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Scanning electron micrograph of circular Bragg grating device. The outer trench was for lateral oxidation of the DBR mirror layers, visible in the lower right corner of the zoom.
(Color) In order of increasing intensity: PL spectra for devices with no grating, a CBG, a hybrid CBG, a CBG, and a CBG. The PL of the CBG was indistinguishable from the PL of a device with no grating. is the number of periods.
(Color) Top: diagram of resonant extracted mode (REM) confined to spacer layer (red), guided modes in the DBR GaAs layers (green), and guided mode in the spacer layer (blue). Mode color scheme is the same for dispersion diagrams (a)–(d), with DBR guided modes omitted for clarity. (a) Dispersion diagram of unpatterned device showing nonresonant radiation mode (NRRM) continuum above light line shaded in yellow. [(b)–(d)] First Brillouin zones for CBG periodicities of 180, 360, and . Horizontal dotted lines bound the experimental frequency range. Light emitted in shaded region between horizontal dotted lines is extracted and collected.
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