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Optically Trapping Large Metallic Particles in Air Using a &#39;Boat&#39; Trap with Direct-Drawn Sidewalls

We present a method for achieving stable optical trapping of large metallic particles (&#62;1.16 &#181;m mean diameter solid gold particles, and &#62;100 ...

Brigham Young University

Thin liquid films (TLF) have fundamental and technological importance ranging from the thermodynamics of cell membranes to the safety of light-water cooled nuclear reactors. The creation of stable water TLFs, however, is very difficult. In this paper, the realization of thin liquid films of water with custom 3D geometries that persist indefinitely in ambient environments is reported. The wetting films are generated using microscale "mounts" fed by microfluidic channels with small feature sizes and large aspect ratios. These devices are fabricated with a custom 3D printer and resin, which were developed to print high resolution microfluidic geometries as detailed in Reference 26. By modifying the 3D-printed polymer to be hydrophilic and taking advantage of well-known wetting principles and capillary effects, self-sustaining microscale "water fountains" are constructed that continuously replenish water lost to evaporation while relying on surface tension to stabilize their shape. To the authors' knowledge, this is the first demonstration of stable sub-micron thin liquid films (TLFs) of pure water on curved 3D geometries.

Self-Sustaining 3D Thin Liquid Films in Ambient Environments.

We demonstrate a novel method to automate tuning of microring resonators using 3D-printed microfluidic control capable of resonance wavelength shifts of 4 nm. We use a custom 3D-printer that can fabricate microfluidic devices with sub-10 μm features and that perform automatic pumping, mixing, and dilution operations.

Automated Photonic Tuning of Silicon Microring Resonators Using a 3D-printed Microfluidic Mixer.

Microdroplet resonators provide an excellent tool for optical studies of water, but water microdroplets are difficult to maintain outside a carefully controlled environment. We present a method for maintaining a water microdroplet resonator on a 3D-printed hydrophobic surface in an ambient environment. The droplet is maintained through a passive microfluidic system that supplies water to the droplet through a vertical channel at a rate equivalent to its evaporation. In this manner, we are able to create and passively maintain water microdroplet resonators with quality factors as high as 3×108.

Article	Year
Self-Sustaining 3D Thin Liquid Films in Ambient Environments. Advanced materials interfaces\| PubMed ID: 33072494	2020
Automated Photonic Tuning of Silicon Microring Resonators Using a 3D-printed Microfluidic Mixer. OSA continuum\| PubMed ID: 36406286	2021
Self-Sustaining Water Microdroplet Resonators Using 3D-Printed Microfluidics. Micromachines\| PubMed ID: 38675235	2024

Ryan M. Camacho

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