Ultrafast properties of femtosecond-laser-ablated GaAs and its application to terahertz optoelectronics

Madéo, Julien; Margiolakis, Athanasios; Zhao, Zhenyu; Hale, Peter John; Man, Michael K. L.; Zhao, Quanzhong; Peng, Wei; Shi, Wangzhou; Dani, Keshav M.

doi:10.1364/ol.40.003388

Cited by 24 publications

(13 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…I had used femtosecond lasers to engineer optoelectric devices, image electrons in motion in a solar cell device, and study photocarrier dynamics in novel materials. 1 But never had I fired laser beams at a painting.…”

Section: Readers' Forummentioning

confidence: 99%

Commentary: Pursuing science across nationalities and disciplines

Dani

2017

Physics Today

View full text Add to dashboard Cite

Section: Readers' Forummentioning

confidence: 99%

Commentary: Pursuing science across nationalities and disciplines

Dani

2017

Physics Today

View full text Add to dashboard Cite

“…With respect to the manifold potential applications of periodically structured surfaces, the aforementioned types of LIPSS have been intensively investigated on metals [7,8], semiconductors [3,4], and dielectrics [9][10][11]. Specifically, periodic surface structures can be used for controlling cell growth in biotechnology [12], friction and wear optimization [13], testing of mechanical properties [14], and influencing the emission properties of THz transmitters [15]. In particular, the influence of LSFL on the wetting properties of surfaces can be applied in microfluidics [16] and to self-cleaning components [17].…”

Section: Introductionmentioning

confidence: 99%

Time Dependence of Wetting Behavior Upon Applying Hierarchic Nano-Micro Periodic Surface Structures on Brass Using Ultra Short Laser Pulses

et al. 2018

View full text Add to dashboard Cite

We present a comprehensive experimental study on laser-induced hierarchic nano-micro periodic surface structures on brass that influences wetting behavior. Using ultra short laser pulses with a wavelength of 1030 nm, large scaled areas completely covered by laser-induced periodic surface structures (LIPSS) are generated with these areas being superimposed by ablation trenches and u-ripples. The influence of the incident laser fluence and pulse overlap on the apparent contact angle for coverage of the surface with distilled water with a surface tension of 74 mN/m are examined with its temporal evolution being observed over a period of two weeks. Our results show an initial drop in the apparent contact angle below the angle of an unstructured surface. Using atomic force microscopy, the roughness factor described by the Wenzel model is determined and compared to the roughness factor given by the apparent contact angle measurement. The ascertained difference in roughness cannot be entirely attributed to the topography of the laser-structured surface. We suggest that changes in the surface chemistry additionally alter the wetting behavior as confirmed by X-ray photoelectron spectroscopy (XPS) measurements. On a time scale of days after laser irradiation, the apparent contact angle increases into the hydrophobic range. Both the absolute apparent contact angle and this temporal change reveal a pronounced dependence on the applied laser fluence and pulse overlap. In particular, increasing both, the fluence and the pulse overlap leads to smaller apparent contact angles directly after the irradiation and to higher apparent contact angles after an observation period of two weeks.

show abstract

“…Thus, one can alter the local structure of the material or even create a void with high spatial precision. This has led to a number of useful applications of ultrafast laser processing, such as high-precision micromachining [1,3,4], laser-processed black silicon for photovoltaic applications [5], and engineering opto-electronic properties through femtosecond laser ablation for terahertz devices [6]. Another important advantage of femtosecond laser processing is the minimization of thermal damage [3,4].…”

Section: Introductionmentioning

confidence: 99%

Obtaining Cross-Sections of Paint Layers in Cultural Artifacts Using Femtosecond Pulsed Lasers

et al. 2017

Self Cite

View full text Add to dashboard Cite

Recently, ultrafast lasers exhibiting high peak powers and extremely short pulse durations have created a new paradigm in materials processing. The precision and minimal thermal damage provided by ultrafast lasers in the machining of metals and dielectrics also suggests a novel application in obtaining precise cross-sections of fragile, combustible paint layers in artwork and cultural heritage property. Cross-sections of paint and other decorative layers on artwork provide critical information into its history and authenticity. However, the current methodology which uses a scalpel to obtain a cross-section can cause further damage, including crumbling, delamination, and paint compression. Here, we demonstrate the ability to make controlled cross-sections of paint layers with a femtosecond pulsed laser, with minimal damage to the surrounding artwork. The femtosecond laser cutting overcomes challenges such as fragile paint disintegrating under scalpel pressure, or oxidation by the continuous-wave (CW) laser. Variations in laser power and translational speed of the laser while cutting exhibit different benefits for cross-section sampling. The use of femtosecond lasers in studying artwork also presents new possibilities in analyzing, sampling, and cleaning of artwork with minimal destructive effects.

show abstract

Ultrafast properties of femtosecond-laser-ablated GaAs and its application to terahertz optoelectronics

Cited by 24 publications

References 23 publications

Commentary: Pursuing science across nationalities and disciplines

Commentary: Pursuing science across nationalities and disciplines

Time Dependence of Wetting Behavior Upon Applying Hierarchic Nano-Micro Periodic Surface Structures on Brass Using Ultra Short Laser Pulses

Obtaining Cross-Sections of Paint Layers in Cultural Artifacts Using Femtosecond Pulsed Lasers

Contact Info

Product

Resources

About