in the UV range via higher order nonlinear processes by combining the wide electronic band gap and pronounced nonlinear effects in ZnO with the adjustable properties of photonic crystal (PhC) membranes. Two different techniques for fabricating such ZnO-based PhC membranes are discussed, including the presentation of a novel bottom-up approach. Furthermore, dispersive theoretical simulations are introduced to determine the size and position of the photonic band gap, leading to an optimized cavity with only one dominant mode. This is followed by an evaluation of dominant loss channels, comparing cavities for both fabrication techniques, where we implemented a semianalytical model to determine scattering losses at imperfections of the PhCs. Additionally, energetic fine-tuning of such a mode as well as for other photonic modes that are formed by different cavity types is demonstrated. Ultimately, we validate that both linear one-photon and nonlinear three-photon excitation is possible with the presented devices, which renders them potential candidates for efficient UV light emitters that are powered by IR or NIR light sources.

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Tailored UV Emission by Nonlinear IR Excitation from ZnO Photonic Crystal Nanocavities

et al. 2018

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“…However, many of the material parameters for MgO are not well known, so we assumed the parameters to be equal to those of ZnO as a first approximation in the case of a lack of available data, so in the MgO hole, electron masses have been assumed to be the same as for ZnO. We propose that the Mg composition in the Zn 1−x Mg x O barrier is relatively small (x = 0.2) [46]. The formation of a heterojunction between ZnO and Zn 1−x Mg x O has been reported to be a type I heterojunction with a conduction band offset ΔE c = 314.19 meV and a valence band offset ΔE v = 34.91 meV [47,48].…”

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confidence: 99%

ZnO/ZnMgO: cubic quantum well laser in UV spectrum

Riane¹,

Mokaddem

Temimi

et al. 2016

Int J Adv Manuf Technol

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A theoretical study of the optical gain and the linewidth enhancement factor (α-parameter) in cubic ZnO/ ZnMgO quantum well laser is presented. The laser is designed to operate at ultraviolet (UV) spectrum at room temperature. This study is based on the density matrix theory including the Lorentzian broadening, with intraband relaxation taken into account. The investigation of the evolution of the optical gain and the line-width enhancement factor parameter as a function of carrier's densities and for different values of quantum well width is proposed. It is found that the cubic ZnO/ZnMgO quantum well laser is an efficient structure emitting in UV region spectrum.

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