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Optica Publishing Group
  • 2017 European Conference on Lasers and Electro-Optics and European Quantum Electronics Conference
  • (Optica Publishing Group, 2017),
  • paper CE_7_5

Water-like-refractive-index Microdisk Cavity by the Ink-jet Printing Method

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Abstract

Microdisk cavities are a kind of whispering gallery mode (WGM) resonators, which are continually studied owing to their high quality factor (Q factor) and small mode volume. These microdisks were previously fabricated using a subtractive method [1, 2] such as photolithography method. These subtractive methods are suitable for the mass-produced industrial structure due to an ability of the mass fabrication in large areas. On the other hand, we recently developed an ink-jet printing method as a novel, simple fabrication process for a full-polymeric fine microdisk, which is very superior at producing low waste materials, requires little energy consumption, and is suitable for on-site and on-demand fabrication because it is an additive method [3]. Since this method provides a completely organic microdisk platform, it is highly compatible with the biosensor. However, since the refractive index of used hyper-branched polymers (HBP) (n = 1.45-1.89) is a relatively high among organic materials, it is not preferable to use previous HBPs in a biosensor using a water-based liquid sample (n ~ 1.33) because of the short interaction length owing to reducing the evanescent part. In this study, we experimentally succeeded fabrication of microdisks with water-like refractive index by the ink-jet printing method. Additionally, the low-refractive-index microdisks doped with Rhodamine6G dye successfully achieved WGM lasing. This low-refractive-index microdisk cavity by ink-jet printing method is the first demonstration under atmospheric pressure and RT among inorganic microdisks.

© 2017 IEEE

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