Hannover 2013 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Photonics II
Q 16.2: Talk
Monday, March 18, 2013, 16:45–17:00, A 310
Exploring whispering-gallery modes in rolled-up vertical microcavities — •Stefan Böttner1, Shilong Li1, Matthew R. Jorgensen1, and Oliver G. Schmidt1,2 — 1Institute for Integrative Nanosciences, IFW Dresden, Helmholtzstr. 20, 01069 Dresden, Germany — 2Material Systems for Nanoelectronics, Chemnitz University of Technology, Reichenhainer Str. 70, 09107 Chemnitz, Germany
Vertically rolled-up microcavities (VRUMs), have a fascinating resonator geometry that confines light in a vertical plane. By carefully designing patterns before roll-up using standard photolithography, the VRUM shape can be tuned to facilitate axial light confinement and a reduction of optical losses to the substrate, both enhancing the optical quality factor [1, 2]. Furthermore VRUMs can be fabricated in large scales and integrated fabrication is, in principle, possible. Their thin walls lead to evanescent fields useful for a variety of applications such as microfluidic sensing or wavelength filtering in optical data processing.
In this talk we present fabrication methods of nontoxic low refractive index SiO2 VRUMs and corresponding optical measurements. We detect optical resonances with high quality factors of more than 5000 using a photoluminescence setup [2]. In a second approach we use evanescently coupled tapered fibers to investigate optical properties at 1550 nm far from the photoluminescence of the VRUMs. This method is also favorable for integrated applications.
[1] Ch. Strelow et al., Phys. Rev. B. 85, 155329 (2012).
[2] S. Böttner et al., Opt. Lett. 37, 5136 (2012).