Optical contact and van der Waals interactions: the role of the surface topography in determining the bonding strength of thick glass plates

Greco, Venanzio Raffaele; Marchesini, Flavio H.; Molesini, Giuseppe

doi:10.1088/1464-4258/3/1/314

Cited by 46 publications

(26 citation statements)

References 15 publications

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“…Apart from laser welding [15][16][17], optical contact bonding allows the long-term connection of two optical components by contacting without any additional cement [18]. In this case, bonding occurs on the basis of pure physical and intermolecular adhesion that arises as long as the form deviation between both components is smaller than one nanometre [19,20]. The strength of such connection can furthermore be improved by the additional application of sol gel nanoparticles [21] or the approach of activated covalent bonding where hydroxyl groups are attached on the glass surfaces prior to contacting [22,23].…”

Section: Introductionmentioning

confidence: 99%

Improving the Adhesiveness of Cemented Glass Components by DBD Plasma Pre-Treatment at Atmospheric Pressure

Gerhard¹,

Mielke²,

Brückner³

et al. 2019

Applied Sciences

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Cemented optical components and groups are essential devices for the realisation of modern systems and apparatuses used in a broad range of different applications such as telecommunications, imaging and even surgery. However, various parameters may affect the stability of cemented connections. In this context, the impact of dielectric barrier discharge plasma at atmospheric pressure on the adhesiveness of cemented glass components was evaluated in the present work. For this purpose, the plasma-induced change in surface wettability and energy as well as the cement’s adhesive pull strength was measured. Investigations were performed on samples, which were subject to different procedures of artificial ageing. It is shown that the adhesive pull strength of cemented glass components was notably increased after a short-term plasma treatment of merely 10 s due to an enhanced wettability of the applied UV-curing optical cement. The pull strength, i.e., the adhesiveness of cemented glasses was increased by a factor of 2.1 to 4.6, depending on the particularly applied artificial ageing procedure. The results and findings finally demonstrate the high potential of the applied short-term plasma treatment as a cleaning and surface activation step in optics manufacturing on an industrial scale.

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Section: Introductionmentioning

confidence: 99%

Improving the Adhesiveness of Cemented Glass Components by DBD Plasma Pre-Treatment at Atmospheric Pressure

Gerhard¹,

Mielke²,

Brückner³

et al. 2019

Applied Sciences

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“…Conversely, conventional joining technologies without additives are e.g. optical contacting [3], thermal diffusion bonding [4] or CO 2 -laser welding [5]. Here again the methods are not suited for all purposes: optical contacting is susceptible to impact loads [6], thermal diffusion bonding requires long processing times and CO 2 -laser welding requires a subsequent post-heating.…”

Section: Introductionmentioning

confidence: 99%

“…The range of these forces is limited to a few hundred nanometers, because the attracting potential for two plane surfaces reduces as 1/d 2 with distance d [3]. The optically contacted area lacks reflections from the joining surfaces, since the gap is so small that that evanescent waves generated by an impinging light wave at the surface of the first glass plate excite, almost without attenuation, a propagating wave inside the other plate.…”

Section: Introductionmentioning

confidence: 99%

Gap bridging in joining of glass using ultra short laser pulses

Cvecek¹,

Odato²,

Dehmel³

et al. 2015

Opt. Express

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Abstract:Glass welding by ultra-short laser pulses provides hermetic welding seams with high mechanical stability. The required distance between the samples must be extremely small (<100nm), otherwise cracks will form inside the seam reducing its stability. However, to achieve such small gaps the roughness of the samples must be small enough necessitating additional polishing. Additionally, Van-der-Waals forces grow substantial at such distances thereby effectively preventing sample movement and an easy and precise sample alignment. Here we present a method utilizing ultra-short laser pulses which exploits a volume expansion of irradiated glass enabling the joining of glass plates across gaps of up to 1µm.

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“…Optical contact bonding the most common bonding technique for glasses, which is a glueless process whereby two closely conformal surfaces are joined together, being held purely by intermolecular forces. But this adhesive-free process need ultra flat and ultra clean surfaces with the same curvature [8]. Furthermore the bond strength is typically very weak (a few kPa) and is highly susceptible to impact load.…”

Section: Introductionmentioning

confidence: 99%

Direct welding of fused silica with femtosecond fiber laser

2012

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Development of techniques for joining and welding materials on a micrometer scale is of great importance in a number of applications, including life science, sensing, optoelectronics and MEMS packaging. In this paper, methods of welding and sealing optically transparent materials using a femtosecond fiber laser (1 MHz & 1030 nm) were demonstrated which overcome the limit of small area welding of optical materials from previous work. When fs laser pulses are tightly focused at the interface of the materials, localized heat accumulation based on nonlinear absorption and quenching occur around the focal volume, which melts and resolidifies, thus welds the materials without inserting an intermediate layer.The welding process does not need any preprocessing before the welding. At first, single line welding results with different laser parameters was studied. Then successful bonding between fused silica with multi line scanning method was introduced. Finally, complete sealing of transparent materials with fs laser was demonstrated. Scanning electron microscopy (SEM) images of the sample prove successful welding without voids or cracks. This laser micro-welding technique can be extended to welding of semiconductor materials and has potential for various applications, such as optoelectronic devices and MEMS system.

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Optical contact and van der Waals interactions: the role of the surface topography in determining the bonding strength of thick glass plates

Cited by 46 publications

References 15 publications

Improving the Adhesiveness of Cemented Glass Components by DBD Plasma Pre-Treatment at Atmospheric Pressure

Improving the Adhesiveness of Cemented Glass Components by DBD Plasma Pre-Treatment at Atmospheric Pressure

Gap bridging in joining of glass using ultra short laser pulses

Direct welding of fused silica with femtosecond fiber laser

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