title: Dual-rail nanobeam microfiber-coupled resonator.
abstract: A microfiber-coupled dual-rail nanobeam resonator is proposed and demonstrated. The dual-rail scheme is employed to encourage the overlap between the light emitter and the air mode. The one-dimensional resonant cavity is formed by contacting a curved microfiber with the dual-rail nanobeam. The finite width of the dual-rail nanobeam turns out to be advantageous for both out-coupling with the microfiber and broader tuning of resonant wavelength. By employing InGaAsP quantum well gain medium, a simple and robust reconfigurable laser is created. Experimentally we measure a quality factor of 11,000 and out-coupling efficiency of 30%. The spontaneous emission factor (β) of the nanobeam laser is measured to be 0.16. Computationally we identified a resonant cavity with a quality factor over 6 × 10(5) and out-coupling efficiency over 90%.
authors.affiliation: Department of Physics, KAIST, Daejeon 305-701, South Korea.
authors.forename: Hee-Jin
authors.initials: HJ
authors.lastname: Lim
authors.forename: Chang-Min
authors.initials: CM
authors.lastname: Lee
authors.forename: Byeong-Hyeon
authors.initials: BH
authors.lastname: Ahn
authors.forename: Yong-Hee
authors.initials: YH
authors.lastname: Lee
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D005336:Fiber Optic Technology / Q000295:instrumentation*; D008904:Miniaturization; D036103:Nanotechnology / Q000295:instrumentation*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*; D014159:Transducers