Cathodoluminescence hyperspectral analysis of whispering gallery modes in active semiconductor wedge resonators

Guillemé, Pierre; Stervinou, Julie; Rohel, Tony; Cornet, Charles; Gachet, D.; Balac, Stéphane; Mahé, Fabrice; Dumeige, Yannick; Léger, Yoan

doi:10.1364/ol.43.001766

Cited by 2 publications

(3 citation statements)

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“…The averaged value is close to the Q factors obtained in previous works on GaP/AlGaP/GaP microdisks fabricated using a similar technological process. [21] On Fig.2 c), one observes that the confidence interval gets narrower with increasing radius. This will be discussed in the following.…”

Section: Iii-v Semiconductors Grown On Silicon Recently Appeared As Amentioning

confidence: 85%

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Loss assessment in random crystal polarity gallium phosphide microdisks grown on silicon

et al. 2020

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III-V semiconductors grown on silicon recently appeared as a promising platform to decrease the cost of photonic components and circuits. For nonlinear optics, specific features of the III-V crystal arising from the growth on the nonpolar Si substrate and called antiphase domains (APDs) offer a unique way to engineer the second-order properties of the semiconductor compound. Here we demonstrate the fabrication of microdisk resonators at the interface between a gallium-phosphide layer and its silicon substrate. The analysis of the whispering gallery mode quality factors in the devices allows the quantitative assessment of losses induced by a controlled distribution of APDs in the GaP layer and demonstrates the relevance of such a platform for the development of polarity-engineered III-V nonlinear photonic devices on silicon.

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Section: Iii-v Semiconductors Grown On Silicon Recently Appeared As Amentioning

confidence: 85%

“…After mask removal with CF4 ICP-RIE, microdisks were partially released by underetching the Si with isotropic SF6 RIE which also bevels slightly the GaP rims. [21] The sample features a 2D-array of microdisks with increasing size. Their radii vary from 2 µm to 3.5 µm.…”

Section: Iii-v Semiconductors Grown On Silicon Recently Appeared As Amentioning

confidence: 99%

Loss assessment in random crystal polarity gallium phosphide microdisks grown on silicon

et al. 2020

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“…The gradual emission intensity weakening additionally supports the connection between structural strain in the SL and the optical changes at the edges of the SL. Additional CL characterization utilized two-dimensional hyperspectral (HYP) mapping; in which a full CL spectrum is obtained from every pixel of the map. − From the HYP CL data, we mapped the CL intensity and emission wavelength distributions in CsPbBr 3 SLs (Figure c,d). In both CL-HYP maps, several emissive domains within a single SL were identified.…”

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confidence: 99%

Tuning the Colloidal Softness of CsPbBr₃ Nanocrystals for Homogeneous Superlattices

et al. 2023

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Perovskite nanocrystal superlattices (NC SLs), made from millions of ordered crystals, support collective optoelectronic phenomena. Coupled NC emitters are highly sensitive to the structural and spectral inhomogeneities of the NC ensemble. Free electrons in scanning electron microscopy (SEM) are used to probe the cathodoluminescence (CL) properties of CsPbBr3 SLs with a ∼20 nm spatial resolution. Correlated CL-SEM measurements allow for simultaneous characterization of structural and spectral heterogeneities of the SLs. Hyperspectral CL mapping shows multipole emissive domains within a single SL. Consistently, the edges of the SLs are blue-shifted relative to the central domain by up to 65 meV. We discover a relation between NC building block colloidal softness and the extent of the CL shift. Residual uniaxial compressive strains accompanying SL formation are contributors to these emission shifts. Therefore, precise control over the colloidal softness of the NC building blocks is critical for SL engineering.

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Cathodoluminescence hyperspectral analysis of whispering gallery modes in active semiconductor wedge resonators

Abstract: , et al.. Cathodoluminescence hyperspectral analysis of whispering gallery modes in active semiconductor wedge resonators.

Cited by 2 publications

References 23 publications

Loss assessment in random crystal polarity gallium phosphide microdisks grown on silicon

Loss assessment in random crystal polarity gallium phosphide microdisks grown on silicon

Tuning the Colloidal Softness of CsPbBr₃ Nanocrystals for Homogeneous Superlattices

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Cathodoluminescence hyperspectral analysis of whispering gallery modes in active semiconductor wedge resonators

Abstract: , et al.. Cathodoluminescence hyperspectral analysis of whispering gallery modes in active semiconductor wedge resonators.

Cited by 2 publications

References 23 publications

Loss assessment in random crystal polarity gallium phosphide microdisks grown on silicon

Loss assessment in random crystal polarity gallium phosphide microdisks grown on silicon

Tuning the Colloidal Softness of CsPbBr3 Nanocrystals for Homogeneous Superlattices

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Tuning the Colloidal Softness of CsPbBr₃ Nanocrystals for Homogeneous Superlattices