Laser ablation and structuring of CdZnTe with femtosecond laser pulses

Nivas, Jijil Jj; Allahyari, Elaheh; Vecchione, A.; Hao, Quan; Amoruso, Salvatore; Wang, X.

doi:10.1016/j.jmst.2020.01.059

Cited by 9 publications

(2 citation statements)

References 45 publications

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“…d o−a (focused laser beam diameter) and E th−sa (minimum laser energy to ablate the surface) were calculated using Eq. 10 [9,34,41,56,73] th−sa decreases with the reduction of the surface roughness as can be observed in Fig. 6.c.…”

Section: Topographysupporting

confidence: 57%

Effect of Surface Roughness on the Surface Texturing of 316 l Stainless Steel by Nanosecond Pulsed Laser

Al-Mahdy

Kotadia

Sharp

et al. 2022

Lasers Manuf. Mater. Process.

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Stainless steel 316L is an austenitic alloy that is widely used in varying industries due to its outstanding corrosion resistance, high strength, and ductility properties. However, the wear and friction resistance properties are low. Laser surface texturing can improve the wear and friction resistance of the material via the functionalisation of the surface. The laser surface texturing efficiency and the texture quality are defined by the material’s surface properties and laser parameters. The surface roughness is an important material property having an effect on laser surface texturing. This paper reports on a study of the material’s surface roughness influence on the texturing of 316L stainless steel with 1064 nm nanosecond pulsed laser. Single pulse shots were employed to avoid the topographic influence of the previous laser shots. The surface shape and the topography of the textures were assessed using optical microscopy and profilometry. It was observed that the textures produced were dimples of U-type and sombrero-like type geometries depending on surface roughness and pulse energy. The overall quality of the texture shape was better for smoother surfaces. The energy fluence necessary to generate textures is lower on surfaces of lower roughness than surfaces with high roughness. The surface at 24 nm of average roughness is the best surface for creating deep textures. The ablation mechanisms associated with high pulse energy, including plasma shielding, are produced at lower pulse energies for the 100 nm roughness, compared with other roughness samples.

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Section: Topographysupporting

confidence: 57%

Effect of Surface Roughness on the Surface Texturing of 316 l Stainless Steel by Nanosecond Pulsed Laser

Al-Mahdy

Kotadia

Sharp

et al. 2022

Lasers Manuf. Mater. Process.

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“…Cd x Zn 1 − x Te is useful for various optoelectronic applications such as visible detectors (1.45~2.26 eV) [ 1 , 2 ], solar cells [ 3 ], X-ray, and gamma-ray detectors [ 4 ], where the band gap can be tailored by changing the concentration of Zn content. In particular, Cd x Zn 1 − x Te quantum dots (QDs) have been extensively investigated; the interband transition energy was adjusted effectively by varying the growth conditions [ 5 ], and the QD size was controlled by changing Cd content as well as deposited layer thickness [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

Optical Gain of Vertically Coupled Cd0.6Zn0.4Te/ZnTe Quantum Dots

Mei

Kim

et al. 2023

Nanomaterials

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The optical modal gain of Cd0.6Zn0.4Te/ZnTe double quantum dots was measured using a variable stripe length method, where large and small quantum dots are separated with a ZnTe layer. With a large (~18 nm) separation layer thickness of ZnTe, two gain spectra were observed, which correspond to the confined exciton levels of the large and small quantum dots, respectively. With a small (~6 nm) separation layer thickness of ZnTe, a merged single gain spectrum was observed. This can be attributed to a coupled state between large and small quantum dots. Because the density of large quantum dots (4 × 1010 cm−2) is twice the density of small quantum dots (2 × 1010 cm−2), the density of the coupled quantum dots is determined by that of small quantum dots. As a result, we found that the peak gain (123.9 ± 9.2 cm−1) with the 6 nm separation layer is comparable to that (125.2 ± 29.2 cm−1) of the small quantum dots with the 18 nm separation layer.

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