Observation of whispering gallery modes from hexagonal ZnO microdisks using cathodoluminescence spectroscopy

Choi, Sumin; Phillips, M. R.; Aharonovich, Igor

doi:10.1063/1.4826481

Cited by 21 publications

(15 citation statements)

References 31 publications

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“…In addition, ZnO is very suitable for photonic applications, as it has a wide, direct bandgap (3.4 eV) and a large number of intrinsic defects and impurities that emit from the ultraviolet to the near infrared 14,15 . Finally, photonic elements including microdisk cavities 11,16,17 can be easily fabricated from this material. Therefore, there is an urgency to understand and…”

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confidence: 99%

Single photon emission from ZnO nanoparticles

Choi

Johnson²,

Castelletto³

et al. 2014

Applied Physics Letters

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Room temperature single photon emitters are very important resources for photonics and emerging quantum technologies. In this work we study single photon emission from defect centers in 20 nm zinc oxide (ZnO) nanoparticles. The emitters exhibit bright broadband fluorescence in the red spectral range centered at 640 nm with polarized excitation and emission. The studied emitters showed continuous blinking, however, bleaching can be suppressed using a polymethyl methacrylate (PMMA) coating. Furthermore, hydrogen termination increased the density of single photon emitters. Our results will contribute to the identification of quantum systems in ZnO.Sources of non-classical light, are important for a range of applications in quantum communications, sensing and information processing 1, 2 . A particular emphasis is placed on the development of solid-state single photon sources that operate at room temperature, as those are the most promising sources for scalable and integrated devices. Color centers in diamond 3 , and in particular the nitrogen vacancy 4 and the silicon vacancy defects 5,6 , have been the subject of intense study in recent years due to their unprecedented photostability and spin properties. Recently, several additional materials have emerged as candidates for single photon generation, including site controlled GaN quantum dots 7 , defects in silicon carbide 8 and zinc oxide (ZnO) 9 . While the single photon emission in SiC is attributed to the intrinsic defect known as an "antisite -vacancy pair", the origin of the quantum emission in ZnO remains under debate. ZnO offers an interesting and valuable system to study quantum effects at the nanoscale 10 . ZnO nanoparticles are commercially available while nanowires and other nanostructures can be easily synthesized by hydrothermal 11 or chemical vapour deposition growth techniques 12,13 . In addition, ZnO is very suitable for photonic applications, as it has a wide, direct bandgap (3.4 eV) and a large number of intrinsic defects and impurities that emit from the ultraviolet to the near infrared 14,15 . Finally, photonic elements including microdisk cavities 11,16,17 can be easily fabricated from this material. Therefore, there is an urgency to understand and

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confidence: 99%

Single photon emission from ZnO nanoparticles

Choi

Johnson²,

Castelletto³

et al. 2014

Applied Physics Letters

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“…Some of local polarizationdependent experiments show that the WGMs are preferentially TM polarized, since detecting TE polarization causes an almost complete suppression of WGMs modulations. However, other works investigated that the WGMs observed from the ZnO microdisks were mostly TE polarized [85,87]. Figure 6D shows the dependence of the WGMs on the size of the ZnO wires.…”

Section: Wgms From Zno Nanostructuresmentioning

confidence: 99%

“…where R is the radius of outer circle of the resonator, N is the resonance interference order, β = n −1 for TM polarization and β = n for TE polarization [85,86]. Figure 6A shows a spatially resolved cathodoluminescence (CL) spectrum from an individual ZnO nanonail head with a side length of 794 nm.…”

Section: Wgms From Zno Nanostructuresmentioning

confidence: 99%

Zinc Oxide Nanophotonics

Choi

Aharonovich

2015

Nanophotonics

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Abstract:The emerging field of nanophotonics initiated a dedicated study of single photon sources and optical resonators in new class of materials. One such material is zinc oxide (ZnO) that has been long considered only for classical light-emitting applications. However, it recently showed promise for quantum photonics technologies. In this review, we highlight the recent advances in studying single emitters in ZnO, engineering of optical cavities and practical nanophotonics devices including nanolasers and electrically triggered devices. We finalize with an outlook at this promising area, as well as provide perspectives and open questions in solid state nanophotonics employing ZnO.

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“…Most demonstrations of WGM cathodoluminescence images have been demonstrated with wide band gap materials such as GaN [12] and ZnO [13] while recourse to HCL remains anecdotal [5]. Conversely, recent results using scanning near-field microscopy on InP-based microdisks [14] demonstrate the vivid interest in imaging WGMs at the sub-wavelength resolution.…”

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confidence: 99%