title: Origin of optical losses in gallium arsenide disk whispering gallery resonators.
abstract: Whispering gallery modes in GaAs disk resonators reach half a million of optical quality factor. These high Qs remain still well below the ultimate design limit set by bending losses. Here we investigate the origin of residual optical dissipation in these devices. A Transmission Electron Microscope analysis is combined with an improved Volume Current Method to precisely quantify optical scattering losses by roughness and waviness of the structures, and gauge their importance relative to intrinsic material and radiation losses. The analysis also provides a qualitative description of the surface reconstruction layer, whose optical absorption is then revealed by comparing spectroscopy experiments in air and in different liquids. Other linear and nonlinear optical loss channels in the disks are evaluated likewise. Routes are given to further improve the performances of these miniature GaAs cavities.
authors.forename: David
authors.initials: D
authors.lastname: Parrain
authors.forename: Christophe
authors.initials: C
authors.lastname: Baker
authors.forename: Guillaume
authors.initials: G
authors.lastname: Wang
authors.forename: Biswarup
authors.initials: B
authors.lastname: Guha
authors.forename: Eduardo Gil
authors.initials: EG
authors.lastname: Santos
authors.forename: Aristide
authors.initials: A
authors.lastname: Lemaitre
authors.forename: Pascale
authors.initials: P
authors.lastname: Senellart
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Leo
authors.forename: Sara
authors.initials: S
authors.lastname: Ducci
authors.forename: Ivan
authors.initials: I
authors.lastname: Favero