Cylindric resonators with coaxial Bragg reflectors

Two‐dimensional confined photonic wire resonators – strong light–matter coupling

“…While the single layers and BRs on planar substrates have been investigated by means of standard SE, the curved microstructures with diameters larger 5 µm and the length larger 50 µm, have been investigated by using µ SE. The µ SE technique is divided into two classes, the detection‐focal (DF µ SE) 24 and the confocal (CF µ SE) mode 25.…”

“…This dilute arrangement is very important for the growth as well as for the optical characterization. For preceding investigations of the growth of BRs on curved structures and the development of experimental methods for the investigation of their optical properties, we used concave shaped cylindrical half‐pipes, which are etched into InP substrates 24, and convex circular‐cylindrically shaped glass‐rods as core objects 25.…”

“…As material for our lateral concentric BR we use for the GaAs based nanopillar resonators SiO x ($x = 2 - \delta $ ) and a‐Si (a‐Si: amorphous Si) 26 and for the ZnO based resonators Al 2 O 3 or alternatively MgO and YSZ (YSZ: Yttrium stabilized ZrO 2 ) or ZrO 2 18, 25, 27, 28 as low‐respective high‐index material. These materials are transparent in the relevant spectral range of the band‐gap of GaAs respective the exciton emission in ZnO and their large difference in the refractive index yields large reflectivity values with already a low number of layer pairs, which has been demonstrated for planar BR 18, 25–28. Furthermore, these materials can be deposited as amorphous layers which is important for the growth on curved structures.…”

“…The paper is organized as follows: after a short introduction in the experiential details, the growth and the properties of planar BRs are reviewed shortly in Section 3 18, 25–28. In Section 4 some details of BRs on curved structures, especially circular‐cylindrically shaped glass‐rods with diameters in the range $5 - 5000\,{\rm \mu m}$ are given within the scope of preceding investigations 24, 25, 29. Section 5 finally deals with GaAs and ZnO based nanopillar resonators with coaxial BRs 30, 31.…”

“…In Section 4 some details of BRs on curved structures, especially circular‐cylindrically shaped glass‐rods with diameters in the range $5 - 5000\,{\rm \mu m}$ are given within the scope of preceding investigations 24, 25, 29. Section 5 finally deals with GaAs and ZnO based nanopillar resonators with coaxial BRs 30, 31.…”