Influence of optical standing waves on the femtosecond laser-induced forward transfer of transparent thin films

Banks, D.P.; Kaur, K.S.; Eason, R.W.

doi:10.1364/ao.48.002058

Cited by 16 publications

(9 citation statements)

References 37 publications

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“…3. This geometry was inspired by a previous study looking at the effect of optical standing waves on LIFT [25]. From all four corners of the substrate holder a uniform pressure was applied by screws with sprung ball bearings.…”

Section: Methodsmentioning

confidence: 99%

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Improved laser-induced forward transfer of organic semiconductor thin films by reducing the environmental pressure and controlling the substrate–substrate gap width

et al. 2011

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Laser-induced forward transfer (LIFT) has been investigated for bilayer transfer material systems: silver/ organic film (Alq 3 or PFO). The LIFT process uses an intermediate dynamic release layer of a triazene polymer. This study focuses on the effect of introducing a controlled donor-receiver substrate gap distance and the effect of doing the transfer at reduced air pressures, whilst varying the fluence up to ∼200 mJ/cm 2 . The gap between 'in-contact' substrates has been measured to be a minimum of 2-3 µm. A linear variation in the gap width from 'in contact' to 40 µm has been achieved by adding a spacer at one side of the substrate-substrate sandwich. At atmospheric pressure, very little transfer is achieved for Alq 3 , although PFO shows some signs of successful doughnut transfer (with a large hole in the middle) in a narrow fluence range, at gaps greater than 20 µm. For the transfer of Ag/PFO bilayers at atmospheric pressure, the addition of a PFO layer onto the receiver substrate improved the transfer enormously at smaller gaps and higher fluences. However, the best transfer results were obtained at reduced pressures where a 100% transfer success rate is obtained within a certain fluence window. The quality of the pixel morphology at less than 100 mbar is much higher than at atmospheric pressure, particularly when the gap width is less than 20 µm. These results show the promise of LIFT for industrial deposition processes where a gap between the substrates will improve the throughput.

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Section: Methodsmentioning

confidence: 99%

“…The beam was shaped into a square using a 2 × 2 mm 2 square aperture, and the image of the mask was demagnified using a single achromat lens (f = 250 mm) to [25] give a square beam, 0.5×0.5 mm 2 , on the receiver substrate. Figure 1 shows the geometry of the sample with respect to the laser beam and gas chamber.…”

Section: Methodsmentioning

confidence: 99%

Improved laser-induced forward transfer of organic semiconductor thin films by reducing the environmental pressure and controlling the substrate–substrate gap width

et al. 2011

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“…Note that the circular concentric rings that can be seen on the surface of the LIFT-printed discs in Fig. 2 are possibly due to incorrect imaging of the aperture or due to an optical standing wave effect resulting from multiple reflections from within the various carrier, donor and receiver surfaces [13].…”

Section: Resultsmentioning

confidence: 99%

Laser-Induced Forward Transfer-printing of focused ion beam pre-machined crystalline magneto-optic yttrium iron garnet micro-discs

Sones¹,

Feinaeugle²,

Sposito³

et al. 2012

Opt. Express

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We present femtosecond laser-induced forward transfer of focused ion beam pre-machined discs of crystalline magneto-optic yttrium iron garnet (YIG) films. Debris-free circular micro-discs with smooth edges and surface uniformity have been successfully printed. The crystalline nature of the printed micro-discs has not been altered by the LIFT printing process, as was confirmed via micro-Raman measurements.

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“…Using a numerical thin-film interference model and taking into account the electric field of the laser pulses and their multiple reflections, Banks et al [30] show the formation of an optical standing wave. The dependence of the resulting intensity distribution on various process parameters, such as the thickness of the different layers and reflectivity, explains observed variations in deposit morphology and why transfer is possible below estimated threshold values.…”

Section: Lift Process and Modellingmentioning

confidence: 99%

Micro additive manufacturing using ultra short laser pulses

Veld

Overmeyer

Schmidt³

et al. 2015

CIRP Annals

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Influence of optical standing waves on the femtosecond laser-induced forward transfer of transparent thin films

Cited by 16 publications

References 37 publications

Improved laser-induced forward transfer of organic semiconductor thin films by reducing the environmental pressure and controlling the substrate–substrate gap width

Improved laser-induced forward transfer of organic semiconductor thin films by reducing the environmental pressure and controlling the substrate–substrate gap width

Laser-Induced Forward Transfer-printing of focused ion beam pre-machined crystalline magneto-optic yttrium iron garnet micro-discs

Micro additive manufacturing using ultra short laser pulses

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