Algorithm of Micro-Grooving and Imaging Processing for the Generation of High-Resolution Structural Color Images

Zhou, Tianfeng; He, Yupeng; Wang, Tianxing; Dong, Xiaobin; Liu, Peng; Zhao, Wenxiang; Hu, Yao; Yan, Jiwang

doi:10.1007/s41871-020-00068-1

Cited by 15 publications

(2 citation statements)

References 26 publications

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“…Channel length was also fixed at 14 mm (Table 2). Therefore, testing this range of widths assesses the feasibility of modern manufacturing methods and their suitability to these devices within this operating window [28][29][30][31].…”

Section: Variation In Channel Widthmentioning

confidence: 99%

Numerical Analysis of Microchannels Designed for Heat Sinks

McCormack

Zhang

2021

Nanomanuf Metrol

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Conjugate heat transfer is numerically investigated using a three-dimensional computational fluid dynamics approach in various microchannel geometries to identify a high-performance cooling method for piezoelectric ceramic stacks and spindle units in high-precision machines. Straight microchannels with rectangular cross sections are first considered, showing the performance limitations of decreasing the size of the microchannels, so other solutions are needed for high applied heat fluxes. Next, many microchannel designs, focusing on streamwise geometric variation, are compared to straight channels to assess their performances. Sinusoidally varying channels produce the highest heat transfer rates of those studied. Thus, their optimization is considered at a channel width and height of 35 and 100 μm, respectively. Heat transfer increases as the amplitude and spatial frequencies of the channels increase due to increased interfacial surface area and enhanced Dean flow. The highest performance efficiencies are observed at intermediate levels of amplitude and frequency, with efficiency decreasing as these geometric parameters are increased further at the onset of flow separation. The sinusoidal channel geometries are then optimized with respect to minimizing the system’s pressure drop for all applied heat fluxes between 5690 and 6510 kW/m2. Doing so created an optimal geometry curve and showed that all geometries in this region had amplitudes close to 40 μm. Therefore, imposing a fixed heat flux requirement for a case study of cooling piezoelectric ceramics, the optimized sinusoidal geometry decreases the system pressure drop by 79% relative to a straight channel while maintaining a larger minimum feature size.

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Section: Variation In Channel Widthmentioning

confidence: 99%

Numerical Analysis of Microchannels Designed for Heat Sinks

McCormack

Zhang

2021

Nanomanuf Metrol

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“…These devices can be tuned for their use in different fields based on their topographic parameters, such as the duty cycle or the asymmetric tilt angle of the grooves, known as the blaze angle. Some applications of this technology include light trapping [ 6 , 7 ], X-ray reflecting gratings [ 8 , 9 ], spectrometry [ 10 , 11 ], and image projection [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Single-Step Fabrication of Highly Tunable Blazed Gratings Using Triangular-Shaped Femtosecond Laser Pulses

Fantova,

Rodríguez,

Omeñaca

et al. 2024

Micromachines

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Blazed gratings are periodic surface structures of great interest for applications such as friction control, light trapping, and spectrometry. While different laser processing methods have been explored to produce these elements, they have not yet surpassed conventional surface manufacturing techniques, often based on lithography processes or mechanical ruling. This work introduces a new approach based on the combination of ultrashort pulses and triangular beam shaping, which enables the generation of asymmetrical grooves in a single step. The main advantage of this strategy is that by simply changing the laser processing direction we can induce a significant modification in the ratio of asymmetry between the sidewall angles of the machined channels. The paper includes a comprehensive study, which has been supported by statistical tools, of the effect of this and other experimental parameters on the morphology of grooves machined on stainless steel. As a result, we achieved a wide range of geometries, with asymmetry ratios spanning from 1 to 5 and channel depths between 3 and 15 µm. Furthermore, we demonstrate the validity of the approach through the successful manufacture of blazed gratings of various slopes. The results reflect the versatility and cost-efficiency of the proposed fabrication strategy, and thus its potential to streamline the production of sawtooth gratings and other devices that are based on asymmetrical features.

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