Dielectric properties of nitrogen-doped polycrystalline diamond films in Ka band

Liu, Y.; Ding, Minghui; Su, Jingtan; Li, Y.; Zhang, P.; Lu, Xuegang; Tang, Wenbo

doi:10.1016/j.diamond.2017.04.009

Cited by 15 publications

(16 citation statements)

References 30 publications

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“…The value of the imaginary part of permittivity was close to zero. The results were similar with those reported in the literature [17,18,19,20]. For sample B where the GFs were vertical to the incident electric field, both the real and imaginary parts of permittivity slightly increased along with the loss tangent, as shown in Figure 6.…”

Section: Resultssupporting

confidence: 90%

“…The presence of this peak indicates that a small number of nitrogen atoms were added to the chamber of MPCVD system. On one hand, the incorporation of nitrogen impurities reduce the quality of diamond films [17,19,20]. On the other hand, the impurities facilitate the absorption of laser energy when the photon energy of laser is lower than the band gap of diamond and contribute to the graphitization of diamond [31].…”

Section: Resultsmentioning

confidence: 99%

“…Except for the granular diamond materials used for sintering, diamond films have been reported as a bulk diamond material produced by microwave plasma chemical vapor deposition (MPCVD). However, in general, the loss tangent of pure diamond films is only in the range of 10 −3 –10 −5 [17,18,19,20]. That means pure diamond films are a microwave transparent material, usually used in high-power microwave windows [21].…”

Section: Introductionmentioning

confidence: 99%

“…In our previous study [19,20,22], nitrogen- and boron-doped diamond films were prepared by MPCVD. It was found that the loss tangent of nitrogen-doped diamond films was close to the pure diamond films, i.e., after nitrogen doping, the diamond films are also a microwave transparent material [19,20]. This result was consistent with the previous study [17].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Laser Ablation on Microwave Attenuation Properties of Diamond Films

Ding

Liu

et al. 2019

Materials

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Thermal conductivity is required for developing high-power microwave technology. Diamond has the highest thermal conductivity in nature. In this study, a diamond film was synthesized by microwave plasma chemical deposition, and then long and short conductive graphite fibers were introduced to the diamond films by laser ablation. The permittivity of the samples in the K-band was measured using the transmission/reflection method. The permittivity of diamond films with short graphite fibers increased. The increase in real part of permittivity can be attributed to electron polarization, and the increase in the imaginary part can be ascribed to both polarization and electrical conductivity. The diamond films with long graphite fibers exhibited a highly pronounced anisotropy for microwave. The calculation of microwave absorption shows that reflection loss values exceeding −10 dB can be obtained in the frequency range of 21.3–23.5 GHz when the graphite fiber length is 0.7 mm and the sample thickness is 2.5 mm. Therefore, diamond films can be developed into a microwave attenuation material with extremely high thermal conductivity.

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Laser Ablation on Microwave Attenuation Properties of Diamond Films

Ding

Liu

et al. 2019

Materials

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“…Yamada, et al have presented the outstanding dielectric properties of polished clone mosaic SCD at 0.11–0.17 THz band and found that a rough surface and sp 2 phase, as well as cracks were the main causes of power loss of EMW. Liu and Garin , reported that defects and conduction caused by sp 2 phase are the reasons of dielectric loss at sub-MM wavelength, although the use of PCDs exhibited lowest loss performance. These factors of EMW attenuation have also been confirmed by Heidinger and Polyakov. , Meanwhile, the feasibilities of CVD diamond window prototype in the nuclear fusion system have been conducted. , Further, Yamamoto, et al carried out the evident dielectric loss of a CVD diamond film in the range up to 2.2 THz by THz time-domain spectroscopy (THz-TDS) and predictably suggested that some dielectric response might be presented, and defects (dark features) in the CVD diamond may introduce the THz response.…”

Section: Introductionmentioning

confidence: 99%

Doomed Couple of Diamond with Terahertz Frequency: Hyperfine Quality Discrimination and Complex Dielectric Responses of Diamond in the Terahertz Waveband

Zheng

Zhang

Chen

et al. 2020

ACS Appl. Electron. Mater.

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The technology age of terahertz (THz) frequency is coming, with tremendous features and astonishing applications in various fields of science. Using THz time domain spectroscopy, we demonstrate experimentally, for the first time, the fingerprint absorption peaks and the complex dielectric response trends in a 0.1–3 THz frequency waveband, on intentionally synthesized and processed chemical vapor deposition polycrystalline and single-crystal diamond films with systematic quality difference. The two absorption signatures within the 0.1–3 THz frequency band, in which the atomic vibration is material-independent, are attributed to the sp2 phonon vibration modes of as-grown graphitic phases and/or defects. Regarding the complex dielectric responses of diamond in the THz waveband, the scattering effect resulting from the extended grain boundaries associated with concomitant pores (even gaps) (and/or extended crystal cleavage faults associated with amorphous carbon), as well as intrinsic lattice absorption resulting from increased sp2 impurities, have been taken into account. Especially the defect size comparable with the wavelength is also found to have a significant effect on the loss at a higher-frequency electromagnetic wave. These findings are expected to promote not only ultra-sensitive quality diagnosis for diamond but also verification of an ideal transmission material for THz waveband applications.

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Manipulation of the In Situ Nitrogen‐Vacancy Doping Efficiency in CVD‐Grown Diamond

Langer

Cimalla

Lebedev

et al. 2022

Physica Status Solidi (a)

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Herein, the in situ generation of nitrogen‐vacancy (NV) centers in diamond during chemical vapor deposition (CVD) is investigated depending on the electric‐field strength at the sample position. The alteration of the electric‐field strength is induced by changing the resonance conditions within the resonator cavity while keeping the growth input variables constant. The electric‐field strength distribution is obtained by simulation results. During the growth experiments, optical‐emission spectroscopy data is collected, which shows the impact of the electric‐field strength on the radical concentrations within the plasma and the gas temperature. Through the reduction of the electric‐field strength, the synthesis of thick, high‐quality, nitrogen‐doped diamond without the formation of a polycrystalline rim around the sample edges and the twinning‐induced growth of polycrystalline grains was accomplished. Therefore, a reduced internal and more homogeneous stress distribution is achieved. Furthermore, significant influences on the in situ NV doping are discovered. In addition to a considerable gain of the in situ NV generation, also a major enhancement of the in situ incorporation efficiency of NV centers in comparison to centers up to almost 3% is observed. Depending on the application, this makes posttreatment processes for additional NV generation dispensable.

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Dielectric properties of nitrogen-doped polycrystalline diamond films in Ka band

Cited by 15 publications

References 30 publications

Effect of Laser Ablation on Microwave Attenuation Properties of Diamond Films

Effect of Laser Ablation on Microwave Attenuation Properties of Diamond Films

Doomed Couple of Diamond with Terahertz Frequency: Hyperfine Quality Discrimination and Complex Dielectric Responses of Diamond in the Terahertz Waveband

Manipulation of the In Situ Nitrogen‐Vacancy Doping Efficiency in CVD‐Grown Diamond

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