title: Low threshold Fabry-Perot optofluidic resonator fabricated by femtosecond laser micromachining.
abstract: We report the realization and characterization of an optofluidic microlaser based on a Fabry-Perot resonator fabricated by exploiting two direct writing fabrication techniques: the femtosecond laser micromachining and the inkjet printing technology. In this way a standard Fabry-Perot cavity has been integrated into an optofluidic chip. When using rhodamine 6G dissolved in ethanol at concentration of 5∙10-3mol/l, laser emission was detected at a threshold energy density of 1.8 μJ/mm2at least one order of magnitude lower than state-of-the-art optofluidic lasers. Linewidth below ~0.6 nm was measured under these conditions with a quality factor Q~103. These performances and robustness of the device makes it an excellent candidate for biosensing, security and environment monitoring applications.
authors.forename: F
authors.initials: F
authors.lastname: Simoni
authors.forename: S
authors.initials: S
authors.lastname: Bonfadini
authors.forename: P
authors.initials: P
authors.lastname: Spegni
authors.forename: S
authors.initials: S
authors.lastname: Lo Turco
authors.forename: D E
authors.initials: DE
authors.lastname: Lucchetta
authors.forename: L
authors.initials: L
authors.lastname: Criante