Transferable ultra-thin multi-level micro-optics patterned by tunable photoreduction and photoablation for hybrid optics

Lee, Hyub; Low, Mun Ji; Lim, C. H.; An, Jianing; Sandeep, C. S. Suchand; Rohith, Thazhe Madam; Rhee, Hyug-Gyo; Murukeshan, Vadakke Matham; Kim, Young‐Jin

doi:10.1016/j.carbon.2019.04.085

Cited by 21 publications

(18 citation statements)

References 44 publications

(51 reference statements)

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“…At present, composites are used in a wide range of applications, including strain sensors, electronic displays, optical attenuators and smart windows [4][5][6][7][8][9][10]. Composites, which use carbon materials in high-performance applications, have been widely used owing to their strengthening effect, high stiffening and feasible preparation, such as graphene oxide-silica nanohybrid [11][12][13][14][15][16], graphene/polydimethylsiloxane [17,18] and polylactic acid (PLA) as a host polymer and different forms of carbon fillers [19,20]. Considerable progress has already been made in these fields.…”

Section: Introductionmentioning

confidence: 99%

Composite Films of Polydimethylsiloxane and Micro-Graphite with Tunable Optical Transmittance

Wang

Sheng

et al. 2019

Applied Sciences

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In this paper we introduce a polydimethylsiloxane (PDMS) composite fabricated using a simple production process and demonstrate the optical transmittance properties of this composite in the 300–1000 nm wavelength region. We control the material’s transmittance by varying the microcrystalline graphite powder concentration or the composite film’s thickness. In addition, we tailor the specimens into various trapezoidal shapes and load these specimens by mechanically stretching them in the direction perpendicular to both their base lines and their top lines. The advantage of this method is that a wide range of transmittance properties can be obtained for a given specimen. Furthermore, samples with different trapezoidal shapes have different transmittance tuning capabilities.

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Section: Introductionmentioning

confidence: 99%

Composite Films of Polydimethylsiloxane and Micro-Graphite with Tunable Optical Transmittance

Wang

Sheng

et al. 2019

Applied Sciences

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“…[ 9c ] In the photoreduction process from GO to rGO, three distinct photoreduction regimes were identified (see Figure a), namely I) the onset of photoreduction, II) photoreduction and ablation, and III) ablation. [ 9c,19 ] Ablation of GO and/or rGO can occur when the laser fluence exceeds the material's ablation threshold. During the ablation process, the material gets vaporized and is expelled from the film, resulting in the thinning of the film.…”

Section: Resultsmentioning

confidence: 99%

Direct Laser Writing of Graphene‐Based Electrical Interconnects for Printed Circuit Board Repair

Lim

Sandeep

Murukeshan

et al. 2021

Adv Materials Technologies

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Malfunctions in printed circuit boards (PCBs) are often caused by damaged copper traces. Printing materials such as metal nanoparticles, conductive polymers, and graphene along with novel printing methods are being actively explored for repairing the conductive connections in PCBs. Because of its high‐resolution capability, direct writing of conductive traces gets significant attention, especially with the widespread use of flexible PCBs. Graphene is an ideal material for such applications due to its excellent electrical and mechanical properties. However, there have been limited reports on graphene‐based methods for the facile fabrication of conductive traces. A novel method of femtosecond laser direct writing of graphene traces by the photoreduction of graphene oxide (GO) to conductive reduced GO (rGO) for repair and modification of legacy PCBs is reported. A trace‐width resolution of 28.4 μm is achieved over a large patterning area of 100 mm × 100 mm. The rGO thickness is found to be tunable from 0.6 to 4.4 μm, while the sheet resistance is minimized to 100 Ω sq−1. The system capability is demonstrated by printing conductive traces on top of a flexible substrate to form a closed path for turning on a light‐emitting diode, as well as, by repairing a commercial PCB.

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“…One type of the FZP, termed as phase FZP, is fabricated as the alternate concentric annular grooves are cut in a single piece of optics [130] as Figure 19(d, f). Alternatively, for the amplitude FZP as shown in Figure 19(e, g), different 54 materials or a material with different composite dense and refractive index can be used to make up alternate concentric rings [130], [131]. Since the amplitude FZP use the diffraction instead of the refraction at the lens surface to manipulate the light beams, it includes much complicated calculations to produce the FZP that fulfills the beam transformation requirement.…”

Section: Diffractive Lens's Transformation On Beammentioning

confidence: 99%

“…Recent researches have reported that rGO structures can be fabricated by photoreduction or fast thermal quenching, and but still have limitation of the photo-mask design and optical phase delay [131], [137]. To achieve non-mask rapid fabrication with the sub-micron feature size, we set up the femtosecond laser direct scanning (FsLDS) system to print the rGO diffractive lens via twophoton photoreduction.…”

Section: )mentioning

confidence: 99%

Femtosecond laser additive manufacturing of micro-3D optical devices and their applications

Li¹

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Transferable ultra-thin multi-level micro-optics patterned by tunable photoreduction and photoablation for hybrid optics

Cited by 21 publications

References 44 publications

Composite Films of Polydimethylsiloxane and Micro-Graphite with Tunable Optical Transmittance

Composite Films of Polydimethylsiloxane and Micro-Graphite with Tunable Optical Transmittance

Direct Laser Writing of Graphene‐Based Electrical Interconnects for Printed Circuit Board Repair

Femtosecond laser additive manufacturing of micro-3D optical devices and their applications

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