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(a) Schematic of the ring-spiral coupled microcavity laser. (b) Scanning electron microscope image of the device.
TE (red solid line) and TM (black dashed line) emission spectra of a single spiral-shaped microlaser. Inset: Plot of the relation between output light intensity and pump energy density.
(a) Laser emission spectrum from a ring-spiral coupled microcavity. The ring diameter is and the cavity is pumped at . Insets: Microscopic photo of the coupled cavity and plot of the output light intensity change vs pump energy density. (b) Single-mode emission spectrum of the same coupled microlaser when pumped at . Inset: Far-field emission pattern of the single-frequency emission.
Single-mode laser emission spectrum from a largely overlapped ring-spiral coupled microcavity. The ring diameter is and the ring-spiral overlap length is . The cavity is pumped at . Insets: Microscopic photo of the cavity and far-field emission pattern of the single-frequency emission.
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