224
7 Structuring Possibilities
Fig. 7.7 a Sketch of a microcavity based on a planar dielectric mirror and a dielectric-mirror coated
fibre tip with concave shape in the core region. b Chemical-etching result. The fibre tip’s core was
selectively etched and a nearly concave shape was produced with visible surface inhomogeneities.
To improve smoothness of this dip, a laser pulse thermal treatment was applied, which resulted
in a very low deviation from an ideal circle (c), as the cross-section (d) and the roughness plot
(e) demonstrated. For details, see [25]. Reproduced with permission. [25] Copyright 2019 AIP
Publishing
Fig. 7.8 Example of a FIB-milled photonic nanostructure with circular in-plane microcavity based
on a Bragg grating, as studied for PL enhancement through improved in- and outcoupling of light
[50] (also see Fig. 2.13). a SEM image. b False-colour AFM topography. (a–b) Adapted with
permission. [50] Copyright 2019 American Chemical Society
7 Structuring Possibilities
Fig. 7.7 a Sketch of a microcavity based on a planar dielectric mirror and a dielectric-mirror coated
fibre tip with concave shape in the core region. b Chemical-etching result. The fibre tip’s core was
selectively etched and a nearly concave shape was produced with visible surface inhomogeneities.
To improve smoothness of this dip, a laser pulse thermal treatment was applied, which resulted
in a very low deviation from an ideal circle (c), as the cross-section (d) and the roughness plot
(e) demonstrated. For details, see [25]. Reproduced with permission. [25] Copyright 2019 AIP
Publishing
Fig. 7.8 Example of a FIB-milled photonic nanostructure with circular in-plane microcavity based
on a Bragg grating, as studied for PL enhancement through improved in- and outcoupling of light
[50] (also see Fig. 2.13). a SEM image. b False-colour AFM topography. (a–b) Adapted with
permission. [50] Copyright 2019 American Chemical Society