title: Single rolled-up InGaAs/GaAs quantum dot microtubes integrated with silicon-on-insulator waveguides.
abstract: We report on single rolled-up microtubes integrated with silicon-on-insulator waveguides. Microtubes with diameters of ~7 μm, wall thicknesses of ~250 nm, and lengths greater than 100 μm are fabricated by selectively releasing a coherently strained InGaAs/GaAs quantum dot layer from the handling GaAs substrate. The microtubes are then transferred from their host substrate to silicon-on-insulator waveguides by an optical fiber abrupt taper. The Q-factor of the waveguide coupled microtube is measured to be 1.5×10(5), the highest recorded for a semiconductor microtube cavity to date. The insertion loss and extinction ratio of the microtube are 1 dB and 34 dB respectively. By pumping the microtube with a 635 nm laser, the resonance wavelength is shifted by 0.7 nm. The integration of InGaAs/GaAs microtubes with silicon-on-insulator waveguides provides a simple, low loss, high extinction passive filter solution in the C+L band communication regime.
authors.affiliation: Dept. of Electrical and Computer Engineering, McGill University, Montreal, QC, H3A 2A7 Canada. tianzhaobing@gmail.com
authors.forename: Zhaobing
authors.initials: Z
authors.lastname: Tian
authors.forename: Venkat
authors.initials: V
authors.lastname: Veerasubramanian
authors.forename: Pablo
authors.initials: P
authors.lastname: Bianucci
authors.forename: Shouvik
authors.initials: S
authors.lastname: Mukherjee
authors.forename: Zetian
authors.initials: Z
authors.lastname: Mi
authors.forename: Andrew G
authors.initials: AG
authors.lastname: Kirk
authors.forename: David V
authors.initials: DV
authors.lastname: Plant
mesh_terms: D001152:Arsenicals / Q000737:chemistry*; D005336:Fiber Optic Technology / Q000295:instrumentation / Q000379:methods*; D005708:Gallium / Q000737:chemistry*; D007204:Indium / Q000737:chemistry*; D007834:Lasers; D045663:Quantum Dots; D012666:Semiconductors; D012825:Silicon / Q000737:chemistry*; D013685:Telecommunications / Q000295:instrumentation
chemical_list: D001152:Arsenicals; D007204:Indium; C043055:gallium arsenide; D005708:Gallium; D012825:Silicon