Simple interference method of diffraction grating generation for integrated optics by the use of a Fresnel mirror

Malag, A.

doi:10.1016/0030-4018(80)90313-2

Cited by 8 publications

(7 citation statements)

References 16 publications

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“…Looking at the superimposed profile in cross-section, a wave-like intensity distribution profile with broad valleys and narrow peaks emerges as described by Müller et al The periodicity of these line-like structures is linked to the incident angle of single laser beam on the sample surface. This interference setup hereby is similar to the Fresnel mirror setup, which describes the periodicity p according to eq . p = λ 2 × tan nobreak0em.25em⁡ α where λ is the wavelength of a laser beam and α is the incident angle of a single partial beam. As the surface is irradiated with a laser beam, the energy is first absorbed by the electrons and then transferred onto the lattice until a thermal equilibrium is achieved .…”

Section: Methodsmentioning

confidence: 99%

“…Looking at the superimposed profile in crosssection, a wave-like intensity distribution profile with broad valleys and narrow peaks emerges as described by Muller et al 38 The periodicity of these line-like structures is linked to the incident angle of single laser beam on the sample surface. This interference setup hereby is similar to the Fresnel mirror setup, 39 which describes the periodicity p according to eq 1.…”

Section: Ultrashort Pulsed Direct Laser Interference Patterning (Usp-...mentioning

confidence: 99%

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Surface Modification of Brass via Ultrashort Pulsed Direct Laser Interference Patterning and Its Effect on Bacteria-Substrate Interaction

Ahmed

Müller

Bruyère

et al. 2023

ACS Appl. Mater. Interfaces

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In recent decades, antibiotic resistance has become a crucial challenge for human health. One potential solution to this problem is the use of antibacterial surfaces, i.e., copper and copper alloys. This study investigates the antibacterial properties of brass that underwent topographic surface functionalization via ultrashort pulsed direct laser interference patterning. Periodic line-like patterns in the scale range of single bacterial cells were created on brass with a 37% zinc content to enhance the contact area for rod-shaped Escherichia coli (E. coli). Although the topography facilitates attachment of bacteria to the surface, reduced killing rates for E. coli are observed. In parallel, a high-resolution methodical approach was employed to explore the impact of laser-induced topographical and chemical modifications on the antibacterial properties. The findings reveal the underlying role of the chemical modification concerning the antimicrobial efficiency of the Cu-based alloy within the superficial layers of a few hundred nanometers. Overall, this study provides valuable insight into the effect of alloy composition on targeted laser processing for antimicrobial Cu-surfaces, which facilitates the thorough development and optimization of the process concerning antimicrobial applications.

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Section: Methodsmentioning

confidence: 99%

Section: Ultrashort Pulsed Direct Laser Interference Patterning (Usp-...mentioning

confidence: 99%

Surface Modification of Brass via Ultrashort Pulsed Direct Laser Interference Patterning and Its Effect on Bacteria-Substrate Interaction

Ahmed

Müller

Bruyère

et al. 2023

ACS Appl. Mater. Interfaces

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“…This can be used whenever a regular line pattern is needed, e.g. to structure regular patterns for optical gratings into photoresist [2] or for microfluidic diffusion sensors [3]. If the angle between the mirrors is small, a central intensity maximum is achieved that can be propagated over long distances.…”

Section: Introductionmentioning

confidence: 99%

Adaptive Fresnel mirror for ultrashort-pulse laser beam shaping

Brunne¹,

Wapler²,

Wallrabe³

et al. 2012

2012 International Symposium on Optomechatronic Technologies (ISOT 2012)

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In this contribution we present a fast and robust adaptive Fresnel mirror for advanced nanomachining applications with femtosecond lasers. The Fresnel mirror consists of two mirror segments that are actuated with a piezoelectric bimorph. All components are fabricated by low-cost rapid prototyping processes without the need for a clean-room. Light propagation and pulse transfer have been characterized as well as the static and dynamic actuation properties.Adaptive Fresnel mirror, nanomachining, femtosecond laser machining, LIPSS, piezoelectric MOEMS

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“…Fresnel mirrors can, for example, be used to fabricate linear optical gratings directly into the photoresist without the use of a photomask [3]. It was shown that an adaptive Fresnel mirror can be used in adaptive pulse autocorrelation [4], and for direct nano-machining of subwavelength structures on silicon or dielectric substrates by laser-induced periodic surface structures (LIPSS) [5,6].…”

Section: Introductionmentioning

confidence: 99%

Micro Fresnel mirror array with individual mirror control

Bruno

Schütze

Grünwald

et al. 2020

Smart Mater. Struct.

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We present the design and fabrication of a miniaturized array of piezoelectrically actuated high speed Fresnel mirrors with individual mirror control. These Fresnel mirrors can be used to generate propagation invariant and self-healing interference patterns. The mirrors are actuated using piezobimorph actuators, and the consequent change of the tilting angle of the mirrors changes the fringe spacing of the interference pattern generated. The array consists of four Fresnel mirrors each having an area of 2x2 mm 2 arranged in a 2x2 configuration. The device, optimized using FEM simulations, is able to achieve maximum mirror deflections of 15 mrad, and has a resonance frequency of 28 kHz.

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Simple interference method of diffraction grating generation for integrated optics by the use of a Fresnel mirror

Cited by 8 publications

References 16 publications

Surface Modification of Brass via Ultrashort Pulsed Direct Laser Interference Patterning and Its Effect on Bacteria-Substrate Interaction

Surface Modification of Brass via Ultrashort Pulsed Direct Laser Interference Patterning and Its Effect on Bacteria-Substrate Interaction

Adaptive Fresnel mirror for ultrashort-pulse laser beam shaping

Micro Fresnel mirror array with individual mirror control

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