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Award ID contains: 1711801

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Micromachines)
    We report a microfluidic droplet generator which can produce single and compound droplets using a 3D axisymmetric co-flow structure. The design considered for the fabrication of the device integrated a user-friendly and cost-effective 3D printing process. To verify the performance of the device, single and compound emulsions of deionized water and mineral oil were generated and their features such as size, generation frequency, and emulsion structures were successfully characterized. In addition, the generation of bio emulsions such as alginate and collagen aqueous droplets in mineral oil was demonstrated in this study. Overall, the monolithic 3D printed axisymmetric droplet generator could offer any user an accessible and easy-to-utilize device for the generation of single and compound emulsions. 
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  2. ; ; ; ; ; ; ; ; (, APL Photonics)
    We report on reversible and continuously deformable soft micro-resonators and the control of their resonance split and directional emission. Assisted by computerized holographic-tweezers, functioning as an optical deformer of our device, we gradually deform the shape and change the functionality of a droplet whispering-gallery cavity. For example, we continuously deform hexagonal cavities to rectangular ones and demonstrate switching to directionally emitting mode-of-operation, or splitting a resonant mode to a 10-GHz separated doublet. A continuous trend of improving spatial light modulators and tweezers suggests that our method is scalable and can control the shape and functionality of many individual devices. We also demonstrate optional solidification, proving the feasibility of transformer-enabled applications, including in printing optical circuits and multiwavelength optical networks. 
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  3. ; ; ; ; ; (, Physical Review X)
    null (Ed.)
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  4. ; (, Optics Letters)
    Interaction between whispering gallery mode (WGM) resonators and nanoparticles is an area of active interest in fundamental understanding of nanoparticle-induced spectral modifications of the WGM resonances in sensing applications. Existing theories of this phenomenon assume that nanoparticles can be described taking into account only the electrodipole contribution to the field of the nanoparticle. In this paper, we explore theoretically the effects of the magnetodipole contribution to the nanoparticle’s field and show that this contribution might become significant even in situations when electrodipole approximation is expected to remain valid. 
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  5. ; (, Physical Review E)