Azimuthal-order variations of surface-roughness-induced mode splitting and scattering loss in high-Q microdisk resonators.
نویسندگان
چکیده
We report an experimental observation of strong variations of quality factor and mode splitting among whispering-gallery modes with the same radial order and different azimuthal orders in a scattering-limited microdisk resonator. A theoretical analysis based on the statistical properties of the surface roughness reveals that mode splittings for different azimuthal orders are uncorrelated, and variations of mode splitting and quality factor among the same radial mode family are possible. Simulation results agree well with the experimental observations.
منابع مشابه
Beyond the Rayleigh scattering limit in high-Q silicon microdisks: theory and experiment.
Using a combination of resist reflow to form a highly circular etch mask pattern and a low-damage plasma dry etch, high-quality-factor silicon optical microdisk resonators are fabricated out of silicon-on-insulator (SOI) wafers. Quality factors as high as Q = 5x10(6) are measured in these microresonators, corresponding to a propagation loss coefficient as small as alpha ~ 0.1 dB/cm. The differe...
متن کاملRayleigh scattering, mode coupling, and optical loss in silicon microdisks
High refractive index contrast optical microdisk resonators fabricated from silicon-on-insulator wafers are studied using an external silica fiber taper waveguide as a wafer-scale optical probe. Measurements performed in the 1500 nm wavelength band show that these silicon microdisks can support whispering-gallery modes with quality factors as high as 5.23105, limited by Rayleigh scattering from...
متن کاملEffects of boundary roughness on a Q-factor of whispering-gallery-mode lasing microdisk cavities
We perform numerical studies of the effect of sidewall imperfections on the resonant state broadening of the optical microdisk cavities for lasing applications. We demonstrate that even small edge roughness (. λ/30) causes a drastic degradation of high-Q whispering gallery (WG) mode resonances reducing their Q-values by many orders of magnitude. At the same time, low-Q WG resonances are rather ...
متن کاملCharacterization of Materials and Mode Structure for High-Q Resonators using Bragg Confined Modes
This paper describes the design and mode structure of resonators using Bragg confined modes. We investigate a range of low-loss dielectric materials with aim to maximize the Q-factor. The structure is composed of a hollow dielectric cylinder with the mode confined in the central low-loss region. We illustrate the importance of material permittivity and show it is possible to obtain a better Q-f...
متن کاملSystematic design and fabrication of high-Q single-mode pulley-coupled planar silicon nitride microdisk resonators at visible wavelengths.
High quality (Q approximately 6 x 10(5)) microdisk resonators are demonstrated in a Si(3)N(4) on SiO(2) platform at 652-660 nm with integrated in-plane wrap-around coupling waveguides to enable critical coupling to specific microdisk radial modes. Selective coupling to the first three radial modes with >20dB suppression of the other radial modes is achieved by controlling the wrap-around wavegu...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Optics letters
دوره 37 9 شماره
صفحات -
تاریخ انتشار 2012