title: Whispering-gallery modes and light emission from a Si-nanocrystal-based single microdisk resonator.
abstract: We report on visible light emission from Si-nanocrystal based optically active microdisk resonators. The room temperature photoluminescence (PL) from single microdisks shows the characteristic modal structure of whispering-gallery modes. The emission is both TE and TM-polarized in 300 nm thick microdisks, while thinner ones (135 nm) support only TE-like modes. Thinner disks have the advantage to filter out higher order radial mode families, allowing for measuring only the most intense first order modal structure. We reveal subnanometer linewidths and corresponding quality factors as high as 2800, limited by the spectral resolution of the experimental setup. Moreover, we observe a modification of mode linewidth by a factor 13 as a function of pump power. The origin of this effect is attributed to an excited carrier absorption loss mechanism.
authors: Micro-Technology Laboratory, Fondazione Bruno Kessler, Trento, I-38050 Trento, Italy. ghulinyan@fbk.eu
authors: Mher
authors: M
authors: Ghulinyan
authors: Daniel
authors: D
authors: Navarro-Urrios
authors: Alessandro
authors: A
authors: Pitanti
authors: Alberto
authors: A
authors: Lui
authors: Georg
authors: G
authors: Pucker
authors: Lorenzo
authors: L
authors: Pavesi
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008029:Lighting / Q000295:instrumentation*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D036103:Nanotechnology / Q000295:instrumentation*; D012825:Silicon / Q000737:chemistry*; D014159:Transducers; D014732:Vibration
chemical_list: D012825:Silicon