Sub-picosecond electron dynamics in polycrystalline diamond films

Zukerstein, Martin; Trojánek, F.; Koutenský, Petr; Varga, M.; Kromka, Alexander; Kozák, Martin; Malý, Pavel

doi:10.1016/j.diamond.2020.107935

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…The practical application of all the above-listed positive properties of nanocrystalline diamond is limited due to the relatively high concentration of radiative and nonradiative defects in the layer. − The defects are located primarily on the surface of the grains where the diamond lattice is damaged and, second, in-between them where the sp 2 -related carbon phase is present. Both types of defects are responsible for optical losses caused by the absorption of light.…”

Section: Introductionmentioning

confidence: 99%

Strain-Relaxed Nanocrystalline Diamond Thin Films with Silicon Vacancy Centers Using Femtosecond Laser Irradiation for Photonic Applications

Ondič

Trojánek

Varga

et al. 2023

ACS Appl. Nano Mater.

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Nanocrystalline diamond thin (thickness of 100–500 nm) films with ensembles of negatively charged light-emitting silicon vacancy (SiV) centers might find an application in the field of photonics or biosensing due to their scalable and low-price fabrication process in comparison with monocrystalline diamond. The potential application of diamond thin films is, however, limited due to the presence of radiative and nonradiative defects. The former type is a source of an unwanted background in the photoluminescence spectra, the latter lowers the quantum efficiency of light emission, and both types of defects cause the reabsorption of SiV emission during its propagation within the layer. Here we show that femtosecond (fs) laser pulses focused via a microscope objective on a nanocrystalline diamond thin film can be employed to reduce background photoluminescence intensity by a factor of 5 with respect to the luminescence of SiV centers. Raman spectra show that this decrease is mainly caused by laser ablation of the sp2-related carbon phase present in-between the grains. The reduction of the sp2 carbon phase also leads to a local decrease in the optical absorption followed by an almost twofold increase in the SiV emission peak intensity. Moreover, the fs-irradiation also entails the release of strain inside such a layer as manifested by the observed shift of the Raman diamond peak toward the value measured in the monocrystalline diamond and by a blue-shift of the zero-phonon-line peak position of the SiV centers. Such a finding might enable the improvement of the optical quality of the nanocrystalline diamond-based photonic nanostructures or even might be employed over a larger area by defocusing the irradiation laser in order to create large-scale strain-relaxed nanocrystalline diamond thin films.

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Section: Introductionmentioning

confidence: 99%

Strain-Relaxed Nanocrystalline Diamond Thin Films with Silicon Vacancy Centers Using Femtosecond Laser Irradiation for Photonic Applications

Ondič

Trojánek

Varga

et al. 2023

ACS Appl. Nano Mater.

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Single-photon emission from silicon-vacancy color centers in polycrystalline diamond membranes

Flatae,

Sledz,

Kambalathmana

et al. 2024

Applied Physics Letters

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Single-color centers in thin polycrystalline diamond membranes allow the platform to be used in integrated quantum photonics, hybrid quantum systems, and other complex functional materials. While single-crystal diamond membranes are still technologically challenging to fabricate as they cannot be grown on a non-diamond substrate, free-standing polycrystalline diamond membranes can be conveniently fabricated at large-scale from nanocrystalline diamond seeds on a substrate that can be selectively etched. However, their practical application for quantum photonics is so far limited by crystallographic defects, impurities, graphitic grain boundaries, small grain sizes, scattering loss, and strain. In this paper, we report on a single-photon source based on silicon-vacancy color centers in a polycrystalline diamond membrane. We discuss the spectroscopic approach and quantify the photon statistics, obtaining a g2(0) ≈ 0.04. Our findings hold promise for introducing polycrystalline diamond to quantum photonics and hybrid quantum systems.

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Sub-picosecond electron dynamics in polycrystalline diamond films

Cited by 2 publications

References 34 publications

Strain-Relaxed Nanocrystalline Diamond Thin Films with Silicon Vacancy Centers Using Femtosecond Laser Irradiation for Photonic Applications

Strain-Relaxed Nanocrystalline Diamond Thin Films with Silicon Vacancy Centers Using Femtosecond Laser Irradiation for Photonic Applications

Single-photon emission from silicon-vacancy color centers in polycrystalline diamond membranes

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