Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 61: Photonics II

Q 61.8: Vortrag

Freitag, 21. März 2014, 15:45–16:00, UDL HS3038

Vertically Rolled-Up High Quality TiO2 Optical Microcavities and Integration with Optical Waveguides — •abbas madani, stefan böttner, matthew r. jorgensen, and oliver g. schmidt — Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany

Recently, vertically rolled-up optical microcavities (VRUMs), as a novel form of cavities, have opened up several attractive applications. Key features of VRUMs include their flexibility in materials choice,the capability for on-chip integration,their ultra-thin walls and hollow core structure. While recent demonstrations of VRUMs have highlighted their potential use in optoelectronic applications,improvements are possible with respect to the choice of material. TiO2 has many properties favorable for VRUMs including a high refractive index, a large Kerr nonlinearity, a wide transparency window,and biocompatibility. In this work, design and fabrication of high Q-factor TiO2 VRUMs with diameters on the order of micrometers, very thin and smooth tube walls, operation at both telecom and visible wavelengths are reported. These VRUMs are achieved by the controlled release and roll-up of differentially strained TiO2 bilayered nanomembranes. Optical characterization of these resonators reveals quality factors as high as 3.8*103 in the telecom wavelength range when a TiO2 VRUM is interfaced with a tapered optical fiber [1].Finally, the importance and challenge of integration of TiO2 resonators with optical waveguides will be discussed along with the first results of transmission measurements in the telecom ranges.[1]A.Madani et al,Optics Letter(in press,2013).