Optical properties and microstructure of CVD diamond films

Yin, Zhipeng; Akkerman, Z. L.; Ye, Bo; Smith, F. W.

doi:10.1016/s0925-9635(96)00740-6

Cited by 40 publications

(16 citation statements)

References 8 publications

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“…The formation of this so-called high-spatial-frequency LIPSS (HSFL) has been observed for several materials and has been interpreted according to various mechanisms, such as second harmonic generation or self-organization. According to [19], we relate the ripple periodicity to the excitation of surface plasmon polaritons during the interaction between laser pulse and laser-induced plasma that generates ripples with a periodicity k r close to the value of k/2n, where k is the wavelength of the incident radiation and n the refractive index of CVD diamond, whose value at 800 nm is *2.4 [20]. In good agreement with this value, average n for TM180 has been calculated from optical characterization data to be 2.4105 at 800 nm, so that the average ripple period is *167 nm.…”

Section: Discussionmentioning

confidence: 99%

Optical properties of femtosecond laser-treated diamond

et al. 2014

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A laser-induced periodic surface structure (LIPSS) has been fabricated on polycrystalline diamond by an ultrashort Ti:Sapphire pulsed laser source (k = 800 nm, P = 3 mJ, 100 fs) in a high vacuum chamber (\10 -7 mbar) in order to increase diamond absorption in the visible and infrared wavelength ranges. A horizontally polarized laser beam had been focussed perpendicularly to the diamond surface and diamond target had been moved by an automated X-Y translational stage along the two directions orthogonal to the optical axis. Scanning electron microscopy of samples reveals an LIPSS with a ripple period of about 170 nm, shorter than the laser wavelength. Raman spectra of processed sample do not point out any evident sp 2 content, and diamond peak presents a right shift, indicating a compressive stress. The investigation of optical properties of fs-laser surface textured diamond is reported. Spectral photometry in the range 200/2,000 nm wavelength shows a significant increase of visible and infrared absorption (more than 80 %) compared to untreated specimens (less than 40 %). The analysis of optical characterization data highlights a close relationship between fabricated LIPSS and absorption properties, confirming the optical effectiveness of such a treatment as a light-trapping structure for diamond: these properties, reported for the first time, open the path for new applications of CVD diamond.

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Section: Discussionmentioning

confidence: 99%

Optical properties of femtosecond laser-treated diamond

et al. 2014

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“…For the wavelengths of 1040 nm, the material properties are taken into account by using the refractive index = + n i 2.4 0.0032. It is worth mentioning that we use here average values of refractive index and extinction coefficient typical for CVD diamond [27]. The beam is considered as a planar wave.…”

Section: Discussionmentioning

confidence: 99%

Field emission microscopy pattern of a single-crystal diamond needle under ultrafast laser illumination

et al. 2019

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We report herein on the spatial beam properties of a field emission electron source based on a singlecrystal diamond needle illuminated by ultrashort light pulses. We show that the increasing of the laser intensity strongly modifies the emission pattern, leading to the emergence of a new emission region at high peak power. This region is situated on the opposite side of the diamond needle to the one irradiated by the laser. By spatially-resolved energy spectrometry, we prove that the electrons emitted from this region are governed by a multi-photon absorption process. The occurrence of this emission pattern can be explained by accounting for the inhomogeneous distribution of the optical field enhancement and the laser absorption induced by light diffraction within the nanometric needle. The numerical simulations performed on a real sub-wavelength tip confirm this localization of the optical field enhancement and reveal that the electrons trajectories match the spatial beam distribution evidenced experimentally. This work underlines the need to closely monitor the surface roughness of the field emitter as well as the laser illumination conditions to finely control its emission pattern.

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“…For instance, in ocean remote sensing, it is used in the Ament model [5,6,16,17] to calculate the grazing incidence forward (i.e., in the specular direction) radar propagation over sea surfaces, in optics to determine optical constants of films [7,8] and other applications [9][10][11][12][13][14][15], or in indoor propagation, in ray-tracing based wave propagation models that take the wall roughness into account by introducing a power attenuation parameter [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Degree of Roughness of Rough Layers: Extensions of the Rayleigh Roughness Criterion and Some Applications

Pinel

Bourlier

Saillard

2010

PIER B

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Abstract-In the domain of electromagnetic wave propagation in the presence of rough surfaces, the Rayleigh roughness criterion is a widelyused means to estimate the degree of roughness of considered surface. In this paper, this Rayleigh roughness criterion is extended to the case of rough layers. Thus, it provides an interesting qualitative tool for estimating the degree of electromagnetic roughness of rough layers.

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Optical properties and microstructure of CVD diamond films

Cited by 40 publications

References 8 publications

Optical properties of femtosecond laser-treated diamond

Optical properties of femtosecond laser-treated diamond

Field emission microscopy pattern of a single-crystal diamond needle under ultrafast laser illumination

Degree of Roughness of Rough Layers: Extensions of the Rayleigh Roughness Criterion and Some Applications

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