Laser processing of micro/nano biomimetic structures

Xiao, Guijian; He, Yan; Liu, Shuai; Yi, Hao; Du, Lingyan

doi:10.1049/mna2.12055

Cited by 7 publications

(8 citation statements)

References 62 publications

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“…In [32], increasing the angle of incidence from 0 • to 60 • generated LIPSS with spatial periods in the range of ~214 nm to ~613 nm on 50 µm thick PET foils. The values measured were in accordance with Equation (1). A similar experiment with 50 µm thick PET foils was performed using a xenon chloride (XeCl) excimer laser with a wavelength λ of 308 nm [31].…”

Section: Introductionsupporting

confidence: 59%

“…Nature makes abundant use of highly versatile nano-and microscale surface features [1][2][3] for antiadhesion [4,5], wetting [6,7], directional liquid transport [8,9], and structural color [10,11]. All these surface properties are strongly influenced by the specific designs of the corresponding structures.…”

Section: Introductionmentioning

confidence: 99%

“…Using s-polarization (also called σ-polarization), the spatial period Λ of LIPSS is given by Λ = λ/(n eff − sin θ), (1) and, thus, depends on the angle of incidence θ of the laser light, the wavelength of the laser light, and the effective refractive index n eff [19,26,31]. The lower and upper limits of n eff are, respectively, the refractive indices of air and of the base material.…”

Section: Introductionmentioning

confidence: 99%

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Nanoscale Dots, Grids, Ripples, and Hierarchical Structures on PET by UV Laser Processing

Buchberger,

Kührer,

Hesser

et al. 2024

Photonics

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Nanostructures can be produced on poly(ethylene terephthalate) (PET) foils by using a krypton fluoride (KrF) excimer laser with a wavelength of 248 nm and a pulse duration of about 20 ns. We show that surface nanoripples, nanodots, nanogrids, and hybrid patterns of ripples with dots or finer ripples on top can be fabricated. The effects of a water layer in front of the PET foil and of cooling during laser processing were investigated. For pattern formation, several irradiation parameters (pulse number, pulse energy, and polarization) were varied systematically. The spatial periods of the ripples were changed by adjusting the angle of incidence of the laser beam. All nanostructures were characterized by scanning electron microscopy, and relevant morphological parameters, such as peak-to-peak distances and spatial periods, were assessed. Shapes and heights of some structures were characterized by using focused ion beam cuts to avoid the tip-sample convolution effects typical of atomic force microscopy images. We further demonstrate nanoripple formation on PET foils as thin as 12 µm, 6 µm, and 1.4 µm. The remarkable variety of nanostructures on PET we present here enables customized fabrication for a wide range of applications.

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Section: Introductionsupporting

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nanoscale Dots, Grids, Ripples, and Hierarchical Structures on PET by UV Laser Processing

Buchberger,

Kührer,

Hesser

et al. 2024

Photonics

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“…To further understand the superhydrophobic nature of the rose petal and its PDMS replica, SEM was used to observe the distribution of microgravity and nanovoid on the rose petal and the PDMS replica. According to previous reports, the rose petal surface comprises hierarchical micropapillary arrays and nanofolds on the upper epidermis, while only nanofolds exist on the lower epidermis [17,25,26]. Figure 2B shows the SEM micrograph of dried rose petals.…”

Section: Rose Petal Simulated Pdms/ag Microstructurementioning

confidence: 56%

Rapid Quantitative Determination of Multiple Pesticide Residues in Mango Fruits by Surface-Enhanced Raman Spectroscopy

et al. 2022

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Imidacloprid, acephate, and carbaryl are common insecticides that are extensively used in planting mango, a well-known fruit in Vietnam, to ease mango hopper issues. The accurate detection of pesticide residues is critical for mango export to meet quality criteria. This study developed a novel SERS platform by using polydimethylsiloxane (PDMS) to simulate the rose petal structure incorporated with a silver coating layer and silver nanoparticles (AgNPs) to detect imidacloprid, acephate, and carbaryl in mango fruits. In this paper, the rose petal PDMS/Ag-AgNPs replica was considered the most efficient substrate for SERS measurement with an EF of 4.7 × 107. The Raman spectra of the three insecticides obtained from the PDMS/Ag-AgNPs substrate were clearly observed with their characteristic peaks of 1105 cm−1 for imidacloprid, 1083 cm−1, and 1579 cm−1 for acephate, and 727 cm−1 and 1378 cm−1 for carbaryl. The application of PDMS/Ag-AgNPs substrate in quantitative analysis of the three pesticides in mango fruit was evaluated. As a result, the limit of detection was 0.02 mg/kg for imidacloprid, 5 × 10−5 mg/kg for acephate, and 5 × 10−3 mg/kg for carbaryl. The SERS result also revealed that the pesticide residues in the mango sample were within an acceptable limit. This suggested the possibility of the rose petal PDMS/Ag-AgNPs replica for rapid quantification of pesticide residues not only in mango fruit but also in many other agricultural products.

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“…Lasers are rapidly being employed in cutting, welding, punching, surface modification, laser micromachining, laser etching, and other processing applications as laser technology advances. [1][2][3] Most traditional semiconductor material processing processes are inefficient and have a low-yield rate owing to variances in various materials and their inherent brittleness. Because of its high accuracy, noncontact nature, and ease of control, laser processing has key applications in wafer cutting, scribing, ablation, and slotting.…”

Section: Introductionmentioning

confidence: 99%

Comparison of 20- to 1000-Hz pulsed laser and continuous laser ablation of single-crystal germanium wafers

Sha

Jia

et al. 2023

Opt. Eng.

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.To compare the processing efficiency and quality of 20- to 1000-Hz pulsed laser and continuous laser ablating single-crystal germanium wafers, experiments and numerical simulations were performed. The experiments were conducted by varying the duty cycle and repetition frequency of a pulsed laser to ablate single-crystal germanium with the same total laser energy and irradiation time of 100 ms, and comparing the temperature-rise profile during ablation and the damage morphology after ablation. The temperature-rise curves during the ablation and the damage morphologies after the ablation were compared. Numerical simulations were performed to compute the dislocation field of single-crystal germanium ablated by laser with different parameters to compare the size of the heat-affected zone (HAZ) formed on the sample surface after the laser ablation with different parameters. The results show that the sample surface has the largest ablated pore size and the smallest HAZ after ablation at a laser repetition frequency of 20 Hz and a duty cycle of 5%; the smallest pore size and the largest HAZ after ablation at a laser repetition frequency of 1000 Hz and a duty cycle of 50%, and the continuous laser results are in the middle.

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Laser processing of micro/nano biomimetic structures

Cited by 7 publications

References 62 publications

Nanoscale Dots, Grids, Ripples, and Hierarchical Structures on PET by UV Laser Processing

Nanoscale Dots, Grids, Ripples, and Hierarchical Structures on PET by UV Laser Processing

Rapid Quantitative Determination of Multiple Pesticide Residues in Mango Fruits by Surface-Enhanced Raman Spectroscopy

Comparison of 20- to 1000-Hz pulsed laser and continuous laser ablation of single-crystal germanium wafers

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