Low-threshold lasing from organic and polymeric microdisk printed by room temperature atmosphere ink-jet technique

Abstract

ABSTRACT Novel microdisk optical 3D structure fabrication was demonstrated in a room temperature and atmospheric condition with tens-seconds processing duration. This additive manufacturing scheme of polymeric microdisk was based on the ink-jet technique with hyperbranched polymer TZ-001. And whispering-gallery mode (WGM) lasing with a low threshold was confirmed by doping LDS798 or Rhodamine 590 dyes. The diameters both 75 µm were archived. The WGM lasing at around 800 nm wavelength by the LDS798, and at around 600 nm by the Rhodamine 590. Low lasing threshold about 2~3 µJ/mm 2 were confirmed. And shift of peak wavelength was observed on the Rhodamine590:TZ-001 disk. Keywords: Microdisk, ink-jet, WGM, laser, or ganic, dye, polymer, low threshold 1. INTRODUCTION Many research works on microcavities including microdisks have progressively conducted since they have various potential applications owing to their high storage of optical power near specific resonant frequencies leading to high quality factor (Q-factor), supporting of whispering-gallery modes (WGMs). Additionally, WGM microcavities have a special linearity, non-linear optical proper ty, and as well as a very tiny dimensions. Therefore, microcavities are widely applied in various research fields such as sensing [1, 2], low-threshold lasers, nonlinear optics [3], optical signal processing [4], optical frequency co mb [5] and optical communication [6]. As kinds of microcavities, there are vari ous shapes such as microsphere, microrod, mirroring and microdisk. Especially, the disk shaped microcavity is attractive for applications because its disk sh ape is suitable for integration and control of high-ordered WGMs. Additionally, microdisk cavities previously were demonstrated high performances such as high Q-factors and ultra-low lasing thresholds [7-14]. As an ultra-high Q-factor research, SiO