研究目的
To deposit a nanodot array in a single shot using laser-induced forward transfer (LIFT) with a femtosecond laser interference pattern, exploring the potential for high-purity, catalyst-free nanodot fabrication without post-cleaning or alignment processes.
研究成果
The application of a femtosecond laser interference pattern to LIDT successfully deposited an array of Au nanodots in a single shot, with the smallest nanodot diameter being 355 nm. The technique offers advantages such as high purity, no need for post-cleaning or alignment processes, and the potential for expanding the application fields of nanodot arrays in photonics, plasmonics, and nanotechnology.
研究不足
The study notes some missing and surplus depositions in the nanodot array, attributed to failure in ejection or deposition and dislocation in or after the process. The uniformity of size and shape could potentially be improved by using a flattop beam.
1：Experimental Design and Method Selection:
A femtosecond laser with a 785 nm wavelength and a 240 fs pulse width was used to generate an interference pattern for LIDT. The beam was split by a diffractive optical element (DOE) into four 1st order diffracted beams and aimed at a thin Au donor film through a transparent substrate via a de-magnification system.
2：Sample Selection and Data Sources:
A thin Au donor film (40 nm) and a thin Au receiver film (100 nm) were used. The LIDT experiment was performed in a vacuum chamber.
3：List of Experimental Equipment and Materials:
Femtosecond laser, diffractive optical element (DOE: HOLO/OR Ltd.), convex lenses (f1 = 200 mm, f2 = 50 mm), vacuum chamber.
4：Experimental Procedures and Operational Workflow:
The interference pattern was applied to the donor film, and the resulting nanodot array was observed using optical and scanning electron microscopy (SEM).
5：Data Analysis Methods:
The size and spacing of nanodots were measured from SEM images to evaluate the deposition efficiency and structure uniformity.
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