13 May 2010 Ink-jet process for creating fluorescent microdroplet
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Fluorescent droplet cavities were created in elastomer by using an ink-jet method. A solution for creating droplets was composed of fluorescent rhodamine, alcohol, and surfactant. Polysiloxane was used as a matrix, since its elasticity allowed droplet deformation that caused resonance-wavelength shift. The injected dye solution self-formed a sphere in the raw liquid of polysiloxane due to surface tension. The polysiloxane matrix solidified in 8 h after adding a curing agent. The droplet exhibited whispering-gallery-mode emission when it was excited by a frequency-doubled Nd:YAG laser pulse. The resonance peaks shifted to either short or long wavelengths as the droplet deformed by pressing the elastomer.
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Mitsunori Saito, Kentaro Koyama, "Ink-jet process for creating fluorescent microdroplet", Proc. SPIE 7716, Micro-Optics 2010, 77161T (13 May 2010); doi: 10.1117/12.853766; https://doi.org/10.1117/12.853766

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