title: Extreme ultra-low lasing threshold of full-polymeric fundamental microdisk printed with room-temperature atmospheric ink-jet technique.
abstract: We experimentally demonstrated an extreme ultra-low lasing threshold from full-polymeric fundamental microdisk cavities fabricated by a novel fabrication method, the ink-jet printing method, which is much simpler and easier than previous methods such as lithography. The ink-jet printing method provides additive, room-temperature atmospheric, rapid fabrication with only two steps: (i) stacking cladding pedestal and waveguiding disk spots using the ink-jet technique, and (ii) partial etching of the cladding pedestal envelope. Two kinds of low-viscosity polymers successfully formed microdisks with high surface homogeneity, and one of the polymers doped with LDS798 dye yielded whispering-gallery-mode lasing. The fundamental disks exhibited an extremely ultra-low lasing threshold of 0.33 μJ/mm(2) at a wavelength of 817.3 nm. To the best of our knowledge, this lasing threshold is the lowest threshold obtained among both organic and inorganic fundamental microdisk cavity lasers with a highly confined structure.
authors.affiliation: Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan.
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Yoshioka
authors.affiliation: Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan.
authors.forename: Tomoya
authors.initials: T
authors.lastname: Ota
authors.affiliation: Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan.
authors.forename: Cong
authors.initials: C
authors.lastname: Chen
authors.affiliation: Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan.
authors.forename: Soichiro
authors.initials: S
authors.lastname: Ryu
authors.affiliation: NISSAN CHEMICAL INDUSTRIES, LTD, Chiba 274-0052, Japan.
authors.forename: Kei
authors.initials: K
authors.lastname: Yasui
authors.affiliation: Graduate School and Faculty of Information Science and Electrical Engineering, Kyushu University, Fukuoka 819-0395, Japan.
authors.forename: Yuji
authors.initials: Y
authors.lastname: Oki